Tom,

 

Have you run the Gami Lean test? http://gami.com/ 

 

You may be just fine.  GAMI's approach is to better balance the fuel/air ration so that all the cylinders are producing the same power in the flight regime where you spend the most time.  The lean test looks at the fuel spread amongst the cylinders and will correct any gross disparity by altering the size of the offending cylinder's injector.  Of course, if you are not injected, the problem is more difficult because of the inherent different in air/fuel distribution.  Injectors open to the upper cooling plenum can see different pressures, thus different atomization effects.  Anyway, run the lean test and report back.

 

Grayhawk

 

I have been chasing a problem with my EGT's and have hit a wall.  My #3 EGT is about 80 degrees above the rest of the cylinders.  It also has the highest CHT, but only by 10 degrees over #4.  Yet #4 has one of the coolest EGT's...  #2 is the first to peak while leaning.

So how many gallons did Jimmy have left in his bucket after Jane....   Just kidding.  Sounded like a math quiz.

A better way to explain it, see graph below.

http://www.n54sg.com/images/egt.jpg


I have done everything I know to do and can't seem to figure it out.  I have switched injectors from #4 and #3 thinking the injector may have been the problem.  Didn't seem to change anything.  I have done my best to check for a leak in the intake system.  Couldn't find anything. 

Attached is the data that goes with the graph.
It is a Superior XP-400SRE prototype so I don't exactly have anything to base my data on. 

Anybody have any ideas?
Tom McNerney
www.N54SG.com

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