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cc to HP conversion

12420 Views 19 Replies 9 Participants Last post by  Glenn M
Hi Folks,

Looking at a Generac GP 3250 generator for emergency power use. It has a 207cc engine. Googled "convert cc to HP" and came up with "15-17 cc = 1HP. Doing the math, 207/15=13.8 HP? I had a 5500 Watt Homelite with a 12 HP engine. So, a 3250 watt generator with a 13.8 HP engine?

Is the above mentioned conversion applicable for small gas engines or am I missing something? I know that Generac is a good machine, but that much overkill?

Thanks for your time,

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You could try Harbor freight

I bought one from them a few years back, only it's 11hp 6700 watt. for $500, it has worked great, runs our whole house when needed.
You can't compare CC/CI to hp. The Kohler 26hp in my DGS is 725/44ci. You can get a 20hp engine from Kohler to a 28hp that's 725cc/44ci. That's a 25% difference in Horse power with the same displacement.

2 strokes generally produce more HP per cc than a 4 stroke.
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