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Hot Rod Forum : Hotrodders Bulletin Board > General Discussion> Hotrodders' Lounge> Whats the difference between the old HP ratings vs. the net ratings?
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Topic Review (Newest First)
06-24-2011 01:56 PM
Valkyrie5.7 Anything you ever wanted to know about measuring horsepower can be found here:

Wikipedia - Horsepower
06-24-2011 01:50 PM
Whats the difference between the old HP ratings vs. the net ratings?

What I'm trying to figure out, is how do you translate the power differences between the pre-1971 cars and the post 1971 cars. They changed to net ratings in 1971, but what does that mean, and how are they measured versus how horsepower was previously measured?

I now hear that there is an even newer method that they now use to measure HP and torque...... How is it done, and how is it compared/translated to older methods?

Did cars made in the US after 1974 really have that much less power, or is it partially a difference between net and gross measurements? I know they had less power after 1972-1974, but I dont know how to compare the net vs gross measurements........

I think there should just be one consistent way to measure. Like from the rear wheels only.........

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