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Old 06-19-2009, 02:12 PM   #1 (permalink)
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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.

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Last edited by greasemonkee; 08-15-2009 at 05:03 AM..
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Old 06-19-2009, 02:16 PM   #2 (permalink)
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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.
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Old 06-19-2009, 03:12 PM   #3 (permalink)
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It is illegal in the US.
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Old 06-19-2009, 03:13 PM   #4 (permalink)
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Source?
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Old 06-19-2009, 03:16 PM   #5 (permalink)
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www.supersixmotorsports.com/pdf/PCVBypass.pdf

What exactly is a catch can and how does it benefit? [Archive] - The Australian 300zx Owners Association
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Old 06-19-2009, 03:16 PM   #6 (permalink)
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Oops ignore Australian one lol
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Old 06-19-2009, 03:18 PM   #7 (permalink)
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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.
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Old 06-19-2009, 03:21 PM   #8 (permalink)
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Ah ok. I thought he was bypassing it. My mistake.
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Old 06-19-2009, 03:50 PM   #9 (permalink)
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Honda's R18 has a system to help with that, right?
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Old 06-19-2009, 05:21 PM   #10 (permalink)
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Pulse and glide solves the problem.


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