Posted by RN on February 20, 2010 at 10:48:31 from (184.60.14.1):
In Reply to: HP vs HP posted by rustbucket on February 20, 2010 at 08:52:22:
Back to some basics. SAE=Society of Automotive Engineers-- peak horse power rating is at max rpm with minimal accesseries- as in no muffler, no aircleaner, no generators/altenators. DIN=Duetsch Industrial Norm (or something like that) and rates Horse Power as PS =(Pherd Stark) with all normal in use equipment. This is also a peak hp advertised but can have a working RPM rating. VW Beetle Engine in US advertised as 40hp is in Germany and many other countries a 35/36 hp engine or in some cases a 30hp engine when power to ground through transmission is included. This is similar to the wheel horsepower advertising that took place mid 1970s in US- the 200hp engines from previous year became 150/160hp engine with no change- a 20/25%drop from bare peak hp to actual working use equiped hp. The Onan may have a SAE rating at 4400 rpm without muffler and aircleaner- governor allowed to run to 4400 no load before limiting, the Wisconsin may have been rated at 3200 rpm as were many older small engines that were governed to run under working load at that rpm. Some of the older Kohlers and Brigges were governed and power rated at 2200 to 2400 rpm, some of the generator models were governed to 1800 rpm to get right electrical cycle. Check tag if you can find one on Wisconsin-hp rating probable notes rpm, at least the few old Wisconsins that had full tag remaining I"ve seen had the rpm noted for hp. If you check archives for nebraska test results most of the ratings will have the PTO or belt rating and the engine hp/rpm--as old JD B running at 1100 rpm and IHC H running at 1650. JD B had 179 or some such displacement (B had 2 engine sizes I know- green gang can post the early and late size), IHC had 152 inch or so, Hp ratings close to same, both rated 2 plow pullers. Have fun with engines. RN
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