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Old 02-14-2015, 07:36 PM
lippy lippy is offline
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Join Date: Apr 2012
Location: Bay Area (Peninsula), CA
Cobra Make, Engine: ERA 427, 427/487 side-oiler
Posts: 1,248
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My Cobra essentially has a race engine. Solid roller, big cam, power really comes on from 4000-7000 RPM. HP peaks at 637, torque peaks at 569. If you keep it below 4000 RPM, it is very tractable and drivable around town. If you want it to come on strong, drive it above 4000. I like it that way and so far it has kept me out of trouble with a bit less low end torque.

Btw, mathematically, HP = TQ * RPM / 5252. That is true for all engines, and why torque and HP are always equal at 5252 RPM. It is also why, for example, truck engines have a lot of torque but not a lot of HP because they need to produce torque at low RPM for towing but don't rev high. Race cars run flat out at high RPM so torque at low RPM is less important. It all depends what you are solving for, but the constraints are the same. In a Cobra, to me torque is somewhat less important because you just don't need that much for a light car to feel lively.
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