High #3 CHT and cold #4

[ERJDriver]

fresh rebuild IO360A1A dual PMAGs with jumper, timed 2 teeth past TDC with about 10 or so hrs on her.

New everything, having to push 12.5GPH to keep number 3 below 380-385 in cruise. Only way I can keep it cool is to LOP

Have the washer in number 3 baffle, everything sealed with RTV, front baffle block offs in front of 1/2.

Cooling ramps installed on top cowling, but the sides aren’t sealed if that makes sense, it’s just the ramps glassed to the cowling.

#4 is running 310 when #3 is pushing 380, oil cooler mounted on baffle behind #4. EGTS way lower on 4 also


Thinking the lower baffles may be too tight around the cylinder not allowing airflow, but previous to overhaul I didn’t have such a big issue. Any tips?

Pics attached, LOP/ROP

 

[Carl Froehlich]

Mag checks good? EGT rise on all cylinders during the mag check?

I would do a quick GAMI check to see if you have a lean cylinder as the first step. If so, then round up the usual suspects and run it to ground.

Carl

 

[D-Dubya]

I'm having random thoughts, but I'll add to Carl's queries...do an in-flight mag check and see if one of the ignitions provides different values than the other. How certain are you that the timing was set correctly? Are the P-Mags new, or just put back on the rebuilt engine? Is the plane new to you? If you built it once before and are familiar with what's "right", it narrows the list down of things to ask. Especially when it comes to baffles and baffle seals. If this is all mostly new to you, then there are a plethora of questions to ask. BTW, the EGTs look lower than I'd expect when you're ROP.

 

[lr172]

Look at pic 2 - the lop one. Egts ALL over the map - 1100-1400. Think you have issues with fuel injector balancing. In pic 1, chts 1-3 are pretty normal and well grouped. 4 is way low, but look at the egt -100* cooler. Again fuel distribution.

I would start with injector flow balancing instead of cooling air issue.