Rob,
Sorry this has taken so long to get back to you.
My #5 cylinder does not have a crack! It was the baffling
vibrating on the forward part of the barrel fins that “made” fine
aluminum dust that looked just like exhaust residue.
Lancair has not put out the word, but they have made a
change to the fast build baffling to allow #5 to cool better, and maybe #6?.
I just moved my right front baffling forward (by elongating the top outboard
bolt hole at the aft end near #5 cylinder) about 1/16th of an inch
to allow air flow down past the forward part of the fins on #5 and will test
fly it to check temperatures. Lancair has now started drilling a hole in
the face of the baffling, but has not put out dimensions for all those of us
who preceded this fix. I’m more than a little disappointed in Lancair
for not disseminating this information, as #5 as you know, is the hottest
cylinder with their fast build for all of us who preceded this fix. I
intend to get pictures and look at the size and placement of this “fix”
, and whether they did same to the other side for #6.
My engine roughness during leaning was due to clogged
injector/s.
I pulled all my injectors and cleaned them………….what
a difference, and you would not believe the junk I found in them. Sludgy
sticky mess! It came out easily after soaking them in Hoppes #9 gun
solvent. You will have to make a tool to get them out and then properly torqued
back in. Torque is 55-65 inch pounds on both the attachment nut for the
gas line and the injectors themselves. I took a Craftsman deep well
socket (the only one I could find that was open up inside and not reinforced
with thicker walls high up in the socket , then cut it in two and took out a
section to make it shorter. Then, I ground out the inside of the top
section to allow room for the top of the injector and welded it back
together. Next, I ground down two sides almost to nothing, and that
allowed me to torque the injectors properly………but not without
a lot of tedious work since the socket would not turn more than just a little
because of the proximity of the intake manifold flanges. You will need a
3/8 crow foot to torque the nut at the top. TCM does not have a tool, and they
take the intakes off, which necessitates new gaskets and a lot of work. I
like my little tool better!
Ron