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

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.

It is illegal in the US.

Source?

www.supersixmotorsports.com/pdf/PCVBypass.pdf

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

Oops ignore Australian one lol

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.

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

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

Pulse and glide solves the problem.