Attempted a Gami spread check the other day trying to determine whether #4 is running leaner than the other cylinders, as the indicated temps would suggest. 190hp Titan XIO 360. 140 hrsTT..
Long story short I started at 10 gph (extremely ROP) and recorded temps (EGT CHT) and fuel flow in .5 gph segments all the way through peak and best LOP (7 gph). Was advised that the fuel flow changes were too wide and should have been done at .2gph increments. I was at 6500 msl and 24 square on the power. OAT was 54*
The point here is that I spent a lot of time in Mike Busch's "red box" which he believes is extremely unhealthy for the engine. I understand the theory of the "big pull" technique for leaning. Considering the required time for the temps to stabilize, I'm not inclined to go back up and put my motor in the red box in this lengthy procedure again .
My question is there no other way to determine whether or not there is an even fuel distribution by my Bendix injection system. I will certainly pull the nozzle to see if there is an obstruction.
I'd be grateful for comments
Long story short I started at 10 gph (extremely ROP) and recorded temps (EGT CHT) and fuel flow in .5 gph segments all the way through peak and best LOP (7 gph). Was advised that the fuel flow changes were too wide and should have been done at .2gph increments. I was at 6500 msl and 24 square on the power. OAT was 54*
The point here is that I spent a lot of time in Mike Busch's "red box" which he believes is extremely unhealthy for the engine. I understand the theory of the "big pull" technique for leaning. Considering the required time for the temps to stabilize, I'm not inclined to go back up and put my motor in the red box in this lengthy procedure again .
My question is there no other way to determine whether or not there is an even fuel distribution by my Bendix injection system. I will certainly pull the nozzle to see if there is an obstruction.
I'd be grateful for comments
Last edited: