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crank case vacuum , how much ?

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Hard to know what section to put this in

I have a Hayabusa powered landspeed bike , NA , on Petrol ( gas if you use that term ) i am using 4 separate exhausts , 2 are fitted with a venturi effect tubes and check valve ( see pictures ).

My question is how much crankcase vacuum is “ good” and how much is too much , i have a MAP sensor measuring the crankcase , so will know when and ( if) i am getting the system to work

the bike is 4 metres long ,i sit feet forward , it has a centre hub steering front wheel —- but that’s another post

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Have you read this article:


thanks , good article

answers my questions.