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Old 02-21-2008, 09:33 AM
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Advancing Cam Timing ?

Ok I know on double roller there is 3 keys, Advance, Retard and Stock.
I have been wondering what would happen If you set your timing Advanced or retarded on a 350 sbc. Would It have more low end, advanced ?. What does it primarily change ?. Can it increase your Compression ?. Can you even see a change in power ?. Thanks

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Old 02-21-2008, 10:00 AM
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I forgot

one way increases top end the other low end torque. Ford retarded the 460 cams in the 70's so they could meet emmision standards without egr, to save a few bucks they lost about 30 horses doing it... on a 460 you put it back together with a stock cam dead on by using a 68 t bird crank gear . I don't know if gm did that also
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Old 02-21-2008, 10:16 AM
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see the diaghram Adjusting the camshaft installed position (cam timing)
can be an effective method of dialing in the engines torque curve to best match the chassis. Generally, if you need to move the camshaft more than 8 degrees either way from cam card specs, you have the wrong cam.

If your car has a lot of wheel spin, yet seems soft on the top end charge then you may be able to afford to tradeoff some low end torque for top end power by retarding the cam a bit.
If your car has a soft launch but a big top end charge above 3500-4000rpm you may want to try advancing the cam a bit and give up a bit of top end horsepower to gain some low-mid torque for stronger acceleration.
Moving the cam in the motor is a balancing game. You'll always trade one for the other. Generally the point (rpm) of peak engine torque stays about the same. But the torque curve is rocked about the peak by advancing or retarding the cam.
Generally:
Adding or subtracting camshaft duration tends to shift the torque curve as a whole up or down the rpm band. Always trading low rpm for high rpm power as you increase the camshaft duration with the potential and trend to make more peak horsepower with added duration.
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Old 02-21-2008, 10:16 AM
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advance or retard????
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Old 02-21-2008, 10:17 AM
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Quote:
Originally Posted by chevy350_Camd
Ok I know on double roller there is 3 keys, Advance, Retard and Stock.
I have been wondering what would happen If you set your timing Advanced or retarded on a 350 sbc. Would It have more low end, advanced ?. What does it primarily change ?. Can it increase your Compression ?. Can you even see a change in power ?. Thanks
i almost didn't respond to your post kid. but advancing the cam will increase low speed torque, retarding the cam will increase high speed HP and torque. if i set up an engine i always go with the advanced, eventually chain stretch will bring it back to close to "0". if you retard it you will just behind the "8 BALL". for a street motor, advavcing the cam is the way to go!!! now, if you are building an altered (see previosed post) then retarding the cam is the way to go...
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