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Date: Wed, 10 Feb 2010 20:54:52 -0800
From: Don Wallker <drwalker@gbis.com>
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To: flyrotary@lancaironline.net
Subject: reply to turbo thoughts
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Ed, I've thought about all this things from your earlier postings and 
it's been very helpful eliminating possibilities and for understanding.  
Well, at least the beginning of understanding.

Lynn,  I have no idea what a homogenizing muffler is.  Explanation?  
Since I'm not modifying the port timing, changing to earlier rotors with 
counter weights, I think the thing to do is to turbo it.  I like your 
idea of a huge compressor with no waste gate.  A few pounds of boost 
with a large volume.  Seems Mazdatrix has abandoned the turbos for a 
supercharger that does just that.  6 lbs of boost with the low end model 
and 12 lbs for the bigger.  Any idea who makes a turbo like that? Or a 
supercharger that is small and will hold up to continuous use?

Lynn,  My water at 185 f and oil at 205 f was at WOT at 8000ft, prop at 
2450 and engine at 6980RPM.  Yeah, the oil is high.  I may be having the 
situation that Tracy spoke of.  Back pressure inside the cowl due to the 
radiator having less restriction than the oil cooler.  At high speed, 
the cowl flaps don't help.  Better than it was though.  When I back off 
on the throttle, it drops fast, although I don't remember how much.

Dave, thats a lot to think about considering turbos are new to me, but 
then rotary aircraft power plants were too, so this is easy in 
comparison.  My RPM cuts out at about 6000rpm too.  I tried capacitors 
as Tracy suggested, and it helped, but will probably get a stand alone 
digital display.  Am using an optical prop tach mounted on the glare 
shield for prop RPM.  Concerning the Burns Muffler.  They have a new one 
out with fine Stainless Steel shavings as the packing.  Probably like a 
course Stainless Steel wool. Did you try it that way or with the regular 
packing?  They say it is holding up for the Rotary racers.  If I do this 
I will get a slightly larger oil cooler and mount it under the engine 
with a scoop.

Ernest, That is an interesting and elegant idea.  Using what is already 
there.  Do you have drawings or pictures?  I think I understand it 
except for where the air is coming into the center of the impeller.  Is 
it through the thick mounting plate that has the PSRU bolted to it? 

Don Walker
N113BR