How much hp does a 208cc Troy-Bilt rear tine garden tiller engine have?

Answer 1

This is a good question and nobody knows for sure. A 5 HP Briggs engine is 160 cc so by ration the 208 cc engine would be rated at 6.5 HP. However, their are no Nebraska Tractor Tests made on small engines for lawn and garden equipment. Therefore, manufacturers are free to rate small engines wherever they want. Apparently there have been some enterprising folks who have dyno tested some small engines and filed law suits against the free range nanufacturers. I have noticed that adds recently show lawn mowers, et.al. rated by cc rather than HP. You will see adds that say "previously rate 22 horsepower." Sorry for the long winded answer.

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While this article and it's first answer is true, generally on V8-engines, you can estimate a performance motor to make 1-hp per 16-cc, and for small engines, most Briggs-and-Stratton type small engines are actually recommended by the factory to take the cc size and divide by either 29 or 30, depending on the manufacturer.

Therefore, a performance 6.6-liter V8 engine would be 6600-cc's, or 400-cubic inches, or 400-hp (a reasonable rating for most V8-performance engines on the street), and a 208-cc Briggs-and-Stratton engine would produce approximately 7-hp (it's actual estimated rating by pre-1980 Briggs and Stratton data).

No, size doesn't compare to cc's, however there are some actual 'engine design paradigms' that cannot be avoided without tremendous expense. The instructions above are actually the highlights of what most engine builders know, from years of hard work and expense. Once you cross the 1:1 (1 hp per cubic inch) rating in a V8, 1.3:1 (1.3 HP per cubic inch) for a V6, or 1.75:1 for a I4 engine, or 0.7:1 for a 'small engine' (one or two cylinder with OHV), you start paying greater-and-greater prices to improve components and tweak out performance for ever-diminishing returns.