PDA

View Full Version : How to covert CC to horsepower

Unregistered
01-27-2006, 10:54 AM
Im having trouble finding a site that can convert CC into horsepower. I was wondering if you knew how to change 246 cc into h/p somehow.

Robert Fogt
01-28-2006, 12:10 AM
About the only way would be to take it to a shop and have it put on a machine to measure it.

Horsepower depends on much more than just engine size. For example, a well tuned up 246 cc engine will have more horsepower then an old one. There are too many other factors for converting directly.

If it is a new engine then I am sure you can find data sheets for it someplace, such as the dealers website. You are sure to find both engine size and horsepower listed there.

Unregistered
02-21-2006, 05:13 PM
Do you what the "CC's" [as in a 250 cc motorcycle engine] are for a 15 horsepower Briggs and Stratton engine?

Or cubic inches [as chevy 350 cubic inch engine] would be in CC's [as in 500 cc Yamaha]? Please.

Thanks

Gary

Robert Fogt
02-22-2006, 04:28 PM
The symbol cc stands for cubic centimeter, while the symbol ci stands for cubic inches.

Both are units of volume and you can convert between them on the Volume conversion page. Another common unit of volume for engine size is the liter.

You cant directly convert volume to horsepower. But in your case, you have a 15 horsepower Briggs and Stratton engine, you'll just need to know the year it was made, then contact the Briggs and Stratton company and they will be able to tell you. Possibly a dealer could help too, maybe even their website will have that information.

Unregistered
03-09-2006, 05:41 PM
Im having trouble finding a site that can convert CC into horsepower. I was wondering if you knew how to change 246 cc into h/p somehow.
i would like to convert 988cc in to horse power

old man
05-03-2006, 06:06 PM
O that is as easy as pie all of you people are wrong you certanly can convert cc in to horse power just by taking the first numer and taking 1 away so for instance 988 cc would be 98 horse powere easy as that. I am seventy four and I know my stuff. But if it was 49 cc you would take two away and take away the 9 for good so it would be 2 horse power.

Robert Fogt
05-04-2006, 03:54 AM
I'm not sure that would be very accurate. A cheap 100 cc engine would certainly have lower horsepower than a brand new high performance 100 cc engine.

Though no doubt there are rules of thumb that are accurate enough for most purposes.

whiteboy4rd
05-18-2006, 07:29 PM
"old man" i still dont quite understand if a car (skyline) had 3500cc what would it be in hourse power?

Unregistered
06-05-2006, 04:05 AM
Roughly 250 HP on 3500 CC Skyline. Alot of factors can make that number different though. But it's a rough estimate if that is what you want.

Unregistered
06-05-2006, 04:09 AM
Roughly 250 HP on 3500 CC Skyline. Alot of factors can make that number different though. Like where the torque is....Shaft or Rear Wheel, and it can also depend on the tune....it can go up or down drastically. Ford Mustangs are roughly 193 HP at around 3800cc's.

But again, it's a rough estimate if that is what you want.

Unregistered
06-05-2006, 04:12 AM
Roughly 250 HP on 3500 CC Skyline. Alot of factors can make that number different though. Like where the torque is....Shaft or Rear Wheel, and it can also depend on the tune....it can go up or down drastically. Ford Mustangs are roughly 193 HP at around 3800cc's. But you can add a chip, better exhaust, turbo, or supercharger, still have 3800cc's and run your HP up to 750 R.W. HP.

But again, it's a rough estimate if that is what you want.

Unregistered
06-24-2006, 03:06 AM
Im having trouble finding a site that can convert CC into horsepower. I was wondering if you knew how to change 246 cc into h/p somehow.
4000 cc convert to horsepower

Unregistered
07-07-2006, 03:40 PM
how to find difference between cc and hp like 100cc = to how much hp i want to know plz anyone tell me .

Robert Fogt
07-08-2006, 05:54 AM
There is no conversion. It depends on too many factors to directly convert between engine volume size and horsepower.

If its a new engine, you should have no problem finding the rated horsepower and volume information online from the manufacturer. Otherwise you would need to take the engine to a shop and have it measured.

Pokey
08-06-2006, 01:05 AM
Anyone who says they can convert volume to power has no idea what they are talking about. These are not just different units, they are measurements of completely different things. It's like asking how to convert 5 minutes into a certain volume of elephant dung. Yeah, sure, elephant dung can be shoveled over a period of five minutes, but you can't convert one to the other. Any given 5.7 liter V8, for example, makes different amounts of power depending on the throttle position and the revolutions per minute, ect. And that's not to mention that some 5.7L engines will make a maximum of less than 200hp and others will make well over 2000hp. The idea that a given displacement would have a certain set amount of power that it would create is absolutely rediculous.

