VETDRMS
15+ Year Contributor
- 340
- 21
- Jun 1, 2006
-
Vancouver,
Washington
I am about to wrap up the build on this motor and wanted to verify I set everything up right.
I am using an OEM Galant DOHC 4G64 belt and Fidanza 4G63 adjustable cam gears. I found a few threads on marking these 1/2 tooth off for use on a 4G63. I made these marks and installed straight up at TDC they lined up pretty well.
I degreed the cams using the centerline method as recommended by GSC. The nose of the cam is pretty flat so it was hard to find peak lift, but as long as you stop at the same point on either side of the lobe on the dial indicator it shouldn't matter, right?
The intake cam was right on at a measured centerline of 107*. The exhaust cam, however, when installed straight up was also on a 107* centerline. I had to advance the exhaust cam gear 3* to get it to the correct centerline of 113*?
If the difference in deck height caused by milling the block/head was the cause of this, wouldn't both the intake and exhaust cams needed to be adjusted by the same amount if the cams were ground correctly? (from what I have heard GSC's cams are usually dead on). The block is at a zero deck and a decent amount of material was removed from the head and I am using a .066" gasket. I was surprised to see the intake cam right on.
Here is how everything lines up at true TDC with the exhaust cam advanced by 3*:
At true TDC both dowels are angled slightly in toward each other. Everything look ok?
Thanks!
Travis
I am using an OEM Galant DOHC 4G64 belt and Fidanza 4G63 adjustable cam gears. I found a few threads on marking these 1/2 tooth off for use on a 4G63. I made these marks and installed straight up at TDC they lined up pretty well.
I degreed the cams using the centerline method as recommended by GSC. The nose of the cam is pretty flat so it was hard to find peak lift, but as long as you stop at the same point on either side of the lobe on the dial indicator it shouldn't matter, right?
The intake cam was right on at a measured centerline of 107*. The exhaust cam, however, when installed straight up was also on a 107* centerline. I had to advance the exhaust cam gear 3* to get it to the correct centerline of 113*?
If the difference in deck height caused by milling the block/head was the cause of this, wouldn't both the intake and exhaust cams needed to be adjusted by the same amount if the cams were ground correctly? (from what I have heard GSC's cams are usually dead on). The block is at a zero deck and a decent amount of material was removed from the head and I am using a .066" gasket. I was surprised to see the intake cam right on.
Here is how everything lines up at true TDC with the exhaust cam advanced by 3*:
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At true TDC both dowels are angled slightly in toward each other. Everything look ok?
Thanks!
Travis
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