There certainly would be risk if the vent line was blocked off. What about this approach. A valve that in position A allows normal crankcase vent pass through to the air cleaner. Position B allows venting the crankcase to outside air. Worst case is if you forget to put back into normal operating position, the crankcase is vented but not under vacuum. Is negative crankcase pressure a requirement?


2019 M3W 110 Anniversary Black
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