What causes carbon in the combustion chamber?
Date: Thu, 14 Nov 1991 06:06:30 PST From: John_C._Ackerman.Wbst311@xerox.com Subject: Carbon buildup To: Volvo-Net@me.rochester.edu Howdy All, On the subject of carbon in the combustion chamber, not only will the carbon raise the compression ratio, but in some instances will retain enough of the heat from combustion to cause pre-ignition (detonation). Another factor which will play into the scene, as John Werner mentioned is the state of tune that the engine is in. A engine that runs rich will have less of a tendancy to suffer from pre ignition, but will not run as efficiently as a correctly produced engine (it also produces lots of nasty Hydrocarbon emissions as a by product). On the other hand, a lean engine will suffer from detonation with little provocation, although less fuel is used and fewer hydrocarbons are produced, the engine will run hotter and also will produce more nasty Nox emissions than a correctly tuned engine. (B.T.W. Although a diesel engine produces lots of particul
