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Not interchangeable... (archive)

[ Follow Ups ] [ E30 M3 Message Board ] [ Msg. Board FAQ ]

Posted by JamesM on October 03, 2000 at 11:37:26:

In Reply to: Cam gear part number? posted by GregK on October 02, 2000 at 19:03:51:

As far as I know, the US M5 has a single row timing chain. The M3's all have double-row chains. I don't think the M3 part will work. The older M635CSi had the double-row chain, so that's where the confusion is coming from. You could install the double row chain, guides, tensioner rails, and all 4 sprockets:

The part for the Evo3 cam sprocket is marked with "A100" instead of just "A". Converting sounds expensive, but the standard single-row chains have been known to break under hard use. You planning to go to the track a lot? If you've torn the whole engine apart already, installing these parts only involves cost and a few minutes to bolt everything on.

Also, the exhaust cam gear was installed to advance the exhaust cam timing in racing engines for more overlap and higher torque peaks. Retarding only lowers the peak torque about 1000 RPM in the M3 engine, thus giving you more low-end grunt. It does hinder performance above 6000 RPM. You could try buying aftermarket (Dinan may have them) adjustable cam sprockets.

Good luck with the beast!
[email protected]
88 M3 Henna
83 535i

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