Posted by buickanddeere on January 31, 2011 at 11:47:30 from (192.75.48.150):
In Reply to: Re: HP??? posted by jackinok on January 31, 2011 at 08:56:18:
You can't cheap the laws of physics. Plug the numbers into the formula and see. Contrary to the feeling of many. 100lb ft of torque at 3000rpm. Makes exactly the same amount of power as 300lb ft of torque at 1000rpm. Many people get confused with "torque rise" when an engine is overloaded and lugged. They think the engine has become more powerful, which it has not become more powerful. Less work is being peformed per hour when lugged to peak torque vs. when operated at peak HP rpms. As for long stroke vs. short stroke? Peak torque occures at the rpms where peak volumetric effeicency occurs. Take the same heads cam, manifolds etc eg a small block Chevs. A long stroke small bore 265 from the early 1980's and dyno the engine. Transplant everything onto a different short block with a large bore 4" bore and a crankshaft destroked to make 265cu ". Much to most peoples shock, the large bore, short stroke engine will make the same HP and torque. What you are lossing in stroke leverage you are making up in more piston surface area for combustion pressure to push against.
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