Paul,
           Finally a noise!  I think I overdid the rust inhibitor by the
blue smoke.
The next day I actually ran it again without the audience, and find the
motor runs
“rough” between 1800 and 2200 rpm.  I suspect it is a rich mixture as the
A/F is
reading about 10.5 to 11.5.  The exhaust gas is about 1350 degrees and so
far have
not much else to go on.  Waiting for a new chip from tracy which will be a
few weeks
in which time I will finish the cowls.  Has anyone experience or advice re
the “rough
running” ?  It almost seemed like a backfire or a miss.  Too much to take in
at once,
but am leaning to buying tracy’s recorder so I can find what is happening


http://www.youtube.com/watch?v=hSNBFLuZSK4

Neal Unger in the Oz outback

Good work Neal. Sounds real strong. Be careful when you shove the power in
for the
first flight. It will want to head for the fence :) Also keep an eye on that
flex plate.

Rough running is common until you get it tuned. Does it sound like gear box
chatter?
If so up the idle speed to 2000 or so. That is the 2.85:1 so real prop RPM
will only
be 700 RPM at 2000 engine RPM.


Paul Lamar

Hello Neal
Good shot, mate! I really must make some time to come and see you. The plane
looks great.
Erik in Parkes, Oz.



Paul,
           Definitely not g/box chatter, but as I said my immediate
suspicion is mixture for when I turned the mixture knob fully anti clockwise
it definitely improved.  Have been running around the 2000 rpm and does that
prop (fixed pitch prince prop)  shift some air!  Have a very clean hangar
now with spiders busy rebuilding their webs.  The rads appear to work well
with the max temp at 2200 rpm was 125 degrees on oil and water.  Yes too
early to get excited, but it is certainly looking good.  Neil.

All good news Neal. Wait till it hits 7500 RPM for shifting air :)

Paul Lamar
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