Why is my DOD retarded? (Cam timing issue)
05-22-2014, 08:37 AM
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Why is my DOD retarded? (Cam timing issue)
Has anyone degreed in a cam on a DOD crankshaft? Are the keyways in a DOD crankshaft cut to a different position than a standard NON-DOD crankshaft?
Reason I ask is I recently installed a new aftermarket isky cam. Originally just threw the cam in 2* advanced and ran it. Car ran horrible. So I got out the degree wheel and an OEM timing set. Come to find the cam is 6.5*retarded to the cam card “Dot to Dot” with an OEM gear set. (8.5* total!) I thought I had a bad cam so I ordered another. I got the exact same 6.5* retarded reading “Dot to Dot”. With an adjustable timing set I was able to get the cam to degree in .5* Adv from the cam card spec. Put the car back together and it’s a monster. Went from 160-195+ cranking compression. Sounds completely different, revs faster and makes a ton more power.
IMO I’ve pretty much eliminated the timing set’s as I have used 1 older OEM set and one brand new OEM set with the same results. And I’ve eliminated the camshaft error. 1 or 2 degrees may still be in the camshafts, but the majority I believe to be in the crank keyway positioning.
Anyone else degree a cam in on a DOD 5.3? (LC9 I believe, 2008 alum 5.3, no variable timing on this one) If you didn’t and your down on power, you may want to!
Reason I ask is I recently installed a new aftermarket isky cam. Originally just threw the cam in 2* advanced and ran it. Car ran horrible. So I got out the degree wheel and an OEM timing set. Come to find the cam is 6.5*retarded to the cam card “Dot to Dot” with an OEM gear set. (8.5* total!) I thought I had a bad cam so I ordered another. I got the exact same 6.5* retarded reading “Dot to Dot”. With an adjustable timing set I was able to get the cam to degree in .5* Adv from the cam card spec. Put the car back together and it’s a monster. Went from 160-195+ cranking compression. Sounds completely different, revs faster and makes a ton more power.
IMO I’ve pretty much eliminated the timing set’s as I have used 1 older OEM set and one brand new OEM set with the same results. And I’ve eliminated the camshaft error. 1 or 2 degrees may still be in the camshafts, but the majority I believe to be in the crank keyway positioning.
Anyone else degree a cam in on a DOD 5.3? (LC9 I believe, 2008 alum 5.3, no variable timing on this one) If you didn’t and your down on power, you may want to!
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