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Hi CHT with 0.0 gami spread
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Andrew Anunson
My Bendix injected Lycoming O-360 (COZY MKIV, built to plans, 1 LSE EI, 1 mag) is running hi CHT's on the #4 cylinder (see CHT and OIL TEMP image). On the ground, not moving, the CHT's are all pretty close (see GROUND CHT image). During taxi and climbout, the #4 leaves 1, 2, and 3 in the dust (see TAXI and CLIMB image) The GAMI lean testing shows a spread of 0.0 to 0.5 gph (see images GAMI 1 and GAMI 2 images) It appears to be an airflow balance issue. What are the first steps to take? Open up baffling for #4 cylinder? Tighten baffling for #1, 2, and 3? Air deflectors? Thanks, Andrew Anunson Cozy MKIV #1273 Pound, VA
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Roch LaRocca
You probably just need a ramp in the cowling or similar. I have a ramp for my #3 cylinder as well as a short “wall” that channels some other air flow. Sometimes you have to work with it.
Rock L.
On May 18, 2022, at 18:53, Andrew Anunson via groups.io <macleodm3@...> wrote:
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Steve Rothert
Andrew,
At what speed do you climb out? Try climbing about 10mph faster and see how the temps behave. If you have a NACA inlet, do you have a "diffuser" to slow down the air? After a lot of "encouragement" from Terry Schubert and others, I built one for my 0-320 Long-Ez. The CHTs balanced out. #3 and #4 CHT did not rise as fast on climbout. My $.02 worth Steve
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Tim Andres
Start with a CHT probe calibration. Put all 4 in boiling water . Also I believe #4 is almost always the hottest cyl on these planes. Look for anything under that area that might trip the airflow, something that might create turbulence. I had a bracket for my cabin heater that I believe was leaking a disturbance in the force” A redesign of that helped in my case. I would also try opening up the gaps in the cyl head baffles. Good luck, doesn’t look too bad overall though. Tim Andres
On May 18, 2022, at 11:53 AM, Andrew Anunson via groups.io <macleodm3@...> wrote:
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skovbjerg
I will suggest one action at a time. Open below cyl 4 and be sure to close around the head on top. Then onto the others. This is what I am looking at right now. WOT / ROP climb to 8,500, then lean to LOP around 65% cruise:  
On May 18, 2022, at 11:54, Andrew Anunson via groups.io <macleodm3@...> wrote:
My Bendix injected Lycoming O-360 (COZY MKIV, built to plans, 1 LSE EI, 1 mag) is running hi CHT's on the #4 cylinder (see CHT and OIL TEMP image). On the ground, not moving, the CHT's are all pretty close (see GROUND CHT image). During taxi and climbout, the #4 leaves 1, 2, and 3 in the dust (see TAXI and CLIMB image) The GAMI lean testing shows a spread of 0.0 to 0.5 gph (see images GAMI 1 and GAMI 2 images) It appears to be an airflow balance issue. What are the first steps to take? Open up baffling for #4 cylinder? Tighten baffling for #1, 2, and 3? Air deflectors? Thanks, Andrew Anunson Cozy MKIV #1273 Pound, VA <CHT and OIL TEMP.PNG> <GROUND CHT.PNG> <TAXI and CLIMB.PNG> <GAMI GROUND.PNG> <GAMI FLIGHT.PNG>
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