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1. 05:30 PM - EGT (BobbyPaulk@comcast.net)
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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.
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