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The turbo I bought, after much consultation, was a GT4088
journal, with a 1.06 A/R. Also got a 15# Tial wastegate, and a Tial
pop-off valve for the induction side which I plan on using both. Bought
some extra springs also, for ground testing. The Garrett rep and George at
ATP told me that the journal was a better situation in my application, because
it wouldn't destroy the turbo if it wears, whereas a roller bearing, if it goes,
could be a disaster. More will be revealed at ground testing, which will
happen after I get the belly scoop mounted, along with the radiator and oil
cooler. Next couple of weeks are busy ones......
Greg Ward
Lancair 20B N178RG in progress
----- Original Message -----
Sent: Tuesday, June 24, 2008 8:44
AM
Subject: [FlyRotary] Re: Turbo burned
up
Scott,
Curious to know if the .61 A/R is the turbine housing A/R
?..........I have heard the opinion
that a A/R of closer to1.0 or more might be better for our a/c use to
prevent over speed at
altitude (John Slade just reported his turbine A/R is .96)..........John
has 50+ hours on his
TO4..........I do not remember hearing how many hours Greg Richter had on
his TO4 before
going pure jet.........Paul Yaw (Arizona Rotary Engine Guru)
even recommended a turbine
A/R up to 1.3 on info I have seen........Your .61 A/R will
definitely spool up faster (That is
why automobile turbos have the lower A/Rs (to reduce turbo lag on
acceleration) but may
tend to over speed at high altitude.........The nice thing about it is
that turbine housings with
a different A/R are available for retrofit and relatively
inexpensive...........Your installation
sounds well thought out........Looking forward to seeing
photos...........FWIW
--
Kelly Troyer
"Dyke Delta"_13B
ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifold
--------------
Original message from SHIPCHIEF@aol.com: --------------
Dave;
Sorry to hear about the
Turbo...
I ran my engine again today after working on air guidance
for the oil and radiator outlets.
I'm running a Turbonetics symetrical
TO-4 turbine with Inconel turbine wheel. It has a 60-1 compressor, P trim
and .61 A/R. I hope it will withstand the heat.
Greg Richter was
using the same when he had a 13b in his cozy. I talked to him one day (so
long ago) and he reccomended it, so that's what I got. I suggested some
model of waste gate and blow off valve, but he said to forget about it
unless operating it indicated a need.
I built up the exhaust
manifold from two 2.5" .060 wall 321ss elbows curved up to the turbo flange
in a short fat 'Y' to hold the turbo close to the engine. Then I welded in
2" to 1.75" nozzles in the engine flange ehaust ports to keep the exhaust
blast away from the flange welds to the 2.5" tubes that support the turbo
weight. I added two 1/2" ss straps between the flang tops for 'suspenders'.
So far I have only run up to about 3500 rpm because I don't trust myself
or the strap tying the tailwheel spring to a cedar tree. My highest exhaust
temp is already over 1200 F.
I'm using a CATTO 2 blade left hand
equivalent for a 180 Hp O-360 prop. We figure it will be right for the test
flights and absorb 200 Hp @ 2900 RPM. Any more power would be risky for the
RD-1A gearbox, so I have not added an intercooler yet either.
I'm waiting
for the summer air show season to get over before I send the ECM and EM to
Tracy to figure out why they dont talk to each other...He's bound to be busy
now, and I can still run my engine to test cooling and other issues, what
ever they may turn up to be.
I tried to post pictures of my turbo setup
on the FLYROTARY list, but they didn't go thru. How do I reduce the size
of picture to file the file limit?
Oh, and you can upgrade my file
on your rotary roster to 'ground running'.
Regards;
Scott
PS I
would like to suggest that all of you post something about your ROTARY
project on YOUTUBE and add FLYROTARY to the title or keyword list, then we
can all quickly identify video posted by one of "our
own".
**************
Gas prices getting you down?
Search AOL Autos for fuel-efficient used
cars.
(http://autos.aol.com/used?ncid=aolaut00050000000007)
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