Today's Message Index:
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1. 03:31 PM - Timing (BobbyPaulk@comcast.net)
2. 07:53 PM - Re: Timing (Victor Kidd)
Message 1
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List
Here is the latest in the timing drama on my 3300.
I installed new plugs and cranked the engine again. This time I was able to get
it to run with the choke off.
I noticed that the EGT for #3, 4, & 5 was 800 to 900 degrees while #1, 2, & 6 were
cold. After about a minute I got the RPM up to about 1100.
#6 came on line but #1 & 2 were still cold. With #6 on line I was able to coax
the RPM up to about 1200 when #2 came in.
I determined then that I did not have a timing problem. When the throttle was brought
back to 1100 #2 would quit cold again.
We grabbed a boroscope and started looking at the intake pipes and manifold. We
found that the intake gasket on #1 had rotated on the outboard bolt about 30
degrees before it was tightened. That left a gap on both sides between the bolts
of about 3/4" with part of the gasket in the pipe. That really messed up the
manifold pressure and mixture.
After correcting this self induced problem the engine settled down to 750 RPM and
was smooth as ever.
The Rotec E-Mag really makes a difference. It starts on the first blade when warm
and not more than 2 or 3 when cold.
BTW - I modified my alternator to the Upgrade approved by Jabiru ( AVDALSR087-2
) and I am getting 14.6 volts at 1300 RPM. Amp meter is always hunting but it
got up to 4 amps so I think it will work better than original. I did not have
to modify the Dynon tach display.
Bobby ( age 76 )
Zodiac 601 XL "B"
Jabiru 3300 S/N 1141
Sensenich 64" x 51" Prop
Bing Carb 260 Main & 290 Needle Jet
Status - Flying 236 hrs.
Message 2
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Congrats Bobby, I knew you could do it.
Victor-
----Original Message-----
From: BobbyPaulk@comcast.net
Sent: Mar 24, 2015 6:30 PM
Subject: JabiruEngine-List: Timing
List
Here is the latest in the timing drama on my 3300.
I installed new plugs and cranked the engine again. This time I was able to get
it to run with the choke off.
I noticed that the EGT for #3, 4, & 5 was 800 to 900 degrees while #1, 2, & 6 were
cold. After about a minute I got the RPM up to about 1100.
#6 came on line but #1 & 2 were still cold. With #6 on line I was able to coax
the RPM up to about 1200 when #2 came in.
I determined then that I did not have a timing problem. When the throttle was brought
back to 1100 #2 would quit cold again.
We grabbed a boroscope and started looking at the intake pipes and manifold. We
found that the intake gasket on #1 had rotated on the outboard bolt about 30
degrees before it was tightened. That left a gap on both sides between the bolts
of about 3/4" with part of the gasket in the pipe. That really messed up the
manifold pressure and mixture.
After correcting this self induced problem the engine settled down to 750 RPM and
was smooth as ever.
The Rotec E-Mag really makes a difference. It starts on the first blade when warm
and not more than 2 or 3 when cold. BTW - I modified my alternator to the Upgrade
approved by Jabiru ( AVDALSR087-2 ) and I am getting 14.6 volts at 1300
RPM. Amp meter is always hunting but it got up to 4 amps so I think it will work
better than original. I did not have to modify the Dynon tach display.
Bobby ( age 76 )
Zodiac 601 XL "B"
Jabiru 3300 S/N 1141
Sensenich 64" x 51" Prop
Bing Carb 260 Main & 290 Needle Jet
Status - Flying 236 hrs.
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