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Not sure what model you are speaking of, but I agree with previous posters, sounds like your building up pressure. If I remember correctly when I owned my first TR250 back in the 70's we took off the Gulp valve (PCV) and ran a hose down below the engine into the slipstream with a 45% angle cut with the lower part of the hose towards the front. As you drove the air passing beneath would suck out anything building up in the crankcase. May not meet EPA regs, but they don't even look under the hood on a lot of the older cars anyway.
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Crankcase breather
- Thread starter gjh2007
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You don't actually want to suck out crankcase gasses - you merely want to prevent pressure buildup. That's the purpose of a PCV valve - to release pressurized gasses into the intake stream, but close off that route when the pressure isn't too high.
Be aware that much of the "vapour" in the crankcase is actually oil mist, and if you acheive a venturi effect with the breather as you describe, you will lose significant amounts of oil at speed. (Don't ask me how I know
) You merely want to vent pressure, not create suction.
Be aware that much of the "vapour" in the crankcase is actually oil mist, and if you acheive a venturi effect with the breather as you describe, you will lose significant amounts of oil at speed. (Don't ask me how I know
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Guys,
I put a slight negative pressure on my valve cover that goes through an oil separator canister that drops the oil back into the pan. The triple ZS carbs do the work.
Got it from goodparts. Works well.
Bill
I put a slight negative pressure on my valve cover that goes through an oil separator canister that drops the oil back into the pan. The triple ZS carbs do the work.
Got it from goodparts. Works well.
Bill