78 f150 460
09-01-2006, 11:58 AM
I have a stock 460 in my 78 f150. Could you tell me what the horsepower is?

Robert Fogt
09-03-2006, 02:00 AM
I found some information on old Ford engines here:

Unregistered
09-03-2006, 01:17 PM
CC's and Horsepower are like apples and oranges. CC's are a unit of volume and horsepower is a calculation of work load. Only a dyno would be able to tell how much horsepower a given displacement will/would make.
RW

Robert Fogt
09-04-2006, 06:10 AM
Yeah, but it doesn't really matter how many times someone says that, as people will continue to ask.

Funny how you used the apples to oranges comparison. That's what I based the OnlineConversion.com logo off of.:D

Unregistered
11-21-2006, 01:37 PM
Im having trouble finding a site that can convert CC into horsepower. I was wondering if you knew how to change 246 cc into h/p somehow.you divide the 246cc by 15!!!

asif
12-22-2006, 07:15 AM
How to calculate hp of an engine when its bore size and length of stroke are given. The units are cm.

How to convert cc of engine to hp.

Robert Fogt
12-27-2006, 06:03 AM
You cant calculate the horsepower, only measure it.

There are too many variables to calculate the horsepower. Though many people have posted estimates.

I was sent a formula for calculating the CID of an engine based on bore and stroke, in inches.
bore x bore x stroke x .7854 x number of cylinders = total CID

Have not yet been able to verify it though.

Unregistered
01-14-2007, 08:46 PM
ok the person that started the thread im guessing you are asking how many CCs you suzuki z250 has well I would have to say about 14 hp Dyno test it if you want exact numbers

Unregistered
01-22-2007, 06:22 PM
hi what would 11 horspower be in ccs thx

hmayur
01-28-2007, 12:13 AM
i would like to convert 988cc in to horse power

gubment_cheez
01-28-2007, 07:50 PM
There is no conversion. It depends on too many factors to directly convert between engine volume size and horsepower.

If its a new engine, you should have no problem finding the rated horsepower and volume information online from the manufacturer. Otherwise you would need to take the engine to a shop and have it measured.

thaneshonline@yahoo.co.in
03-02-2007, 12:40 PM
Im having trouble finding a site that can convert CC into horsepower. I was wondering if you knew how to change 246 cc into h/p somehow.
please let me know how to calculate the horse power of a 100cc engine

Unregistered
03-13-2007, 07:58 AM
[how to convert a 173 cc lawn mower engine into Hp

Robert Fogt
03-14-2007, 03:57 PM
You cant calculate it, only measure it.

Though you can probably visit the manufacturers website and find out the horsepower of a new and well tuned one. After the engine gets old and components get worn the hp will lower.

Ron
04-02-2007, 09:45 AM
I have a 1100cc motorcycle I would like to figure out horsepower

jibran
04-09-2007, 10:48 PM
Im having trouble finding a site that can convert CC into horsepower. I was wondering if you knew how to change 246 cc into h/p somehow.
plz tell me the method how to convert cc to hp

Unregistered
04-10-2007, 07:07 AM
4000 cc convert to horsepower
i have a 173 cc lawn mower engine,roughly how much h.p. is that?

Robert Fogt
04-10-2007, 05:28 PM
i have a 173 cc lawn mower engine,roughly how much h.p. is that?

If you know what brand, model, and age, it may be posted on the manufactures web site. Otherwise you have to hook it up to a scope to measure it. There is no engine volume to horsepower conversion.

Unregistered
04-14-2007, 07:30 PM
you know you can always go online to the dealers to find out or google the question. Call a local dyno shop to see if they know, or even you take the bike itself to it to find out how much it has. My buddy is in the process of buying a dyno for small vehicles ( ATV's, Moto's, and some cars ) so we can test the theories of conversions. It does depend on octane fuel used, oil, last maintanece, and even what temperature it is where you test it. COLDDER IS BETTER. GET COLD AIR KITS FROM K & M FOR MORE H.P. AND torgue

Unregistered
04-18-2007, 12:58 PM
"How do I convert CC to horsepower?"

Multiply the CC by what is called "specific output" (power per volume displacement), in the unit of hp/cc. Factor label works out to give you a number in the unit "hp" which is what you want.

