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greasemonkee 06-19-2009 01:12 PM

Canceling out pumping losses of throttle governed engines
Tests have revealed that a vacuum on the crankcase is of negligible benefit of an otherwise stock engine.

At 7 in/hg of vacuum the seals were screaming bloody murder while drawing in air.

This thread can be considered null

Christ 06-19-2009 01:16 PM

They do this with vacuum pumps for race cars... yes, vacuum in the block is a good thing, and it actually provides more than "marginally greater" ring seals.

I'm not entirely sure how much vacuum they use, but you can get belt-driven vacuum pumps from Summit Racing and Jegs for the purpose.

hyperyaris 06-19-2009 02:12 PM

It is illegal in the US.

Christ 06-19-2009 02:13 PM


hyperyaris 06-19-2009 02:16 PM

What exactly is a catch can and how does it benefit? [Archive] - The Australian 300zx Owners Association

hyperyaris 06-19-2009 02:16 PM

Oops ignore Australian one lol

Christ 06-19-2009 02:18 PM

Try again - that article had to do with bypassing the PCV system. What the OP is talking about involves using the OEM PCV system with a higher vacuum - i.e. still feeding the crankcase vent into the intake system to be properly recirculated and burned.

hyperyaris 06-19-2009 02:21 PM

Ah ok. I thought he was bypassing it. My mistake.

KJSatz 06-19-2009 02:50 PM

Honda's R18 has a system to help with that, right?

PaleMelanesian 06-19-2009 04:21 PM

Pulse and glide solves the problem.

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