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Knock sensor?1990 745TI (141,000) 700

posted by  Rolyak on  Wed Jan 2 04:47 CST 2008
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last visit: Fri Oct 24 08:03 CST 2014
[RELATED]

Piston slap is a result of piston skirt to cylinder wall clearance.It really doesn't have to be excessive to slap. Later red blocks had piston coolers (squirters) and are reportedly quieter. It is nick-named the "Tractor Motor" probably for that reason!

To ease your mind a little my '87 turbo has slapped since I rebuilt it 10 years ago (with used pistons) and now has 481,000 miles (not kilometers)

I fully expect mine to see the half million mile mark! Then I might think about a later engine.






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