D15b7 with z6 head cam timing 1/2 tooth error fix? - D-series.org

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Old 06-03-2019, 06:16 AM   #1 (permalink)
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Default D15b7 with z6 head cam timing 1/2 tooth error fix?

Ive built a d15b7 with P2p0 rods and vitara pistons, I’ve got a z6 head and an adjustable vms timing gear and I’m aware of the 1/2 tooth error but I’ve looked at tons of posts and haven’t got a definitive answer, do I need to retard or advance the gear to make up for the half tooth error and how many degrees? I’ve heard there’s a 4.5 degree difference to make up for the half tooth error but nobody specified if I need to go 4.5 retard or 4.5 advance.
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Old 06-03-2019, 12:55 PM   #2 (permalink)
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depends if the cam is installed retarded or advanced
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Old 06-03-2019, 01:23 PM   #3 (permalink)
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Originally Posted by transzex View Post
depends if the cam is installed retarded or advanced
is this like the chicken and egg ?who came first?

just use a y timing gear ..
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Old 06-03-2019, 01:36 PM   #4 (permalink)
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Who knows if you installed it retarded or advanced. You either rolled the cam ahead or back to get the belt to line up and slide on.

You can use a Y cam gear to fix this, or now i know this sounds crazy as it gets, but you can use an adjustable cam gear and actually degree your cam into its proper location and even account for head milling, decking and different head gasket thickness.
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Old 06-03-2019, 04:05 PM   #5 (permalink)
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What engine was the adjustable timing gear made for? That will indicate what it really is timing at when zero'd out.

Plenty of resources regarding timing, I prefer finding big pictures I can print out and have near me when I tinker on my cars for easy reference.

Since your cam gear is adjustable, I would find and print out a large cam gear timing dial, and use a spare bolt and some welding wire, and make an indicator stick, and then dig into matching Top Dead Center on the block with TDC of CYL #1.

Once zero'd out, you can start slightly advancing the camshaft until power feels even and strong without hurting low end rpm power.
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Old 06-04-2019, 02:49 AM   #6 (permalink)
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The vms timing gear is a z6 cut gear.
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Old 06-04-2019, 03:23 AM   #7 (permalink)
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If I run a stock y series cam gear do I just install it and time the engine like a stock 1.6?
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Old 06-04-2019, 10:11 AM   #8 (permalink)
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?...

Last edited by robgoof; 06-04-2019 at 10:21 AM.
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