what is carbon knock???
04-12-2005, 02:29 PM
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"carbon knock" is caused by hot carbon deposits in the cylinder. The hot carbon deposit works like a spark plug causing pre-ignition or dieseling effect when you shut it off.. Its fairly common on older cars with carbs and point type ignition but it a rare thing on modern vehicles. If your getting that kinda carbon build up something is WRONG.
04-12-2005, 02:39 PM
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just thought id ask because in my other post about piston slapping gonzo said it was possible. oh well, guess i'll continue to try and figure out what is knocking in the engine
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04-12-2005, 04:44 PM
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Originally Posted by kbracing96
Or you can buy a STS and drive in the rain...
Nah, that would be more catastrophic. Kinda like the difference between a campfire and the Toba Eruption.
I know you used to be able to buy it at the dealer. I'm not sure where people are buying the stuff now.
04-12-2005, 05:08 PM
#10
Piston slap is the rocking noise of the piston against the cylinder walls do to loose piston clearences,this noise goes away with heat expansion of the piston with normal engine warm up.You can have carbon build up on top the piston and cause a knocking sound similiar to a bearing failure or oil clearence issue.If your engine see's a lot of short runs were engine temps dont alway come up for any length of time and not running the engine hard or long trips,these are a couple of factors which can contribute to carbon build up.