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Re: Intake valve carbon accumulation. (archive)
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Posted by John on January 15, 2001 at 04:46:04:

In Reply to: Intake valve carbon accumulation. posted by Daniel N. on January 14, 2001 at 11:05:12:

BMW was also shocked by the accumulation. A voluntary "Walnut Shell" cleaning was done on the 3.5L in 86/87 to clean the carbon. In 96 took the head off my 85 to install a 282 cam, lots of carbon on the intake valves, pistons, etc. No I'm not using cheap gas, oil or etc. This year, I replaced the older 3.5l, 185HP, with the later 3.5L 208HP. The later 3.5 intake valves, 102k, were cleaner than my early 3.5. Draw you own conlusions; however, the early model 3.5 appears to suffer more.


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