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PCA Member since 1988
Join Date: Feb 2018
Location: SW Washington State
Posts: 4,651
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JW, Ivan, others: Something else that will indicate chain wear is the cam timing. As the chain wears and "stretches" the cam will become more retarded (no pun in intended). Given the lengths of the chain on the tension side of the sprockets, I would expect a small amount of wear to shift the cam timing noticeably.
Note: This is common on Mercedes OM617 and OM616 diesel engines, which I have owned, and checked the timing and retimed them. It's usually not significant until about 200Kmi., but Mercedes diesel owners tend to drive their cars a long time!
However, I have not noticed significant cam timing shift on my engine (but only 30K since a major rebuild), and I have not heard others complain about it, so that also would indicate the chains last a long time. Have you heard or observed cam timing changes in higher mileage engines?
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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners.
Cars are for driving. If you want art, get something you can hang on the wall!
Last edited by PeteKz; 12-15-2025 at 05:22 PM..
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