Sender: <marv@lancaironline.net> (Marvin Kaye)
To: flyrotary
Date: Tue, 05 Nov 2002 19:14:32 -0500
Message-ID: <redirect-1853717@logan.com>
From: "Dan Ruggirello" <dan_ruggirello@yahoo.com>
References: <3DC7F0CF.8A5618D@earthlink.net>
Subject: turbo questions, stock turbo II vs aftermarket, tuned intake with turbo etc.
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I havn't yet purchased Paul's archive CD so maybe these issue have been
talked about....

1.  Is the stock TurboII turbo the "twin scroll" design?  For flight, is it
being used with the mechanisms to activate the high end inlet?  I am
wondering if anyone has modified it to operate with upper end always on?
The complexity seems like a reason to go with a simpler aftermarket
turbo....

2.  Does tuning the intake work together with the turbocharger?  I suspect
when the turbo is ramming air into the intake this changes the intake
dynamics and a tuned intake may not function well.  Can a tuned intake work
well even when the turbo is off since there is ducting from the intake to
the compressor to cause turbulence?   If I operate with intermittent turbo
(T/O and high altitude) just wondering if a tuned intake for low altitude
cruise is possible.

3.  Is turbo life usually given for aftermarket turbos?  If I operate a
turbo continuously, I would like to estimate a reasonable TBO.  Has any
calculated a TBO for their turbo?  Am just trying to balance the pros and
cons of continuous turbo operation.

Continuous pros:
Increased fuel efficiency
No need for tuned intake (?)
No complex muffler

Continuous cons:
Rebuild turbo more frequently
Lower engine TBO (?)


Any thoughts?

Thanks,
Dan Ruggirello