Automotive Manuals Horsepower and Torque SAE net figures change in 1972-73 - Hot Rod Forum : Hotrodders Bulletin Board
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Old 04-17-2003, 09:16 AM
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Post Automotive Manuals Horsepower and Torque SAE net figures change in 1972-73

I have several automotive manuals, chiltons, Motors, etc. In all of them the way they measured HP and Torque changed in 1972-73, does anyone know what the horsepower and torque ratings would be on those 1972-73 motors if they had not performed that changover ? Im most interested in the Buick 455, Ford 460, but if you know of someplace that lists all of em, I would really appreciate a link.

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Old 04-17-2003, 11:59 AM
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When ratings dropped they dropped about 25%, so multiply 1971 and later ratings by 1.25, 1970 and earlier by .75! This will compair apples to apples. Dale
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Old 04-17-2003, 04:56 PM
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I thank you for your reply, however im not understanding. Why would you multiply 1970 and earlier by .75 ? If I understand right, before the change in 1972-73, horsepower and torque were measured at the flywheel. What I was wondering is what the 72-73 figures would be if they were measured at the flywheel. I know that in 1972-73 new polution control laws affect the horsepower and torque of cars. But its hard to tell by how much since at the same time they also changed the way they measured those figures.

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Old 04-17-2003, 06:35 PM
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Heres a site you should like.
http://www.buickstreet.com/72caroftheyear.html
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Old 04-17-2003, 07:20 PM
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There were several reasons hp. dropped , lower compression was one but the main reason was the way engines were tested for hp., before they were run with a dyno waterpump,headers,outside air ,optimized carbs and no parasitic draws (alternator etc.). They then moved to checking them with the different accesories until the current standard which test an engine just as it is plugged into the car, all drives,exhaust everything so you get a more reasonable reading of what you are getting.

[ April 17, 2003: Message edited by: woodz428 ]</p>
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Old 04-18-2003, 06:24 AM
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Come on guys this gearhead asked a question does anyone know what the horsepower and torque ratings would be on those 1972-73 motors and does'nt need the hassel of what or why the motors changed. Please help the guy.
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Old 04-18-2003, 09:20 AM
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Simply put, they are about what they are rated at, previous ones were inflated. The factory ratings are more accurate for then than in years previous.
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