Cam timing problem lt1

Sean221A · 07-01-2008, 08:38 PM

Installed new bullet racing cam, put cam in at 104. Noticed on motor that the crank timing gear was at 4 degrees retard. Is this is correct or how much advance timing should we run? ... There seems to be a lack of bottom end power after all new parts and best of everything put it. I run the car in C/SA .. 94 camaro lt1....

Thank you very much

Alan Roehrich · 07-01-2008, 08:46 PM

Please describe the method you used to degree the cam in, and show the math as well. If the method and the math are correct, where the crank gear is does not matter.

Bub Whitaker · 07-01-2008, 08:52 PM

Sean... if you degreed the cam to 104... then it doesn't matter where the cam \ crank gears are located. They put the marks on the timing sets for assemblers that don't degree cams... I've found some Bullet cams way off on there dowel to centerline location... if you degree it properly you won't have any problem... usually if you put the cam on a stocker in 2 degrees ahead of the lobe seperation, your in the ball park

Bub Whitaker · 07-01-2008, 09:18 PM

Sorry Alan... was cookin dinner and peckin to reply... if
I had seen you reply before I submited I would of delited as your right on tract...

Alan Roehrich · 07-01-2008, 09:24 PM

No apology needed. My concern is just to make sure that the cam is in where they think it is. Then we can go from there.

And the reason I say that is because I always check my math, my method, and the card about 4 times, because I've caught myself making errors. When I thought I had it right. And I've seen screwed up cam cards. Jere Stahl busted my chops pretty bad about it a couple of times.

Ed Wright · 07-02-2008, 11:01 AM

If you are using a crank trigger on an LT1, moving the dowel pin won't matter. If you are still using the Optispark distributor (Your probably not.) you will need to make adjustments in the computer for the changed timing offset.

Chad Rhodes · 07-02-2008, 04:14 PM

Quote:

Originally Posted by Ed Wright

If you are using a crank trigger on an LT1, moving the dowel pin won't matter. If you are still using the Optispark distributor (Your probably not.) you will need to make adjustments in the computer for the changed timing offset.

i knew that there was something to that, but i did't know how to put it in words

07-01-2008, 08:38 PM	#1
Sean221A Junior Member Join Date: Apr 2008 Posts: 23 Likes: 0 Liked 0 Times in 0 Posts	Cam timing problem lt1 Installed new bullet racing cam, put cam in at 104. Noticed on motor that the crank timing gear was at 4 degrees retard. Is this is correct or how much advance timing should we run? ... There seems to be a lack of bottom end power after all new parts and best of everything put it. I run the car in C/SA .. 94 camaro lt1.... Thank you very much

07-01-2008, 08:46 PM	#2
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,113 Likes: 1,571 Liked 1,826 Times in 414 Posts	Re: Cam timing problem lt1 Please describe the method you used to degree the cam in, and show the math as well. If the method and the math are correct, where the crank gear is does not matter. __________________ Alan Roehrich 212A G/S

07-01-2008, 08:52 PM	#3
Bub Whitaker Member Join Date: Feb 2005 Location: Dayton, MD Posts: 222 Likes: 0 Liked 1 Time in 1 Post	Re: Cam timing problem lt1 Sean... if you degreed the cam to 104... then it doesn't matter where the cam \ crank gears are located. They put the marks on the timing sets for assemblers that don't degree cams... I've found some Bullet cams way off on there dowel to centerline location... if you degree it properly you won't have any problem... usually if you put the cam on a stocker in 2 degrees ahead of the lobe seperation, your in the ball park

07-01-2008, 09:18 PM	#4
Bub Whitaker Member Join Date: Feb 2005 Location: Dayton, MD Posts: 222 Likes: 0 Liked 1 Time in 1 Post	Re: Cam timing problem lt1 Sorry Alan... was cookin dinner and peckin to reply... if I had seen you reply before I submited I would of delited as your right on tract...

07-01-2008, 09:24 PM	#5
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,113 Likes: 1,571 Liked 1,826 Times in 414 Posts	Re: Cam timing problem lt1 No apology needed. My concern is just to make sure that the cam is in where they think it is. Then we can go from there. And the reason I say that is because I always check my math, my method, and the card about 4 times, because I've caught myself making errors. When I thought I had it right. And I've seen screwed up cam cards. Jere Stahl busted my chops pretty bad about it a couple of times. __________________ Alan Roehrich 212A G/S Last edited by Alan Roehrich; 07-01-2008 at 09:45 PM.

07-02-2008, 11:01 AM	#6
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 390 Times in 170 Posts	Re: Cam timing problem lt1 If you are using a crank trigger on an LT1, moving the dowel pin won't matter. If you are still using the Optispark distributor (Your probably not.) you will need to make adjustments in the computer for the changed timing offset. __________________ Ed Wright 4156 SS/JA