one cylinder high EGT

[johnpaul44]

Lycoming O-360-A1A
10–4164 carb
dual p-mag
fixed pitch

Im trying to chase down a single egt that is high only a full throttle so far i have:
replaced egt probe
all new plugs/wires
replaced all intake tubes, new intake flanges, new gaskets with permentex added to gaskets

at full throttle only my cylinder 1 egt will spike to 1350 or so degrees while the other remain the same. As soon as i reduce from full throttle the egt begin to even out. when running lower power and leaned out egt spread is very close.

see the savvy report below: i tried a lean, rich , lean test at constant MAP at altitude and all egts were about a 300 degree spread or so

https://apps.savvyaviation.com/flights/shared/flight/7526260/d8820ce2-ba6a-463c-9274-cc4198de44c7

whats going on here?

 

[Pilot135pd]

Have you stuck a camera in there and moved the prop to check what the valves in that cylinder is doing?

 

[YellerDaisy]

I'd also check plug leads and change plugs (especially since they are so cheap). One plug not firing will result in a high EGT as the gases are still burning on their way past the EGT probe.

 

[Avanza]

The carburetor supply liquid fuel to the air stream.
The weight (mass) of the fuel is much heavier than the air.
With increased air velocity the distribution/ mixture of the fuel to the cylinders will be less exact with a carburetor. You could try with a larger main nozzle.
This will increase the fuel flow but will not change the distribution much.
A fuel injected system will provide better fuel distribution to each cylinder.

Good luck

 

[gasman]

At full throttle, try pulling carb heat and see if there is a change.... Wait for it. That may give you a clue.