For the record an interesting thing happened to me with my zenith which has
an aftermarket turbo fitted.
Above 11k full power caused vibration - I thought this was just a normal
"fault" of the aftermarket turbo. Take off from 8500 etc all normal.
However the problem got worse and manifested itself at lower altitudes.
We put on a vernier to manually adjust waste-gate and the problem showed up
at higher MP - over 34". Otherwise the engine ran normally. It felt like
fuel starvation.
New carb vacuum chamber diaphragms, carb balance, full fuel system check,
fuel pressure - no change. All readings completely normal except for the
vibration and minor power loss at higher altitudes and power settings.
Just out of interest we changed the carb float bowl gaskets which had been
changed recently using rotax original parts. We put in after market softer
cork gaskets because that's what we had. This cured the problem completely.
The conclusion was that the float bowls had been dropped or the mating faces
had been damaged in some very minor way allowing air to get into the system
but only at higher differential pressure - higher power settings and higher
altitude. There was no evidence of fuel leak. The softer aftermarket
gasket compensated for the minor flaws in the mating surfaces of the float
bowls.
We spent two days and maybe USD500 solving a problem which was turned out to
be a 5c gasket.
Will
Bogota
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of europapa
Sent: 21 May, 2012 15:51
Subject: Europa-List: Re: Lack of power with water heated carb body
mountings
Hi,
in the mailing list I can see all of your replies but not here in the forum
[Question] .
I am very happy to see so many help by real experts.
Thank you so much.
Karl, Craig, Bob, Pete,Terry, John and all the others, thank you so much.
I am now thinking too that the added heat is not an issue.
Today I had my prof-check or how do you call it?
At full throttle and even with my not so light flight inspector the power
produced by my 912s at high rpm / full throttle was good.
But when reducing the rpm / throttle the engine became rough like an old
diesel engine.
I am rather confused.
Now I have removed the carbs and will overhaul them.
If that will not bee the answer I will totally remove the carb heaters to
see if that will solve the problem.
If there will still no cure ......... dose anybody wants to buy a very nice
Europa Trigear...... ( no way! ;-) ).
More information later, I am really tiered after this long and exciting day.
CU
Juergen
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