Now the question is, how do you get the specific output in hp/cc ? It's easier to just find the horsepower, since it is usually advertised widely. hp/cc or hp/L is harder to find that just finding the horsepower rating from the manufacturer to begin with. If you can't find the horsepower, you're not going to be able to find the specific output.

So, there is no practical reason to try to convert CC to horsepower. The question isn't nonsensical outright, it just isn't the best way to try to find horsepower. There is no one constant you can use to convert if you have no other information, like specific output, rpm limit, etc.

For example, Subaru makes several versions of a 2.5 L engine. They make 170, 235, and 300hp. All the same CC size, but the highest power model makes almost double the power of the lowest! Same manufacturer. The most powerful of those two engines are actually identical as well, same pistons, heads, and block.

So go back the original question and reanalyze what the answer should be:
"How do I convert CC to horsepower?"

The best answer is that you're wasting your time. You either need to trust the manufacturer's rating, or test it yourself with a dynamometer. You cannot just tell by CC alone how much a motor will make. There is no one multiplier factor.

It's like asking how many gallons a lake holds only knowing the surface area. You also need to know other things, like average depth. Or asking how many watts a light bulb uses only knowing the voltage, but not current or resistance. You have not supplied enough information about the situation.

Unregistered
04-18-2007, 09:30 PM
I have a Honda 500 Foreman 4x4 four wheeler and it has 475c.c. How many horsepower is that?

Robert Fogt
04-19-2007, 06:09 PM
Read through the previous 4 pages of replies here. I just dont think it could be explained any better than it already has.

Unregistered
04-24-2007, 09:41 PM
quick and easy not accurate but close considering all the factors. so 15-17 cc= 1 hp. I hope this helps. Have a good day!

Unregistered
04-25-2007, 12:09 AM
[My Scooter is 49.6 cc. I want to know the hourse power of my scooter.

Unregistered
04-29-2007, 12:50 AM
I Don't Know How Any Of You Figure Hp To Cc But I Have A 789cc Onan Twin Cylinder Engine That Was On An Mtd Garden Tractor And It Is Rated At 20 Hp So If You Divide 789 By 20 You Get 39.45 Cc Per 1-hp The Way I Figured It. This Might Not Be Right But Thats How I Did It And It Seems To Be Accurate As I Was Buying Another Onan Engine That Was 274.4 Cc's No Hp Listed I Guessed It To Be About A 7 Hp Engine When I Got Home I Figured It This Same Way And It Came Out To 6.955640050697084917617237008872 Thats Damn Close To 7 Hp Boy's!!! I Belive My Way Is Pretty Damn Accurate....but What Do I Know I'm Just A Farm Boy Not A Rocket Scientist LIKE ALL OF YOU!!!!

Unregistered
05-02-2007, 04:27 AM
Thanks for the gut check. now I see why they don't directly convert. I have the same root questions as well, but know now to look for HP as the common measure. In my case, I am window shopping for go-karts for my son and I. Some are 6 HP, some 9 HP, then someone comes along and claims 150CC! I too was trying to be able to just whip out a formula to compare models with as I shopped, guess HP ratings will have to do it. Thanks for the detailed explanation!

Unregistered
05-02-2007, 05:09 PM
convert american dollars to maltese lira

Unregistered
05-07-2007, 06:22 PM
each cc is about 16.387064 so divide your total cc by 16.387064 to determine close to what the hp is

Unregistered- CHIP
05-12-2007, 09:16 PM
Pokey Is Right. I Mean You Change A Jet In A Carb And Increase Air And/or Fuel Intake And Horsepower Will Change. A 350 Ci Chevy Built In The 1983 May Have Produced 145 Hp And A 350 Ci In A Late Model Corvette May Develop 400 - 500 Hp. In The 60`s There Was The 327 At Around 275-300 Hp And You Could Get A 327 In Some Cars With 350 And 375 Hp. Bigger Valves, Exhaust And Fuel Delivery Are All Determining Factors,

Unregistered
05-16-2007, 11:05 AM
"old man" i still dont quite understand if a car (skyline) had 3500cc what would it be in hourse power?
it would be 350 horsepower duh all u do is take the last number of the CC off and u got the number of h/p

Robert Fogt
05-17-2007, 01:42 AM
it would be 350 horsepower duh all u do is take the last number of the CC off and u got the number of h/p

No, that will not work. That would mean a 350 chevy engine (5735 cc) would have 574 horsepower.

