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Re: HP is a mathematical function of torque
Posted by Sjer (more from Sjer) on Sun, 8 Dec 2002 19:18:58
In Reply to: HP is a mathematical function of torque, Craig, Sat, 7 Dec 2002 19:20:18
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Torque is the more useful number. Engines run at variable rpm. They have to because gear reduction is necessary. Reporting the high end (high rpm) torque is kind of useless if you are only running at 5000 rpm infrequently.
Torque is the ability to do work. Saab motors can do more work at lower rpms where the torque is useful. For sure turbocharging is the explanation. With a fixed air delivery pressure to the combustion chamber, an engine is limited totally by the mechanical characteristics of the engine. So the higher the rpm, the more torque. With turbocharging, you can deliver a lot of torque by having a higher air/fuel ratio. I think 14:1 is the optimal ratio. Torque peaks at lower rpms where it is more useful.
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