[Diy_efi] crankcase vacuum control

[Jack Vines]

Greetings, Dave,

Most all turbo and high-rpm NA racers run high (10-15")crankcase vacuum.
Ford Motorsports has a good unit.  You can pick up 30-40hp on a strong
engine through reduced pumping losses.  The pistons don't have to compress
the crankcase atmosphere on their way down.

The most important factor for turbos is it keeps the oil out of the
combustion chamber and thus helps prevent detonation under high boost.

thnx, jv.

-----Original Message-----
From: Dave [mailto:dave at lotuscarlton.demon.co.uk]
Sent: Saturday, April 26, 2003 2:54 PM
To: gmecm at diy-efi.org; diy_efi at diy-efi.org
Subject: [Diy_efi] crankcase vacuum control


Hi all,


Has anyone tried controlling crankcase vacuum? Either by pump and a
release valve using the ECM or by passive valves (PCV's)
I hear of some good hp gains. My particular app is turbo'd and I had
wondered do I need to reduce or increase the vacuum as boost builds?


Thanks
-- 
Dave Evans
LO203
Lotus Omega Twin turbo, S6, 377Bhp, 415ft-lbs


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