Unregistered
05-18-2007, 02:30 AM
You cant calculate the horsepower, only measure it.

There are too many variables to calculate the horsepower. Though many people have posted estimates.

I was sent a formula for calculating the CID of an engine based on bore and stroke, in inches.
bore x bore x stroke x .7854 x number of cylinders = total CID

Have not yet been able to verify it though.

THIS RULE OF THUMB IS WIDELY SHOW IN PERFOMANCE OF A DODGE VIPER VS MERCIELAGO LAMBERGINI ON A 1\4 MILE TRACK, THE VIPER HAS 500HP AND THE LAMBO HAS HP640. NOT TO MENTION TOP SPEED BUT THATS A DIFFERENT MATTER.

Unregistered
05-18-2007, 04:21 PM
Im having trouble finding a site that can convert CC into horsepower. I was wondering if you knew how to change 246 cc into h/p somehow.

YOU TAKE 16.39 MULTIPLY BY ENGINE SIZE AND IT WILL EQUAL CC

EXAMPLE 107" MOTOR X 16.39 = 1753.73 YOU WOULD THEN ROUND OFF

A 107 ENGINE = 1754 CC

AND I AM A GIRL!

Honda Guy
05-21-2007, 06:25 PM
I have a Brand new Honda CRF 100. I have done nothing to the engine since I bought it 2 Days ago. Can anybody tell me what the Horsepower is????

Thanks

Robert Fogt
05-22-2007, 03:33 AM
I have a Brand new Honda CRF 100. I have done nothing to the engine since I bought it 2 Days ago. Can anybody tell me what the Horsepower is????

Thanks

I checked the Honda website and even they dont list it.

Click on specifications, thats all the data I would know how to find.

Unregistered
05-31-2007, 05:13 PM
YOU TAKE 16.39 MULTIPLY BY ENGINE SIZE AND IT WILL EQUAL CC

EXAMPLE 107" MOTOR X 16.39 = 1753.73 YOU WOULD THEN ROUND OFF

A 107 ENGINE = 1754 CC

AND I AM A GIRL!A couple of things real quick:

a.) this does not answer the OP's question of cc to hp conversion (as this is impossible), and b.) your conversion of cubic inch to cubic centimeter might have be better understandable if you said 'ci'' instead of '"' (as in '107 ci = 1754 cc') when referring to cubic inches, but whatever, perhaps I'm just being pedantic.

Unregistered
06-03-2007, 10:42 AM
Very helpful discussion for my in spite of trying to do the 'impossible'. Im chossing between a 3 HP electrice chain saw, and a 40cc gas saw, as a back up tool The price differential is over a hundred dollars, and Now I don't think it worth it, as it is a back up. I liked the eye ball 15-17 mulitplier, ( as in 16.39) I'm just a guy, but I see nothing wrong with pedantry. :) thank you all.

me hear
06-05-2007, 04:00 PM
form what i have read on this topic. and what i wont to know is my go-ped is from the 50' im trying to find rings for it. the motor is a 50 or 55 cc engine, witch happens to be close to the piston size of a weedeater or a chainsaw. the measurments for theis type of motors are in horsepower. by using the horsepower calculations i can find the write piston size of a small engine for my ring replacement since they do not make after market parts for a Benelli 250D from the 1955

Unregistered
06-11-2007, 05:36 PM
There are many verables that determine Horse Power. You may have two identical engines that put out different horse power. It is determined by displacement, Compression Ratio, Fuel mixture, engine design, ignition and valve timing.
Horse Power or (BHP) 1BHP = 550 FtLb per second
Example: For Calculating FtLb
Work= Distance X Force (5Ft X 10Lb = 50FtLb)
Power= Work / Time (50FtLb / 2 seconds = 25 Foot Pounds per Second)

If you want to figure out CC for an engine you use

Displacement= Bore X Bore X 0.7854 X Stroke, X number of cylenders
Example 5.4(Bore) X 5.4(Bore) X 0.7854(Constant) X 5.4(Stroke) X 1(number of cylenders) = 123.672 CC
and if you need to convert CI to CC (1 CI = 16.387 CC)

That being said the best way to get an accurate HP is to put your vehicle on a Dyno or call the manufacture.
Just trying to provide some food for thought.
Have a good day.

