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Classic Goldwing Technical Forums
General Classic Goldwing Technical Forum
Blow-by and crankcase ventilation-fuel contamination?
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<blockquote data-quote="AApple" data-source="post: 167735" data-attributes="member: 56"><p>Pretty much ANY internal combustion engine is gunna have <strong>some</strong> "blow by"....compression gasses getting by the piston rings. A small amount of fuel, both raw and diluted/burned will be present. No escaping it. </p><p>One thing that can also cause vapors to blow out of the breather is simply the rotation of the crankshaft, pushing/pulling the pistons up/down. This creates pulses of air inside the crankcase, which can/will create puffs out thru the vent tube. The main difference between the crank created pulses, and blow by is, blow by is usually a smoky vapor. These engines have a vapor trap can on them to catch the vapors as they turn back into a solid oil, from the factory...</p><p>[GALLERY=media, 19723][/GALLERY]</p><p></p><p>So basically, SOME air/smoke coming from the crank vent is to be considered normal. If there is so much blow by that it looks like a Cheech & Chong movie, then it would most likely also be smoking from the tailpipes, the plugs would foul easily, and the engine would not run well. This would constitute too much blow-by. I actually still have a small tester to check blow by pressures in automotive engines. You just pull the PCV valve out, and attach this little gauge, and it moves a little ball up in the register. The higher the ball goes, the more blow by there is. The tester is calibrated to show from "Normal" to "Excessive".</p></blockquote><p></p>
[QUOTE="AApple, post: 167735, member: 56"] Pretty much ANY internal combustion engine is gunna have [b]some[/b] "blow by"....compression gasses getting by the piston rings. A small amount of fuel, both raw and diluted/burned will be present. No escaping it. One thing that can also cause vapors to blow out of the breather is simply the rotation of the crankshaft, pushing/pulling the pistons up/down. This creates pulses of air inside the crankcase, which can/will create puffs out thru the vent tube. The main difference between the crank created pulses, and blow by is, blow by is usually a smoky vapor. These engines have a vapor trap can on them to catch the vapors as they turn back into a solid oil, from the factory... [GALLERY=media, 19723][/GALLERY] So basically, SOME air/smoke coming from the crank vent is to be considered normal. If there is so much blow by that it looks like a Cheech & Chong movie, then it would most likely also be smoking from the tailpipes, the plugs would foul easily, and the engine would not run well. This would constitute too much blow-by. I actually still have a small tester to check blow by pressures in automotive engines. You just pull the PCV valve out, and attach this little gauge, and it moves a little ball up in the register. The higher the ball goes, the more blow by there is. The tester is calibrated to show from "Normal" to "Excessive". [/QUOTE]
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Classic Goldwing Technical Forums
General Classic Goldwing Technical Forum
Blow-by and crankcase ventilation-fuel contamination?
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