Re: Small engine power ratings

Posted by RN on April 29, 2017 at 12:08:48 from (205.213.104.118):

In Reply to: Small engine power ratings posted by roaddevil49 on April 28, 2017 at 19:00:18:

Minor problem with the standards used to measure the horsepower- US used SAE method that meant peak power with no added equipment- like mufflers, generators, air cleaners- and the small engine got the same bare of equipment, run to peak power ratings. Germany used a different method- DIN- and the the N was 'normal' in use, meaning mufflers, etc. classic was the VW Beetle 1200cc rated at 30 hp in Germany that became a 36 hp in US market. Some OEM engines had multiple ratings- a 'peak rating' by SAE standards, then the power as the user meant it to be used, Tecumseh and Kohlers had 15 hp@4400rpm or more peak engines that were also rated at 1800 rpm at 5 hp, 8 hp at 2200 or 2400 rpm. The generator maker would advertise the 5hp rating, competitor would advertise 12 hp(peak or close to peak) and customers would get confused sometimes- and buy the one with more advertised power. Mid season the Tecumseh would be advertised at same power as competitor, same leftover stock, just a new sticker slapped on shroud over old sticker. Cars in mid 1970s or so had to advertise 'wheel horsepower' instead of SAE- the small block chevy 327 that was 225 hp previous year became a 150 hp engine. Small engines had the advertising race as engines- the manufacturers would sometimes advertise as user hp, other as peak and finally legal hassle that said same comparable method would be used or payment to lawyer expected. Torque rating at specified rpm is comparable, more so than varying hp depending on governor settings. And actual displacement is specific, easy to measure, less subject to legal hassles by bone picking bar buzzards. Some small engines were advertised by real old 'taxable' power ratings- simple measure the bore size, no concerns with governed rpm, stroke, compression ratios, added equipment- and the advantage for market was everyone met same standard for the 'taxable' hp. The Brigges 196cc is maybe a 5hp (or 3.5)- the Harbor freight 'Predator' 212cc is 6.5 hp advertised. Need to check governed speed as installed for own figure of hp, maybe it is advertised as to be used, maybe as peak- then you check warrantee papers. RN

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