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Anonymous Poster

Convertion

08/29/2007 2:43 AM

How can I convert a CC (motor cycle 125 cc) into horse power?

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#1

Re: convertion

08/29/2007 2:54 AM

You can't.

There is no direct correlation, it depends on the efficiecy.

A 50cc engine may produce more HP than a 150cc one, although it would probably wear out quicker!

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#2

Re: convertion

08/29/2007 3:07 AM

I agree with Del. You're gonna need to know the efficiency of combustion to get a mathematical correlation between the engine volume (cc) and its output power (HP)

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#3

Re: convertion

08/29/2007 3:32 AM
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#4
In reply to #3

Re: convertion

08/29/2007 6:59 AM

Thank you very much.

Del the Cat & espresso should too refer the site.

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#5
In reply to #4

Re: convertion

08/29/2007 7:42 AM

Thank you for wasting my time... My original assertion is correct....

The site offers a guide and is very informative (if you didn't know it to start with)...

A guide is NOT a conversion.

Grumpy Del

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#6
In reply to #4

Re: convertion

08/29/2007 8:28 AM

Yeh my Yamaha FS1E was never as quick once I put an ATCO lawnmower engine in it even though they were both 50cc !

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#10
In reply to #4

ConverSion

08/30/2007 3:35 AM

They are right to say there is no conversion. If you have a specific engine in mind, maybe that's a different story. You say a 125cc motorcycle engine. The SIMetric site says about 33hp. However, if you go to the Honda website and look at a few of their 125cc models, the output ranges from 9bhp to 15bhp. So if you're happy with a possible error of about 360% in your calculations, that's fine.

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#9
In reply to #3

Re: convertion

08/30/2007 1:16 AM

Thank you very much pwslack your gesture site is very usefull majeed

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#7

Re: Convertion

08/29/2007 9:55 AM

Well thats a bit of a duff link...

that just shows Del and Expresso are perfectly correct in saying there is no direct link between cc and horsepower...

The list gives a conversion factor of between 1 and 234 cc to the horsepower...

What utter nonsense - John.

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#11
In reply to #7

Re: Convertion

08/30/2007 7:25 AM

If your engine was manufactured in russia like the moped called RIGA that is powered by a 50ccm engine with the output power of 2.5hp/100km at 2.6+liter.

Yet, if it was a former east-german made SIMSON powered by a 50ccm engine with the output power of 3.6hp/100km at 1.8+liter then you can see the difference in efficiency.

(Not to mention the russian built bike would wear out after about 10,000km while the other would last 3x plus longer.)

I think the others were right. There is no direct comparison between ccm to hp due to efficiency factor!

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#8

Re: Convertion

08/29/2007 11:39 PM

Put it on an engine Dynamometer

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#12

Re: Convertion

08/30/2007 10:34 AM

There was an old method used for taxation & I believe insurance, many years ago in the UK, where 1 liter engine capacity was considered to be 10 HP if I remember correctly..

I was very confusing to a lot of folks and has not I believe, been used for years!!!

Which was I believe the reason that HP & BHP were both used, I could be wrong there though!! Maybe someone else can give us some solid facts in this area....

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