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Originally Posted by bmwm750
Just curious, what happened to the 02s with respect to the timing chain?
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Hi,
Porsche was concerned about vibration issues in the engine and also switching to an Oil (as opposed to electro-solenoid) activated VarioCam, so they changed the configuration of the IMS, was a double-bearing, switch to a single. Also, the timing chain profile was changes and the sprocket. It may have solved a vibration issue, but apparently at the cost of some reliability. IMS failure on the earlier cars is almost nonexistent, you could almost say rare. It is an issue on the later cars, not as prevelant as RMS failure, but it usually takes the engine out with it...
Happy Motoring!... Jim'99
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