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Yeah. I've been off the list for about 9 months and missed your posts. Before I
left, I wasn't that interested in turbocharging. While I was "on sabbatical" the
notion developed that a turbocharger is the most effective muffler available for
a rotary - with the collateral benefit of boost :o) I would simplify (the
mechanical aspects) by using independent levers for throttle and wastegate, but
aside from that I am right there with you. Rusty tells us that there is -some-
boost is there even with the wastegate wide open but that is manageable. The
arrangement of using boost last - after WOT is reached - will minimize
intercooling requirements. I like your pop-off valve that goes at an absolute
MAP and not some over pressure.
We seem to be on the same page .... Jim S.
Marvin Kaye wrote:
> Jim Sower <canarder@frontiernet.net> wrote:
>
> >>>I would have a manual internal waste gate. The waste gate would
> be normally open (dumping all exhaust past the turbo). On
> takeoff, I would run WOT (say 29"), no boost. I could close the
> waste gate a little and get 33" for example for a hot day or
> short field. As I climb out at WOT, I gradually close the waste
> gate to maintain 30" MAP. ...<snip>...<<<
>
> I have outlined essentially this same system here several times during the
> last few years, as it is the simplest and probably the least complicated way
> (read less plumbing and parts) to get the job done. My intention is to setup
> the throttle lever so 50% travel gives me WOT at the throttle body. As I
> further advance the throttle lever the wastegate begins to close and brings
> the turbo online. With the throttle lever wide open the wastegate will be
> fully closed. The popoff on the intake manifold is referenced to MAP and not
> boost, and set to blow off at my intended 34" MAP redline... this way the
> overboost protection is unaffected by ambient pressure. Just thought I'd
> share this once again as it's a hot topic revisited.
>
> <marv>
>
> >> Homepage: http://www.flyrotary.com/
> >> Archive: http://lancaironline.net/lists/flyrotary/List.html
--
Jim Sower
Crossville, TN; Chapter 5
Long-EZ N83RT, Velocity N4095T
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