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Tops Of Pistons - Condition

benl1981

By benl1981,
in Engines & Forced Induction

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benl1981 Grand Master

benl1981

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Posted (edited)

Just replaced the spark plugs the other day and thought I'd shine a torch down the spark plug hole.

Now most had a fairly black coating on the piston tops (carbon I would imagine). In some areas you can see the metal.

However, on No. 6 piston there was no carbon at all. You could even see a letter/no. cast in the metal. Is No.6 running leaner or is this normal for it to be different.

Anyone else looked down their holes :mad:

None of them had pitting but was wondering if this tells you anything about the fueling and timing.

I pulled out the copper plugs at 35k kms and they all looked ok and consistent.

At one point I connected a vacuum line up to an injctor cleaner bottle and regulated a bit through.

It blew a heap of smoke for a couple of minutes after that ..not so sure I want to do it again..

Edited by benl1981
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