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CID Vs. Horse Power?

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I'm looking at a motor with the model number 306214. According to B&S that is 30 CI of displacement. Since these are the only numbers I have to go by, is there any way to determine the HP?

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Ibelee, You did not say but apparently you are looking at a vertical shaft engine. I have a 30 CID Briggs horizontal shaft engine which is 13 hp but I think there are some 12hp Briggs engines with 30 CID as well.

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The rule of thumb is to multiply the cubic inch displacement by .4 to get an approximate hp rating. Note that I said APPROXIMATE. Also note that this applies only to single cylinder, L-head engines. Compression ratios, rpm's, air and fuel intake will all cause variations, but it gives you a general idea. When you reach 14 horsepower, the formula starts to drop off and isn't nearly as close as smaller engines.

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