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1. 01:05 AM - Re: Timing (James Clive)
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Always a process of elimination, well done for getting there. Always
difficult to know where to start!
Induction can always be quickly checked by hand propping with carby off
and your hand blocking the air. You would hear the missing gasket in
this case as the air is sucked in any leak.
So after a rebuild one to try before you put the carby on, or one to try
if you suspect an induction leak.
Regards, Clive
> On 24 Mar 2015, at 22:30, BobbyPaulk@comcast.net wrote:
>
> 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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