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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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 Posted: Fri Aug 24, 2012 2:51 am Post subject: Newest GAMI lean test...probably off-topic for most |
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It is CCW...based on nothing in particular. When I built it, I was
trying to get fuel away from the #1 intake tube, because that
cylinder has always been a "cold" cylinder. As it turns out, I had
been chasing my tail trying to warm that cylinder up, and subsequent
readings have shown that you can't always get the same exact readings
from all the cylinders, so I quit chasing that dream. All my
cylinders exhibit the same color of plugs, the exact same color of
the exhaust pipes, so I stopped worrying about that one"rogue" cylinder.
My idea in making 5 blades in the swirler and mounting it with the 4
bolts was that if I wanted to try to change the relative positions of
the deflector blades to the intake tubes, I would get a positional
change if I took the swirler off and repositioned it one bolt at a
time, the incoming charge of air/fuel would be "aimed" a bit
differently each time. But it turns out that I never had to try to
change the position at all....it just worked pretty well, and I left
it at that. Truth is, I had forgotten that I had installed that in
June, and had been having no problems since I gave up on trying to
chase that elusive cylinder....which wasn't elusive after all, just
reporting different numbers for EGT than the rest. The CHT's have
been fine all along.
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062
Prince prop 64 x 30, P-tip
Electroair direct-fire ignition system
Rotec TBI-40 injection (sleeved to 36mm)
Status: flying with 1336 hrs... (since 3-27-2006)
On Aug 24, 2012, at 6:32 AM, FLYaDIVE wrote:
| Quote: | Lynn:
Which way is the swirl pattern in the carb throat, clockwise or
counter clockwise?
And how did you determine it?
Barry
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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM |
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jimcarriere
Joined: 27 Aug 2006
Posts: 22
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| Posted: Sat Aug 25, 2012 11:01 am Post subject: Re: Newest GAMI lean test...probably off-topic for most |
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Barry,
It is also with a laugh and tongue-in-cheek that I offer my own two cents to your comments.
"Rotec" is an Australian company who has been selling radial engines, of their own design, for approximately twelve years. About five years ago they introduced another product- a "throttle body injector" (although some people consider the design better described as a slide carburetor). They market that product line as the "Rotec TBI." The Rotec TBI was originally intended for Rotec's own engines but it is also marketed for Jabiru and many other engines. Their products have been featured and advertised in many light plane magazines for over a decade. One of their engines was installed and flying on an airplane that flew to Oshkosh 2002 (yes, 2002, ten years ago) and Rotec the company has been attending the Oshkosh show for at least that long. Rotec has had a very good and informative website available for several years.
"Rotax" is an Austrian company who sells engines that are popular in light aircraft. They also sell engines for non-aviation applications. Some examples of their common engine models are the 582 and 912 series. Some Rotax engines are also used in military UAVs. Strong opinions on Rotax engines vs other aero engine marques abound with religious fervor, just like opinions on automobile marques among racing fans. Rotax has also had a first class website available for a long time.
Please note that "Rotec" and "Rotax" are completely separate and unrelated companies, although some of each company's products compete in the same markets. (By the way, the countries where each company are based, "Australia" and "Austria" respectively, are also completely separate and unrelated countries... note that both countries may be found in any world atlas published in the past several decades and no doubt both have popular online groups too!)
"RATAX" is a new one for me...??? Regardless, I believe the topic at hand is a "Rotec TBI" on a "Jabiru" engine, not "Rotax," "Ratax," "Rotex," "Rotox," "Botox," etc.
[quote="BARRY CHECK 6"]Doug:
It with�tong�in cheek, I have to laugh when you say "work your way through". �I joined the RATAX group to gain some insight. �But, instead I gained some track shoes to run away from RATAX as quick as�possible. �They have so many problems it is amazing anyone would even consider that engine. �Yet, the they brag about the military using them on UAV's... Sure the military can... They have unlimited funds to keep them running.
Barry
On Wed, Aug 22, 2012 at 5:02 PM, <kayberg(at)aol.com ([email]kayberg(at)aol.com[/email])> wrote:
[quote] Glad to hear things are going well for you, Lynn.� Others have not been so lucky with the Rotec contraption.�� At least two other people that I know have tried the Rotec and tossed it.� Granted, it was the 3300 Jab, but the engines never ran right and were not reliable enough to fly with.
�
To others who are considering the Rotec, be prepared to work your way thought some disappointment.
�
In my opinion.
�
Doug Koenigsberg
--[/quote]
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