REFLECTOR: Running LOP
Sid Knox
sbjknox at earthlink.net
Sun Dec 17 09:14:44 CST 2006
When I modified my injectors, I used one of those small, round file-like
tools (I don't know the official name) that are used for cleaning the tips
of an Oxy-Accl torch.
I had not thought of using small drill bits ( I have a bunch of small
carbide printed circuit board drills) but it sounds like they will do a good
job also.
The first injector I opened-up, being cautious and not wanting to take out
too much, I took a few light strokes and collected the tiny filings on a
piece of paper so that I could see how much brass I was removing and how
aggrssively I could safely wield the "file". Then, make a flow measurement
on the flow-bench. Repeat until I had the flow that I had calculated I
needed for that particular injector. Then, re-assemble, fly, take data, and
repeat as required for all three injectors. Three, because one of the four
will be the "reference" injector.... the one that is running the richest and
therefore need not have its orfice enlarged ... unless I screw-up and go too
far with one of the others. Then it becomes the reference and the other
three have to be re-done. Fortunately, I did not have that happen.
Not a difficult process but quite tedious ... especially the removal and
replacement of the cowling... but well worth the effort to be able to run
cool and clean and *economical*... at 50 or 60 deg F LOP.
Sid Knox
Oklahoma
Velocity 173 RG N199RS
Starduster N666SK
KR2 N24TC
W7QJQ
----- Original Message -----
From: "Dave Philipsen" <velocity at davebiz.com>
> I've had my injectors out and I experimented with some miniature drill
> bits just to see how they fit without actually drilling the orifice. In
> doing so, I did find out that some of the injectors fit the drill bit
> snugly as I slid it in and others had notably more "play" indicating
> that they weren't all *exactly* the same size. I would imagine the
> difference was less than .001 inch though.
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