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From: "Marvin Kaye" <marv@lancaironline.net>
Subject: Re: [FlyRotary] Re: Turbo post mortem
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
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Date: Fri, 09 Jul 2004 10:45:46 -0400
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"John Slade" <sladerj@bellsouth.net> wrote:

"""
> That doesn't sound right.  How big is the wastegate, and what style (ie,
> throttle plate or Delta-gate (or Race-gate)?
  I don't know what a deleta gate is, but the stock wastegate is a flapper. It
  doesnt work very well and needs widening.
"""

The Deltagate and Racegate style wastegates both use a poppet valve to allow 
the exhaust gas to bypass the turbo.  The gas takes a rather tortuous path 
aound the valve and, I suspect, cause quite a bit of back pressure.  The Rajay 
unit typically found on aircraft engines (TSIO whatever) is a throttle plate 
style wastegate that, IMHO, probably flows the wasted gases much more freely. 
 Turbonetics has come up with a new unit that looks really nice, called their 
Newgen, and they claim 50% flow improvement with it vs the poppet styled 
valves... you can read a bit about them on the Turbonetics website.

      <Marv>