Bill,
Sounds like a good tech article on the TBI for the news letter too. I have
drilled 2 more holes in the static tube, the first 1" back from the original
on the opposite side and another 2" rear of the original on the same side.
My TAs and Avg ground speed are now right on. I think Tex was on to
something and the change to your static tube seems to be the same adjustment
N327AL needed. I will try on one of our other Lightnings as this may have to
be added to the build manual.
Nick
-----Original Message-----
From: owner-lightning-list-server@matronics.com
[mailto:owner-lightning-list-server@matronics.com] On Behalf Of Bill Strahan
Sent: Wednesday, November 18, 2009 12:24 PM
To: lightning-list@matronics.com
Subject: Re: Uneven EGTs at full throttle
Well, after experimenting quite a bit and flying a couple of hours in
different configurations, here's my latest conclusion on my uneven fuel
distribution: I've ordered a Rotec TBI. :)
My flight with just the radiator hoes was awful.
After some more research, I tried modifying it with an .025 aluminum insert
along the 90 degree bend to stop any rotation and to help it around the
corner. That produced results better than the original SCAT tube but still
very uneven.
Then I inserted another short piece of aluminum at 90 degrees to the first
to hopefully kill any rotation and get everything lined up before the carb.
Results: Even better, slightly, but still not acceptable.
I have essentially tried 4 different tube configurations to get the air from
the filter box to the carb, and while I have produced varied results, I have
not addressed the original problem to my satisfaction.
I spoke with the tech guy at Rotec, who said they had experienced similar
problems with the Bing, and while it was a great carb it was very sensitive
to slight imbalances and swirl in the flow. And he assured me their TBI was
much less sensitive to those issues.
I'll post under a new thread when I receive and install the Rotec unit.
Fingers are crossed.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=273561#273561
