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Tractor Talk Discussion Forum

Re: blow-by

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Author 
buickanddeere

04-07-2005 22:05:59




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Fuel/air mixture isn't supposed to explode. That is rapid uncontrolled burning with very high pressure spikes. Called knocking or detonation. Broken cranks, spun bearings, bent roads, crushed ring lands, broken rings, cracked pistons and blown head gaskets are the result. Combustion is supposed to be a progressive burn from the spark plug to the combustion chamber edges. Or a progressive burn of fuel oil in a diesel as fuel is injected. No piston/ring to cylinder wall seal is perfect. It's the degree of leakage or blowby. Not if blowby exists. Blowby is noticed when the crankcase vent system cannot handle the combustion pressure bypassed into the crankcase.

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