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                           JabiruEngine-List Digest Archive
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                     Total Messages Posted Wed 09/04/13: 1
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Today's Message Index:
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     1. 05:30 PM - EGT  (BobbyPaulk@comcast.net)
 
 
 
________________________________  Message 1  _____________________________________


Time: 05:30:19 PM PST US
From: BobbyPaulk@comcast.net
Subject: JabiruEngine-List: EGT


Guys 
I am in the middle of my " Conditional" Inspection. 
I put 37 hrs. on my 3300 since last year. I had 3/4" of clean honey colored oil
in my catch bottle and used less than a quart for the 37 hrs. 
I would like to cruise my Zodiac 601 at about 2700 RPM but the EGT gets over 1400
deg. on the back two cylinders and 1350 ~ 1375 on two others at that RPM range.
I have to pull back the throttle to 2450 ~ 2500 RPM to get under 1350 EGT
temps. If I raise the RPM to 2800 the EGT on #6 will decrease 50 to 60 degrees
but #5 will go up about the same amount. 
I am running a 260 main jet and a 285 needle jet. This is already much richer than
the standard setup. I am thinking of drilling the needle jet out .001 and
see if the EGT comes down a little. If so I might go another .001. 
I am turning a 51" Sensenich prop in lieu of the standard 49" so it should take
a little more fuel at a given RPM due to the MP being a little higher. 
My plugs are showing a lean burning engine - light grey. I am using 93 Oct. non
ethanol Marine gas and at 2400 ~ 2500 RPM burning less than 5 GPH. 
Has anyone out there had to go this rich to get the EGT down under 1375. I have
checked the float level and have a paper filter on the fuel line just before
the carb. The float bowl is clean every time I have checked it. 
Also I re-torqued my head bolts and over half took about 10 ~ 15 deg. before the
torque wrench clicked. The ones that moved were all in the lower 3 of each cylinder
. 
Has anyone else had a similar experience or know of a fix?? 

Thanks, 

Bobby ( age 75 ) 
Zodiac 601 XL "B" 
Jabiru 3300 S/N 1141 
Sensenich 64" x 51" Prop 
Bing Carb 260 Main & 285 Needle Jet 
Status - Flying 187 hrs. 

Do Not Archive 

 

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