Easiest way to tell is just go by engine size. The rest can be very misleading. The only thing that's changed is that an overhead-valve version of an engine can make a bit more power for it's size as compared to a flat-head. A 10 horse flat head often gained 1.5 to 2 horse when switched to overhead valves. Note also that diesel engines always have less power then gas engine if aspirated the same and with same bore and stroke. That is why tractors sold at a certain power level will have bigger diesels to make up for the loss.
20-30 years ago -
A 3 horse engine was 7 3/4 cubic inches or 127 ccs.
A 4 horse was 10.5 c.i. or 172 ccs. A 5 horse was 12 c.i. or 197 ccs. A 10 horse was 24 c.i. or 393 ccs. A 16 horse was 32.4 or 531 ccs.
Besides all that, direct-drive push mowers often post specs at RPMs that engine are not legally permitted to run due to blade-tip-speed regs.
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Today's Featured Article - Talk of the Town: Winterizing Engines - To Drain or Not to Drain? - by Russ Berry. What is this strange attraction I have to equipment and machinery? How did I get this way? I came from the suburbs and own a small horse farm in rural Loudoun County, Virginia. You can call me a "weekend farmer." The local farmers do. Does it bother me? No. I am just happy to have their friendship. At least the word "farmer" is in my title. But what is the attraction? How can I explain the sensation and exhilaration I feel when I turn the key and hear the engine come to life (most
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