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Re: bypass valve presure openings
Sorry, I Thought you had a problem with the bypass valve concept.
As for the overspinning, I really don't know, from my experience of tearing
down countless turbos (mostly big ones), I never saw an oversppining (that I
was aware of?..), so I don't know. I think it is fair to assume that it is
not a big issue since almost every mfg.. uses some sort of bypass (including
From: Brendan Rudack <email@example.com>
To: Avi Meron <firstname.lastname@example.org>
Cc: Quattro <email@example.com>
Date: Wednesday, January 28, 1998 11:10 PM
Subject: Re: bypass valve presure openings
>On Wed, 28 Jan 1998, Avi Meron wrote:
>> flow to turn the turbine), it only coasts when you let go of the pressure
>> throttle, also it is NOT vented to the atmoshere, it is vented to the air
>> box in.
>Avi, I was referring to Gary's explanation of his friend's 4ktq which is
>being run with a blow-off valve and no wastegate. Ok, Throttle plate
>shuts and blowoff dumps excees pressurized air, wouldn't there be a
>momentary turbo overspeed until pressure from last few piston strokes and
>exhaust manifold pressure clear out through the turbine since there is no
>wastegate? And might it be exagerated when the blow-off opens reducing a
>lot of the resistance on the compressor side? Or are the pressures in the
>EM too small to do that to a turbo spinning at ~100k rpm's?