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-   -   Ft. Lbs. & CC equivalents (http://www.houserepairtalk.com/f11/ft-lbs-cc-equivalents-4119/)

 kok328 05-01-2008 04:33 PM

Ft. Lbs. & CC equivalents

I am in the process of shopping for a new lawnmower.
Now I know about all the options out there and am used to comparing engines based on horsepower but, got a bit of a surprise by the latest labeling on engines.

They are advertised by foot pounds of torque and CC's.
How do these two ratings interpret into horsepower.
I realize the larger the number for both ft. lbs. & cc's, the bigger the engine but, don't know what the ft. lbs. & cc's are for a 4hp, 5hp, etc... engine.

Can anyone translate ft. lbs. &/or cc's into hp?

 inspectorD 05-02-2008 05:34 AM

Apple to oranges

This is where it gets confusing, you cant measure the two together. Its like asking how many gallons of water does it take to walk 20 miles in. There are to many variables and a bunch of math involved.

Basics to try to convert is like 18 CC's per horse power is a realistic best guess from what I have heard . The difference comes because Cubic centimeters are a measure of volume, or the size of a piston - horsepower is a measure of work done over a period of time. However you could convert horsepower to KW with a bunch of equasions, but this won't help your cause.
I'm here to confuse ...so anyone else?:D

 CraigFL 05-02-2008 05:49 AM

If you frequently forget conversion factors like I do, you can go here:

www.onlineconversion.com

D is right in that you can't get HP from just torque or CCs. If you want to get some comparisons on engine sizes and HP, you could go to the Briggs & Stratton website sine these are common engines used on lawnmowers. But, there are probably much more important things to consider when buying one. I, myself would be most concerned about overall reliability of the unit plus price.

 inspectorD 05-02-2008 05:55 AM

Nice

Great site Craig...that should be on a sticky thread.

I like Honda motors, they have a great track record.

 kok328 05-04-2008 10:50 AM

Thanks for the info.

Unfortunately, price is dictating my selection.

All I wanted was a self propelled, fwd, mulch/bagger, min. 21" & 5hp.

I had to settle for 21" not 22" and got a single speed not variable speed.

It's a 190CC (whatever that means in terms of hp) and it's a Briggs&Stratton engine.

 inspectorD 05-04-2008 03:43 PM

Sounds good.