![]() The pump didn't discharge as well when the engine was really hitting it good. I didn't have a high performance free flow exhaust to go with it. Using this method, there's no oil in the intake tract, no crankcase gases get to the atmosphere, and the crankcase is under 7-9" of vacuum at all times. Previously had one of them routed to the exhaust, but the pump has an easier life this way. ![]() Any part of the intake tract feels dry as a bone. This actually doesn't even make the air filter oily. I have very small, basic breathers in the opposite valve cover to allow a little fresh air to move through the crankcase. The discharge of the vacuum pump is routed back to the intake air box (pre filter) to prevent stink (a real problem with some oils) and emissions. Vaccuum pumps suck through a catch can first in order to protect the pump from oil. Two of my cars have Ford electric emissions pumps made into vacuum pumps that suck air out of the crankcase. ![]() ![]() Keeping the crankcase under vacuum also majorly reduces bay-to-bay breathing and turbulence inside of the engine. Vaccuum improves ring seal, and also prevents ring flutter due to the rings pressing down on crankcase air while on down stroke. ![]()
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