Today's Message Index:
----------------------
1. 05:16 AM - Re:912 Cooling Problem (ruruny@aol.com)
2. 05:38 AM - bent nose wheel axle (ruruny@aol.com)
3. 07:04 AM - High EGTs (Larry McFarland)
4. 03:37 PM - Re: 912 Cooling Problem (tlongo)
Message 1
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| Subject: | Re:912 Cooling Problem |
Jim,
If your EGTs are high, your probably running lean at the higher RPMs.
Possible leak or cracks in carb flanges. Due to lower Fall OAT, repositioni
ng of the needles in the carbs
might help. I have CHT and Coolant temp monitored on my 912 UL and they are
almost the same temps.
I would not suspect coolant to be an issue, since the CHT is within spec, b
ut the sudden increase of coolant in the
bottle is a concern. Have you opened up or serviced the coolant system befo
re this happened
or do you have a thermostat installed. Check the seal in the coolant cap. I
f that hose is collapsing or is obstructed and keeping
fluid in the bottle, the fluid in the reservoir would be low when the engin
e cools.
Brian
www.701builder.com
50 hrs
Message 2
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| Subject: | bent nose wheel axle |
Just a heads up that on my 1st annual I found the nose wheel axle bent afte
r 50 hrs.
It was not readily noticeable as the way it bent, the wheel was still cent
ered in the fork.
I knew I had few unusual landings on the grass runway where the nose gear w
as side loaded
while still having rudder input when the nose touched.
I found in the archives from last year about the new 750 solid axle and tha
t it would fit the 701.
I had the original hollow one.
The axle part number for the 701 is now that new solid axle also. Order it
without the spacers
and its around $47. (Thanks Caleb and Joice at Zenith)
The old axle was stuck and had to be hammered out. I figured I replace the
bearings and got
them from Matco for $14.80 each.
Brian
Message 3
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Hi Jim,
The EGTs are balanced mostly by rich and lean mixtures. If your EGTS are
high, I'd consider enriching the
mixture by going to the next size main jet. Or, if you are using Bing
Carbs, bring the Jet needle up one space
via the circlip holding it. This is equal to 3 jet sizes if enrichment. I
fly a Subaru, but the EGT issues are much
the same for all engine carb combinations.
Larry McFarland 601HDS at www.macsmachine.com
Message 4
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| Subject: | Re: 912 Cooling Problem |
If your EGT's are high on both sides I doubt if you have an air leak on both sides.
If EGT's were ok last flight and just changed I would suspect cooler air
and/or fuel. If the ethanol content is very high your mixture will go leaner.
Wide open throttle is your main jet and from 1/4 to 3/4 throttle open is your
needles and idle to 1/4 throttle is low speed jet circuit. My EGT's run a little
higher when I pull back from wide open and lower at wide open. The higher
the octane the leaner the mixture will get. My EGT's with pump 93 run 1400 to
1450 and in the winter will run about 50 deg hotter than summer. Always go back
to when things were ok and try to think if anything has been changed, there
is usually a reason that caused it. Also if you checked your coolent overflow
when the motor was hot the level will be high until motor cools and coolant
gets sucked back in. Good luck!
Tom
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