dot to dot cam marks is 2 deg off ?
dot to dot cam marks is 2 deg off ? i installed a lingenfelter gt2-3 cam using the dot to dot method as there was no adjustable quick single chain sprocket i could get my hands on 
but using the ls2 chain which has some more slack that the original chain i measured a 2-3 degree diff.
eg. cam should open inlet at 9 deg before TDC and it opend at 6-7 deg before TDC
no biggie ?
but using the ls2 chain which has some more slack that the original chain i measured a 2-3 degree diff.
eg. cam should open inlet at 9 deg before TDC and it opend at 6-7 deg before TDC
no biggie ?
Seems like with most LS1 cams, advance gets ground in the profile, I bet if you call you will find it what ever the LSA is and then +2.
I never seen such a thing until I got into LS1 motors. Maybe LT1's had it too, I just maybe never noticed lol.
I never seen such a thing until I got into LS1 motors. Maybe LT1's had it too, I just maybe never noticed lol.
I used the Comp Cams adjustable timing chain with my cam install...dot-to-dot, mine was off 4 degrees.
2 degrees can have a noticable effect on torque output...I would get an adjustable timing chain and get it right.
JC
2 degrees can have a noticable effect on torque output...I would get an adjustable timing chain and get it right.
JC
I recently checked the cam I've installed in my 6.0L - heads off, on stand - and the ICL came out to be right where I spec'd the cam to be ground (111+0). Installed "dot-to-dot" with the stock LQ4 sprockets and a new LS2 chain.
Staging Lane
Joined: Aug 2006
Posts: 60
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Actually what you should be checking is intake centerline. Not when the valve opens. Find where intake is open .050" then find where intake is .050" from closing. Then split the readings and that is the centerline.
Check this out http://www.compcams.com/technical/Ca...07/379-380.pdf
Check this out http://www.compcams.com/technical/Ca...07/379-380.pdf
did a little dyno testing with my cam today. originally put it in straight up. cam peaked a little soon. so, i retarded the cam 5* to make it 0*. (cam has 5* advance ground into it).
not a good thing to do. this just goes to show that you need to make sure it's installed correctly, or you can lose alot.
not a good thing to do. this just goes to show that you need to make sure it's installed correctly, or you can lose alot.
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Originally Posted by jeejee
i installed a lingenfelter gt2-3 cam using the dot to dot method as there was no adjustable quick single chain sprocket i could get my hands on
but using the ls2 chain which has some more slack that the original chain i measured a 2-3 degree diff.
eg. cam should open inlet at 9 deg before TDC and it opend at 6-7 deg before TDC
no biggie ?
but using the ls2 chain which has some more slack that the original chain i measured a 2-3 degree diff.
eg. cam should open inlet at 9 deg before TDC and it opend at 6-7 deg before TDC
no biggie ?
I suppose to answer your question, using the results mrr23 posted, is the possibility of 10 extra HP and 20 lb-ft no biggie?
Also, based on the original posters observation, it should open at 9* BTDC and it actually opens at 6-7* BTDC, that would be 2-3* retarded, not advanced.
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i never said it was advanced... but "retarded cam" sounded not quite right 