Unregistered
06-14-2007, 02:48 PM
i have a 173 cc lawn mower engine,roughly how much h.p. is that?
about 17 0r 18in that area

cmck
06-24-2007, 06:39 AM
Use cc'c divided by 42.3 and it would give you the app. Hp. For instance a 148 cc lawn mower at a store is equivlant to a 3.5 Hp, engine . and a 1.73 cc app. 4hp. Still don't use this as a rule on used engines , they loose hp as used. This is just a calculation to give you the basics . in the perfect world

biodboy
06-28-2007, 07:34 AM
Hello,
This may be a new thread, but my question involves what may be a more accurate horsepower rating for military standard engines? For example the 4A032-4 Military Standard engine produced by Teledyne is listed as a 6 hp. engine. But the thing has 525 cc's. A 4-stroke motorcycle engine of this size may create between 30 and 40 hp. The Military is known for under-rating these Mil. Std. engines, but I need to know what a realistic or real world Hp. rating might be.
Thanks.
Biodboy

Robert Fogt
06-28-2007, 11:13 AM
The military spec may measure the horsepower at a specific RPM. Depending on the RPM you would have greatly different horsepower output. For example, a diesel engine can produce greater horsepower at low RPMs then a gasoline engine.

The Honda 499 cc racing engine has a bit over 200 horsepower.

Though realistically its just not a good idea to try and estimate horsepower based strictly on engine size. They are just not related enough.

08-06-2007, 03:13 PM
if you have a 1000 cc engine and say you have 100 hp. what if you have a 1000 ccc engine and put a turbo on it? or a cam? or a bigger carb? You have more horsepower but the same 1000 cc motor. If you want to find the hp of an engine you have what I do is go too google and type in the engine brand and cc size and model. then also put hp for the search word too. This will usually direct you to a site that will tell you.

Unregistered
08-24-2007, 11:59 AM
There Is A Way You Can Calculate Cc's To Hp But Since It Depends On The Parts The Motor Has You Will Have To Find Out Your Engine Parts Specs. There Are A Couple Of Programs Performance Trends Makes That Will Get You Within 3 Hp Of Your Accurate Power. But Using The Performance Trends Programs Are Very Difficult And You Must Know Alot About Engines. So You Can Mess Around With A Free Program, Or Spend Up \$500 At A Shop With A Dinomometer.

Unregistered
08-26-2007, 07:44 PM
Hello everyone...

Couldn't help but notice that there is a fair amount of confusion regarding calculating HorsePower...

IT CANNOT BE CALCULATED ON THE BASIS OF CCs.... PERIOD

(4 stroke mower engines are similar... Motorbikes vary widely... cars vary widely...)

I have owned all of the engines below and they each have vastly different horsepower to cc ratios (with the exception of the two small engines);

5hp Techumsec Mower (207cc)
11hp Briggs and Stratton Ride on Mower (400cc)
27+hp Honda CR250 Motorbike (250cc) (2-stroke)
78hp Kawasaki GPZ750 Motorbike (750cc)
175hp Ford Falcon car (4200cc)

All the best - Sam

Unregistered
09-09-2007, 10:09 PM
How much hp for 125 S.E. Kawasaki motorcycle?

Unregistered
09-10-2007, 09:14 PM
Here's my take on all the figures presented so far:
to APPROXIMATE a measure of horsepower, based on knowledge of CC:

perfect (eg racecar, airoplane) quality equipment:
divide CC's by approx 6-10

new/performance (eg new motorcycle ) equipment:
divide CC's by approx 10-12

good quality equipment (eg old motorcycle, new sports car):
divide CC's by approx 12-15

fair quality equipment (eg very old motorcycle, any other car):
divide CC's by approx 15-20

sound right?

Unregistered
09-22-2007, 05:02 AM
Previous post has the right idea - compare like with like.

This site has a list of piston engines showing capacity and horsepower from a 2.5cc model aero engine to a 1.5 million cu.in. ships engine.

To go to the site just Google for 'cc to hp' (can't put a link)

It gives the ratio of horsepower to cc so pick the type you want (Briggs and Stratton or outboard or chain saw or Ford pickup, etc) and apply that to your known cc or cu.in.

Gives a 'near enough' estimate.

thesmartfisherman.com
09-26-2007, 08:16 PM
Holy Schmolly I say.

I am suprized that no one tried this sooner.

To the guy that thinks tis can be done:

I have a motor that I know is 50 HP. Please tell me the displacement in ccs.

Unregistered
10-13-2007, 02:57 AM
I am trying to find out how much horsepower in a 305cc craftsman snowblower, I was at a local Canadian tire store the other day and I was looking at a couple of snowblowers...one was 318cc and 9 hp, the other was 318cc and 11 hp....whats up with that?????????

