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

Sean221A · 07-08-2008, 05:44 PM

The car has a MSD optispark on it. I have a FAST ecu for it so do you have any idea about what changes or were i would have to make the changes? Still learning on this car appreciate any help i can get.

Ed Wright · 07-08-2008, 06:22 PM

Quote:

Originally Posted by Sean221A

The car has a MSD optispark on it. I have a FAST ecu for it so do you have any idea about what changes or were i would have to make the changes? Still learning on this car appreciate any help i can get.

Do you have a timing pointer on it? If so, I set the idle area of the spark table to some round value, like 20 or 30 degrees, then check the timing with a light. If they do not (And you have an XFI system) agree just change the "Crank Reference Angle" value found under "Operational Parameters" (upper/right corner of that dialog box) until the timing pointer agrees with the numbers in your spark table. Mine was set to 3 when I was still running an Optispark. If you have the older FAST, it's probably the same deal, but I don't know that everything is named the same. Mine is the XFI system. If you don't have a timing pointer you sure need to rig one up, otherwise you have no way of knowing for sure how much timing your running.

Good luck, Ed

Sean221A · 07-10-2008, 05:31 PM

Thanks Ed i will be sure to try that. Yes it is the XFI system. We've got a pointer rigged up so we will have to try and see as per your directions what it does. Thank you very much will get back to you and appreciate the help.

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

07-08-2008, 05:44 PM	#8
Sean221A Junior Member Join Date: Apr 2008 Posts: 23 Likes: 0 Liked 0 Times in 0 Posts	Re: Cam timing problem lt1 The car has a MSD optispark on it. I have a FAST ecu for it so do you have any idea about what changes or were i would have to make the changes? Still learning on this car appreciate any help i can get.

07-10-2008, 05:31 PM	#10
Sean221A Junior Member Join Date: Apr 2008 Posts: 23 Likes: 0 Liked 0 Times in 0 Posts	Re: Cam timing problem lt1 Thanks Ed i will be sure to try that. Yes it is the XFI system. We've got a pointer rigged up so we will have to try and see as per your directions what it does. Thank you very much will get back to you and appreciate the help.