REFLECTOR: Franklin EGT

[Grover McNair]

The key is to find the peak EGT. Then lean or richen accordingly. Usually 50
to 100 degrees F either side of peak. The EGT will come down on either side
of peak. Fuel flow will go up Rich of Peak and down Lean of Peak. Monitoring
cylinder head temp is important as well. Max for the Franklin is 392F.
Running ROP will cool the cylinders while LOP tends to run hotter on the
CHT. Running at peak will produce the most heat (and the most power). It
also has the highest likelihood of causing detonation. 

I have just installed a JPI 740 engine monitor in N832AB. It is getting a
conditional inspection and should be flying again soon.

Grover McNair

173FG 

 

  _____  

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of aminetech at bluefrog.com
Sent: Tuesday, August 23, 2011 5:29 PM
To: Velocity Aircraft Owners and Builders list
Subject: REFLECTOR: Franklin EGT

 

What EGT temps are others with Franklins seeing when running LOP?  I used to
see temps ranging from 450-550 C, but my sensors are strapped on the outside
of the exhaust and I'm probably getting readings lower than actual.  I
recently moved them the the cylinder exhaust tubes which is closer to the
cylinders.  I expected to see higher readings, however the #6 EGT is running
580-650 C.  Is that too high?

 

John

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