cam
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Senior User
Joined: Dec 2003
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From: THE SOUTH
cam
where should i set a comp cams 255 deh 4+ ,0, or 4- on the timming. this is on the crank gear. and what is the best total timing. also if set cam straight up what should the timing be set at, hope you understand what i'm asking.
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From: Okla.
That small of a cam I would say at 0. The way I set my timing is pull #1 puge and bring it to tdc. Pull the cap and set the sprag strait at the pickup. If you are 1/2 a sprag off that is 7 1/2 rotion of the crank, it could run hot at that setting.
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Joined: Aug 2001
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From: Delaware
The Comp Cams 255DEH is meant to be set a 0 degrees or straight up timing. If you set it +4 degrees you will increase the low RPM torque at the expense of high RPM torque and horsepower. If you set it to -4 degrees you will lower the dynamic compression and reduce gas mileage and reduce low RPM torque, but increase high RPM torque and horsepower.
The ignition timing should stay the same as factory settings.
The factory timing sets are set to -4 degrees for emission purposes. Some Comp Cams cams have a built-in +4 degrees for increased low RPM torque. I wouldn't advise additional cam timing advance for these cams.
The ignition timing should stay the same as factory settings.
The factory timing sets are set to -4 degrees for emission purposes. Some Comp Cams cams have a built-in +4 degrees for increased low RPM torque. I wouldn't advise additional cam timing advance for these cams.
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cam question
i have a comp cams 255deh which is ground +4 degrees advance. in my other post you guys said to install it at (0) degrees ( straight up) so my question is do i set the cam at - 4 degrees to correct the cam grind or still put it straight up at 0 thank for your help
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The comp cam 255DEH is not ground 4 degrees advanced. Aftermarket cams should always be installed straight up. Usually if a manufacturer tells you to install a cam other than straight up it is because it is the wrong cam for your application and they don't have the right one. A cam should be ground for the application. Sometimes racers make small adjustments to the cam timing to get the last few HP out for a specific race setup.
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Joined: Feb 2004
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If you buy the correct cam for your application you always put it in straight up. The best way to check a cam is to use the intake center line settings. Your cam card will have this setting. Degreeing a cam is done so that you get the horsepower in the rpm range that you want it.
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From: Delaware
It is ground so that the intake center line is at 106 degrees and exhaust center line is at 114 degrees, when the cam is installed 'straight up'. This is +4 degrees from a cam with 110 degree center lines. The cam should be installed 'straight up' and checked for intake center at 106 degrees, exhaust at 114 degrees. These numbers should agree with the cam card.
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