Thread: Cam Chains
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fredmeister fredmeister is offline
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Join Date: Oct 2002
Location: Baltimore, MD, USA
Posts: 2,229
When you inspected the cam sprockets do they look worn or are there weird wear patterns on the teeth?
Ideally you should change the sprockets on both the cams and intermediate pulley when chains are replaced as they all wear together. Chains (the links) don't actually stretch but the radial clearance between each bushing in the links and the holes in the end links wears and in effect you get an incremental offset between each link in the chain. Multiply that by the amount of links in the chain and the overall length seems to stretch.
Larger idler sprockets is a good idea, and will be the only way to gain back clearance between the tensioner arm and the chain housing and put the tensioner arm geometry back into its designed working range. Jerry Woods seems to know his ****.
Doesn't explain why this was not apparent immediately during the rebuild as soon as tension was put on the chains.
What you really wanna do is replace the chain with a gear that would be killer.
1979 930 Turbo....3.4L, 7.5to1 comp, SC cams, B&B intercooler, Snow Perf water/meth injection, Rarlyl8 headers, Garret GTX turbo, 36mm ported intakes, Innovate Auxbox/LM-1, custom Manually Adjustable wastegate housing (0.8-1.1bar),--running 0.7bar max
---"When you're racing it's life! Anything else either before or after, is just waiting"
Old 07-29-2008, 12:39 PM
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