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YOUR RESEARCHCylinder scoring 3.6 engines
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I have posted some advice on the 997 forum under "how to possibly avoid cylinder scoring) that is also relevant to the 3.6 996 engine.
Baz
Edit by Richard - Link: http://www.porscheclubgbforum.com/fb.asp?m=643249
The fan mod would be the worst thing you could do on its own because it would actually make no difference to the coolant temperature in the block (since it control that by reducing flow) therefore all it would do is slow down flow so that the coolant exitst the engine hotter - just to be cooled more by the extra cooling of the fan.
Scoring very rarely affects 3.4's because the head gaskets are different and improve coolant balance inside the engine and allow more to flow through the block.
Baz
We very rarely have a cylinder scoring problem with a 3.4 because the temperatur distribution in the engine is better and the low spee torque is less. However our advice is not so much that it will be a bad thing but rather more that it is not really as necessary as it is with the larger engines - but no harm will result and if you car ever developed a cooling fault - it may well delay damage so the fault can be found and rectified.
You must remember that we will always give honest advice rather than that which will benefit us financially and so we would not suggest fitting the thermostat to 3.4's if it was not strictly necessary.
Also - as time goes by - we sometimes come across and engine that has failed that has cylinder scoring (when we have never previously seen it before in that model) and so may well revise our advice accordingly.
Regards,
Baz
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