Unregistered
11-15-2007, 11:24 AM
I saw a honda engine at 189 cc, now dont tell me thats 18 horse power cos I wont believe it, its for a pressure washer and the engine is no more than 6 horse power so how can 189cc be 6 hp?

Unregistered
11-15-2007, 10:27 PM
Im having trouble finding a site that can convert CC into horsepower. I was wondering if you knew how to change 246 cc into h/p somehow.

first
horsepower = force * distance by "in how much time".
Force = mass * acceleration

I know what your thinking, that if a certain amount of CC( CI), let say 100, should give you a certain amount of horsepower, always right? will not right, your confused on terminalogy. You alreade know how much power you got, that is, 100cc. "Now" horsepower is a measured in how much distance it can be moved in how much time.

[Ex1] if you have 1000cc and the lat say, ATV weights 500lbs, you going to have alot of horsepower.
[Ex2} Again, let say you have 1000cc, but let say you ATV weight 500tons, your you bike doesn't have alot of horsepower. But it does have alot of POWER.
Power = Work * time
horsepower = work* time* distance
Distance is the keyword in horsepower, if it doesn't have to much, it basically mean it doesn't have alot of horses.

Still confused? remember, when the engine was built, it was suppose to replace horses, back in the 1900. So if you got 1000CC and it weight 500Mtons, it won't move right, so therefore , you won't even have one horsepower. But no dought, you got a big engine.

Unregistered
11-16-2007, 11:13 PM
Is this some kind of psychology experiment? It's SO obvious. Asking to convert one of these into the other is like asking how much alcohol a glass can hold without saying what kind of drink or how full.

cc is a measure of volume. 30 cc is something like one fluid ounce or a couple of cubic inches.

A 2 stroke 10cc model airplane engine running 10% nitro on a tuned pipe might make upwards of 2 horsepower. (And I think it's about 1/3 to 1/6 the displacement of a shot glass, to stretch the metaphor.)

Two strokes DO tend to put out more power per displacemtne. I said TEND.

The aforementioned industrial engine is, I think, something like 524cc, but it only puts out 6hp as originally set up. But it probably puts that out reliably for 100 to 1000 times the life of that model airplane engine.

Those two snowblowers were probably set up just a bit different. Change the carburator a bit, fiddle with the head, whatever, you make a change in the horsepower available.

So forget the conversion, do your homework and find out the real number.

11-19-2007, 11:30 AM
There are many verables that determine Horse Power. You may have two identical engines that put out different horse power. It is determined by displacement, Compression Ratio, Fuel mixture, engine design, ignition and valve timing.
Horse Power or (BHP) 1BHP = 550 FtLb per second
Example: For Calculating FtLb
Work= Distance X Force (5Ft X 10Lb = 50FtLb)
Power= Work / Time (50FtLb / 2 seconds = 25 Foot Pounds per Second)

If you want to figure out CC for an engine you use

Displacement= Bore X Bore X 0.7854 X Stroke, X number of cylenders
Example 5.4(Bore) X 5.4(Bore) X 0.7854(Constant) X 5.4(Stroke) X 1(number of cylenders) = 123.672 CC
and if you need to convert CI to CC (1 CI = 16.387 CC)

That being said the best way to get an accurate HP is to put your vehicle on a Dyno or call the manufacture.
Just trying to provide some food for thought.
Have a good day.

I could not have said it any better myself.

The Yamaha YZ250F is rated at 32 horsepower (give or take) and If memory serves me around 20 foot pounds of torque. Not bad for a 4 stroke, single cylinder dirtbike.

Displacement is only part of the equation for making power. There are more factors to take into account, numerous factors that would probably fill this post to the brim but I wont.

It is improbable to calculate an engine's power purely based on the size of the engine.

Believe me when I say this, outer appearances are deceiving, you have to actually test what something can do before you make assumptions.

Is this some kind of psychology experiment? It's SO obvious. Asking to convert one of these into the other is like asking how much alcohol a glass can hold without saying what kind of drink or how full.

cc is a measure of volume. 30 cc is something like one fluid ounce or a couple of cubic inches.

A 2 stroke 10cc model airplane engine running 10% nitro on a tuned pipe might make upwards of 2 horsepower. (And I think it's about 1/3 to 1/6 the displacement of a shot glass, to stretch the metaphor.)

Two strokes DO tend to put out more power per displacemtne. I said TEND.

