#1 Rear Still Hot

[edasmus]

Are we positive the CHT is really 400....?? Just a thought here but have you tried swapping the CHT probe from the suspect cylinder to another cylinder and vice versa? Are these the same probes in the exact same locations from the previous engines? It would be an interesting experiment nonetheless. If swapping probes leads to the same temps, then you know the 400 is valid.

I know another favorite of Mike Busch is to check the flow of the injector for that cylinder. Maybe that single injector is all jacked up. Just a thought....

Good Luck my friend!

I feel your pain.

Ed

[tomcomet]

Originally Posted by edasmus

Are we positive the CHT is really 400....?? Just a thought here but have you tried swapping the CHT probe from the suspect cylinder to another cylinder and vice versa? Are these the same probes in the exact same locations from the previous engines? It would be an interesting experiment nonetheless. If swapping probes leads to the same temps, then you know the 400 is valid.

I know another favorite of Mike Busch is to check the flow of the injector for that cylinder. Maybe that single injector is all jacked up. Just a thought....

Ed

We have tried changing probes and the high heat issue does not move so it is not the probe. Yes, checking the injector is one of the next things on our list, however, these are all new GAMI injectors and that same cylinder had similar heat issues on the old injectors so not sure if that is going to help.

[edasmus]

OK, I was hoping you had the same old probes in the same locations on the new engines as in the old engines. If that were the case, I thought a likely probe issue but that would appear not the case based on your probe swapping attempts.

I agree it is probably unlikely your new GAMI injector has an issue but it would still be worth verifying. It's not impossible.

I'm guessing you have a relationship with Savvy Maintenance and Mike Busch.?.?

What do they say about that cylinder temp and what to attempt to do to solve the problem?

[DrDave]

A picture of all of the baffling around the engine would certainly be helpful.

Dave

[tomcomet]

Originally Posted by DrDave

A picture of all of the baffling around the engine would certainly be helpful.

Dave

I have a few but they are not great. Will take all the cowl covers off and do full pics soon.

[DrDave]

Originally Posted by tomcomet

I have a few but they are not great. Will take all the cowl covers off and do full pics soon.

It is quite helpful to have a bright drop light in the lower plenum area and look for light leaks around the baffling and all of the poorly sealed areas around the motor. Look closely to the area across the top cowling where it is scalloped. I'm going to devise a fix for that. I'll send pics when I do.

Dave

[kilr4d]

Originally Posted by edasmus

OK, I was hoping you had the same old probes in the same locations on the new engines as in the old engines. If that were the case, I thought a likely probe issue but that would appear not the case based on your probe swapping attempts.

Also need to check the continuity of the wire from the rear probe to the panel. It's entirely possible it's chafing the way that cyl temp jumps around.

Also should put the factory cht probe on the #1 cyl to confirm temps.

[kilr4d]

Originally Posted by edasmus

Are we positive the CHT is really 400....?? Just a thought here but have you tried swapping the CHT probe from the suspect cylinder to another cylinder and vice versa? Are these the same probes in the exact same locations from the previous engines?

Originally Posted by tomcomet

We have tried changing probes and the high heat issue does not move so it is not the probe. Yes, checking the injector is one of the next things on our list, however, these are all new GAMI injectors and that same cylinder had similar heat issues on the old injectors so not sure if that is going to help.

Going forward with this thought, has anyone tested the continuity of the wire from the rear engine to the panel?

Did they re-use the harness from the old GEM or lay in a new harness?

[kilr4d]

Also, I neglected to mention rigging in my previous posts. Crucially important that pushing the mixture lever forward pushes the mixture control on the pump to the forward stop.