Posted by John T on November 06, 2012 at 04:28:59 from (216.249.82.117):
In Reply to: True Horse Power posted by Idaho spud on November 05, 2012 at 21:40:15:
Horsepower is a function of Torque x RPM, thats why the HP rating is quoted at X RPM. A small lawn mower engine with a short stroke obviously doesnt have much Torque, so to get much HP it runs at a fast RPM such as say 3600 versus a long stroke higher torque engine that only runs at maybe 1000 RPM..... The old 2 banger Johnny Poppers ran at low RPM but had a longgggggggggg stroke which gave them their torque so they could develop perhaps 40 HP at 1200 RPM
HOWEVER the same vintage screaming 6 cyliner Olivers didnt have as much Torque and a shorter stroke butttttttttt they got say 40 HP cuz they ran at a much faster RPM Get it?????????
HP is a function of Torque x RPM and thats the bottom line
I have to agree with the antecdotal evidence, my old John Deere B is rated at like 13 HP, while my lawn mower is 25, so gear them down and weight them however it takes and I just dont see the 25 HP engine ever outperforming (actual work) the 13 HP Deere??????
Last thought, HP in todays world may be part hype like when they started rating power amplifiers at 40 watts which were only maybe 20 watts a few years earlier?????
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