The aforementioned industrial engine is, I think, something like 524cc, but it only puts out 6hp as originally set up. But it probably puts that out reliably for 100 to 1000 times the life of that model airplane engine.

Those two snowblowers were probably set up just a bit different. Change the carburator a bit, fiddle with the head, whatever, you make a change in the horsepower available.

So forget the conversion, do your homework and find out the real number.

I have an OS .12 TZ engine and it is rated at 1.5 HP from the factory (at 30,000 RPM).
2 stroke engines produce more power per size than their 4 stroke counterparts but the difference is at the RPM they make it at. 4 strokes make more power off the bat, 2 strokes make it in the upper RPM ranges

Unregistered
11-22-2007, 05:20 AM
how do i convert litre engine into cc

Leopold Plumtree
11-22-2007, 01:33 PM
how do i convert litre engine into cc

1000 cc per litre.

Unregistered
01-07-2008, 01:12 PM
horse power can vary on temperature and weather conditions as well as anything else added to the engine. Turbo chargers, super chargers, an engine will put out more horsepower when it's warmed up and when the air going into it has less moisture and is a cooler temperature.

when a company labels an engine for horsepower they're taking the optimum horsepower of a base test model.

JohnS
01-08-2008, 04:57 AM
I was sent a formula for calculating the CID of an engine based on bore and stroke, in inches.
bore x bore x stroke x .7854 x number of cylinders = total CID

Have not yet been able to verify it though.

The formula is correct, the constant represents pi/4. You are computing the volume of N cylinders - pun intended.

Displacement is the volume swept by the pistons per revolution. The small residual combustion chamber volume above the piston at top dead center is ignored.

If bore and stroke are given in cm, the same formula gives displacement in cm^3. Divide by 1000 for liters.

Agree with all comments that there is no accurate way to go from displacement to horsepower, but there are typical figures or figures of merit. However, merit depends on purpose. Getting the last horsepower out of a race engine for 5 five hours is quite different from a truck engine expected to last 500,000 miles. Once you identify purpose, you can decide on technology and money to spend. These different classes of service will use engines with different power/displacement ratios. In general, if more power is available and actually used, engine life will be shorter.

Unregistered
04-18-2008, 08:39 AM
Im having trouble finding a site that can convert CC into horsepower. I was wondering if you knew how to change 246 cc into h/p somehow.
As a standard rule you can use 5hp= 1cc.

Unregistered
07-01-2008, 04:19 PM
Displacement technically has nothing to do with horsepower, but a bigger motor usually makes more horsepower. And whoever said a SKyline makes 250 horsepower must know nothing at all about cars. Cars make less horsepower compared to displacement because they can't physically rev as high. Also, a Skyline is a 3500cc TURBO motor. This means it can have much more horsepower than a naturally aspirated engine could have. I think they make about 293-300 hp stock. Older models range from 276-280. Could people learn about things before answering questions or asking them? This whole thread is pointless since it is impossible to convert volume into power. You can guess the neighborhood of a motor by looking at it's displacement. 1000cc may produce between 70hp on an old mistreated bike, or up to 100hp on a newer, well maintained one. But other factors like gas, cylinders, timing, exhaust, performance/ economy tuning... they go on forever and this makes it almost impossible to do this.

Unregistered
07-26-2008, 07:48 PM
Wow, this should make it clear my 1976 chevy truck had a 5700 L @ 155 hp and my 2007 has a 5300 L @ 315 hp my 1969 had 5300 L with 400 hp
You need to check the oem or get it on a dyno.

Unregistered
09-19-2008, 01:49 AM
Ok guys... First off I'm convinced this entire thread is a joke... I mean how did this question go on for 2 or so years. but i'm bored and i just had to say acouple things. (i havent read the entire thread so if i say things that were already said which i kno i'm going to... sorry)

First answering the question 4 the millionth time in this forum.
cc (cubic centimeters) is displacement. its the max fuel/air the engine could hold. It a way of determining size of the engine not power. There are many other factors that are involved that would skew any estimates on a power rating according to size. examples(compresion, different bore/stroke sizes, better flowing intake, less restrictive exhuast, different valve timing) all of this would make it impossible to calculate a power from just an engines size.

So who ever keeps asking... its not really possible to convert cc's into hp (its like me asking you how much can a guy bench press if he has a bicep 8 inches around... theres just more to it then that) just look up the engine and the company that manufactured it. They should have statisics about the engine. hell if u knew the engine code u could probly get credible info on wikipedia.

if your not a nissan fan/tuner stop here....

