Does a large EGT spread indicate fuel injection imbalance?

bnesheim

I have a 1972 Cessna Hawk XP II (R172K) with a Continental IO-360KB. I've been uploading my flight data to FlySto and it points out a signifiant spread in EGT for a couple of cylinders at lower manifold pressure. In particular #1 and #2 are routinely quite a bit lower. Seems to me that this might indicate a fuel delivery imbalance. I also have some challenges with keeping CHT for #3 below 400 on extended climb outs which also make me suspect an imbalance. Does anyone thing that GAMI injectors might help with this?

planewrench

Based on just your snapshot here it's almost impossible to do much troubleshooting. Yes you have a big spread on one and two but as you indicated that's at a low manifold pressure so I'm going to assume that's off idle at about 12 to 1,300 RPM?

This series of engines is not known for good mixture balance especially at low RPMs. If you had this a cruise I'd be a little more concerned.

And 400 on CHT is still not too bad especially in climb. Lots of owners would love to have a temperature like that incline. Lol My questions would be when was the last time the fuel system was set up and checked, condition of spark plugs, timing there's a whole host of questions that would have to be answered. Induction leaks, sniffer valves. Condition of baffles. If that fuel system has not been checked and set up in recent memory it's probably time to at least start with a known baseline fuel pressure system.

And no my feeling would be gammies would not be an option at this point. Carl