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 - Some People Like Red - by Art Willis. I was smitten, as a little boy, by red tractors. I used to play in the coastal sand of my Dad & Mom's home with little red tractors, trucks and cars. I grew up believing that like fire trucks, ALL tractors are supposed to be red! Today, the only way I would drive a John Deere is if someone would paint it RED! Driving a Tractor for the first time - About 19 years ago, when my wife Donna and I moved to what was the country then, I was given access to a large Farmall tractor by a wi
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