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Sounds like a good match, Greg - a larger A/R of 1.06 is best for producing aircraft power. Smaller A/R's rev cause the turbine to rev faster, but tops out quickly and then limits exhaust gas flow through the turbocharger - Ok for that "sports car" feel but not what you want for long duration boost in an aircraft.
Garret has lots of experience with aircraft turbocharging unlike some of the other turbo manufactures, so their advice should be on the money. Let's see those photos!
Ed
----- Original Message ----- From: "Greg Ward" <gregw@onestopdesign.biz>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Thursday, May 29, 2008 11:20 PM
Subject: [FlyRotary] Re: [FlyRotary]Turbochargers
Gentlemen (and Ladies);
Just got in. Spent about 3 hours with one of the top rated turbo outfits in the State this afternoon, and got a Garrett GT4088 Journal Bearing, 1.06 A/R, (GT40-SPCL-4088-NBB), along with a Tial 44mm V44 wastegate. Also an Edelbrok 75mm throttle body, and all of the Stainless, flanges, etc. Met with the Garrett rep that was in-house at the time, and he said that 15lb. of boost, with a boost controller would be all that I needed, and it would be loafing at that......(:-) This outfit has dynoed the 20B on about 8 installations, and they said that I would have a guaranteed 400-450 hp at take-off, and with the prop that Craig Cato is building for me, I think I've got a rocket ship here......++(:-) Damn thing is heavy, and with 3" stainless exhaust, I'll be moving some batteries I think. Rep says that the noise level in the cars they have set up is LOW, won't need a muffler. Think I'll run this up on the Rotary site too, getting excited, pictures are coming in the next week or so.
Thanks;
Greg
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
On Behalf Of Tracy Crook
Sent: Thursday, May 29, 2008 9:40 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: [FlyRotary]Turbochargers
I get 3 - 5 emails or calls every day from builders surprised that
things don't seem to be fitting together. There seems to be some kind
of expectation that the whole world is standardized around this one of a
kind
airplane they are building. Don't *expect* anything to fit unless you
have
verified it or made it fit yourself.
OK, enough kvetching from me.
It doesn't make sense to throw away those $250 injectors (Mazda price) and
buy something to fit those little chunks of aluminum you bought. Put the
injector bungs in a lathe and turn them out to fit. Or start with a
fresh chunk and make from scratch.
I doubt you could replace those rather unique 20B primary injectors no
matter how badly you wanted to. Again, the world is not standardized
around that very rare orphaned car engine you are putting in the plane.
Tracy
On Thu, May 29, 2008 at 3:18 AM, Greg Ward <gregw@onestopdesign.biz>
wrote:
Hey Tracy;
The injector bosses from SDS arrived today, and the Mazda injectors
don't fit (big surprise). What do I use instead, and what size?
Should I also replace the ones in the block, or go with them for a
while? Will this make any difference in the ECU mapping?
Thanks;
Greg
----- Original Message -----
From: Tracy Crook <mailto:tracy@rotaryaviation.com>
To: Rotary motors in aircraft <mailto:flyrotary@lancaironline.net>
Sent: Wednesday, May 28, 2008 10:54 PM
Subject: [FlyRotary] Re: [FlyRotary]Turbochargers
AFIK, Tom Parks is the only other 20B turbo flying (very few hours).
I don't know the specs. or even the make but I think it was a Turbonetics.
Ain't it fun being a pioneer? :>)
Tracy (admiring my painted -8 fuse)
On Wed, May 28, 2008 at 1:40 PM, Greg Ward <gregw@onestopdesign.biz>
wrote:
I need to know what turbos you guys have had the best experience with
on 20B's. I have to go buy one quickly as my welder guy is moving
faster than I thought. The suppliers are only guessing. I plan on
using a manual wastegate, and a 90 mm throttle body. HELP!!
Greg Ward
Lancair 20B in accelerated progress
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3.8 Hours Total Time and holding
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