Next... The skyline... wat skyline are u talking about that has a 3.5l engine? I assume the v35. but not many people in the states consider the v35 a real skyline. In the US the v35 was marketed as the infinite G35. it had the same engine as the nissan 350z. That 3.5l (3500cc for thoughs confused that i'm using litters now) makes about 280hp. Someone said it was a turboed engine... the engine used 4 the 350z, G35, and skyline was called the vq35de. Well the point is its not turboed... Who ever said that you were probly thinking of the earlier skyline (r32, r33, and of course the all popular r34). They had the engines in nissans RB family and most of them r turboed. but the largest of those was the rb26dett. That is a 2.6l or 2600cc twin turboed engine that makes 280hp.

Sorry for dragging on... but it just bothered me...

Unregistered
10-02-2008, 06:36 AM
The short answer is about 15 to 17cc = 1 hp or about 1 cu.in. = 1 bhp for a modern car.

The full answer is complex - the power output of an engine depends on the state of tune as well as size, and the definition of horsepower must be considered, brake horsepower ( bhp ) or shaft horsepower ( shp ), and is not covered here.
Horsepower can be increased by engine tuning, more volatile fuel, supercharging or exhaust turbo boosting.

Unregistered
10-06-2008, 04:44 PM
i have a list of lawn mower conversion at my work:

2006-2007 lawn mower model

148cc = 4 to 4.5 hp
173cc = 6.5 hp
160cc = 5 to 5.5 hp
179cc = 6 to 7 hp

these are not precise conversion. Just a hint

Unregistered
10-31-2008, 05:56 AM
I need to know how to convert CC's into Horsepower too.

Now Snow throwers from Sears are made with Craftsman Engine which are made by MTDs. These engines are rated in CC's and not horsepower anymore. Don't understand the need for this things. A couple of years back Briggs and Stratton did the same thing with their smaller engines in Lawn Mowers and converted Horsepowers into CC's.

Basically Snow throwers have the following ratings:

123 CC (for the lightest snow)
179 CC (For medium snow)
250 CC and Above (for heavy snow).

How much is 123 CC equal too? Last year Craftsman had a similar Snow thrower for 4 HP which had the same features as 123 CC. So I am assuming its pretty much the same power, except that it is now made in CCs. 179 CC snow thrower was equivalent to 5 HP and 5.5 HP last year and 250 CC was equivalent to around 7 HP and above. So I am not sure how to convert CCs into HP. In fact, more CC's mean more Horsepower because the more volume is displayed by the pistons, the more faster its going to complete one revolution resulting into more power.

However, in Lawn mowers they are made of 190 CC or 6.75 Torque (they have two ratings) by B&S. These lawn mowers were equivalent to 6.0 HP and 8.75 Torque with 190 CC was around 7 HP. So I am confused now. What is the exact method of converting CCs into horsepower.

Unregistered
10-31-2008, 08:24 AM
This is insane, I love it! Horsepower is the direct result of just how much air/fuel you can cram into the cylinders and get reliable, efficient combustion short of having raw gas drip out the tail pipe. Take any engine and increase valve lift with a differnt cam and you get more power; same with a bigger (or better carb) bigger valves...the list goes on but this can be done without changing the "CC" or cubic inch one bit. It's just physics, more gas and air, bigger boom, more power. I say if it can move your *** without straining, it has enough horsepower. Be happy.

Unregistered
11-05-2008, 07:40 AM
FYI only.
cc's are as expressed in cubic centimeters. This only refers to the displacement of the piston to it's sleeve in the power plant and not related to h.p. The variables are to numerous to mention the different hp's available for the same displacement size. However if you know the kw of the engine or other power plant you can convert directly to hp. .746kw is equal 1 hp.
ex. if you have 8.110kw and you divide by .746you would have a 10.87 hp.
hope this helps.

kawasaki zxr 400 cc
02-16-2009, 08:20 AM
i would like to convert 988cc in to horse power
400 cc = hw much bhp plz ?

Unregistered
03-14-2009, 04:33 PM
litre to cc is 1litre =1000cc, thats all you can figure out
like mentioned before cc (cubic centimeters)is engine size not torque or hp. In lameman terms the bigger the piston the more hp, and usually big engines have big pistons, which means bigger valves etc. The bigger and hotter the explosion the more power.

Robert Fogt
03-19-2009, 04:08 PM
This thread seems to have been beaten to death so I am going to close it.