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  #1  
Old 12-21-2011, 02:06 PM
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Smile CC's to Horsepower

HI,
I am trying to fing the convertion of CC's vs the horsepower. When I say CC i mean cubit Inches power. Like a small engines are in cc's so how many cc's are in a horsepower?

Thanks,

Unnamed
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  #2  
Old 12-21-2011, 04:08 PM
HerrWarum HerrWarum is offline
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Default Re: CC's to Horsepower

First, squeeze as much info out of this
http://www.ajdesigner.com/phpengine/...lacement_b.php
as you can.

For car engines the displacement and hp are published so you can make a graph and fit a straight line using Excel. The more cars you graph the more accurate the line.

For small engines you may have trouble finding this info.
http://www.ehow.com/how_6574472_conv...orsepower.html

Since hp = TQ x RPM/5252 and gas/diesel engines vs motors have different speed/torque curves it might be better to ask 'What TQ and RPM do you need?'.

Maybe this is why it's so hard to nail down this equivalence.
But I do think that with enough data some equivalence can be found in a statistical sense but the correlation may be weak.

I can't seem to let this question go.
If you have a variable speed application then the area under the torque/speed curve will give you the average hp for a motor or an engine.
For a fixed speed application compare the torque for each at that fixed speed and then use the formula above.

"Ask and ye' shall receive!"
http://www.simetric.co.uk/si_cc2hp.htm
With the list of cc, hp and rpm shown you can use Excel to calculate correlations between pairs of these, three pairs in all.
But, there are many ways to slice and dice these data, depending on your goal.

Last edited by HerrWarum; 12-23-2011 at 11:19 AM.
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Old 01-06-2012, 01:00 PM
HerrWarum HerrWarum is offline
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Default Re: CC's to Horsepower

For marine outboards only, the correlation between cc and hp is 0.988 and the formula is
cc =
19.1
times
hp
plus
55.0

Last edited by HerrWarum; 01-06-2012 at 01:39 PM.
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  #4  
Old 01-06-2012, 02:53 PM
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Robert Fogt Robert Fogt is offline
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Default Re: CC's to Horsepower

Quote:
Originally Posted by Unregistered View Post
When I say CC i mean cubit Inches power
To be picky, cc stands for cubic centimeter not cubic inch.
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Old 01-18-2012, 01:51 PM
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Default Re: CC's to Horsepower

all the articles had horsepower to CC at around 25/30 CC's to 1 HP. Seems like alot but I went to a small engine webpage.So there it is for what it's worth.
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