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Old 01-15-2013, 09:11 AM   #30
WildBillyT
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Quote:
Originally Posted by Mezzy View Post
Yeah bill, I'm not gettin.g what you mean there. Can you please explain? I k ow the industry started to measure the hp at the wheels instead of the crank. Is that what you mean?
The industry never did that to the best of my knowledge. Nobody rates at the wheels. Some ratings may be "light", but not rated at the wheels.

Gross HP was the way they rated horsepower until about 1970-71. They would dyno the engine with no accessories that introduce parasitic hp loss.

After 70-71 they started rating engines via SAE Net- as they were installed in the car, with alternators, factory water pumps, smog pumps, and so forth.

So, that 450hp LS6 chevelle doesn't make 450hp the way we rate it today.
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