I am sure the Rotax people would be able to check the timing in a couple of
minutes.
given I havent had a chance to get a really close look at a rotax engine I
couldnt comment on how they set the initial spark timing, If you had access
to
a pully or flywheel that runs at crankshaft speed it would be possible to
create your own timing marks, but it requires you to remove valve covers and
a spark plug so you
can determine when cylinder 1 is at TOP Dead Centre (ie when the fuel air
mix would be burning if the engine was running)mark the pully or flywheel
then coming back the correct number of degrees and creating a mark or
pointer on a fixed part of the engine next to the pully/flywheel. You can
then use an inductive pickup
timing light that will detect the spark pulse running to the plug and flash
a strobe beam in time with the spark. Point the light at your timing mark
with the engine running and you
can see the mark on the pully and the pointer should line up each flash of
the stobe.
As for the engine running fine, it may actually run slightly better that
normal at higher rpm as the advanced spark gives the fuel air mix longer to
burn, too much advance
is a bad thing though as it is much the same as your engine pre-igniting
which can happen with lower rated fuels which can do damage to your engine.
good luck
craig
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com]On Behalf Of Karl Heindl
Sent: Sunday, 27 July 2008 9:46 AM
To: europa-list@matronics.com
Subject: RE: Europa-List: Coolant overheating
Hi Craig,
I am quite sure about the temperature. When it reaches about 120, it boils
over into the overflow bottle,
which is what I would expect. And in the cruise it is normal.
The ignition timing is something new and I wouldn't know how to check
that. The engine is running just fine.
I will fly over to the Rotax agent this coming week and see if he has any
ideas.
Cheers,
Karl
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From: craigb@onthenet.com.au
To: europa-list@matronics.com
Subject: RE: Europa-List: Coolant overheating
Date: Sun, 27 Jul 2008 08:47:25 +1000
Karl, just a thought here, but do you KNOW your temp sender is correct, IE
stuck it in a pot of just boiled water which you can know the
temp of between one or two degrees of error and subjected it to vibration
etc by shaking it etc. When I was racing we had problems from time to time
with faulty sender units that would
vary by as much as 20 deg C. and this variation would change across
minutes or even instantly in some cases. It was a major pain to
work with, when you expect an engine to be running close to max temps, and
then it spikes 20 degrees over max. Might i suggest
you try a fluid filled type sealed unit to run as a comparison so you can
see if there is a difference.
The other thing i would be looking at if you believe the temps are
accurate, is your spark timing, excessively advanced timing will cause high
temps at low RPM. ie warm up
and taxi. but will not be as noticable at higher RPM. I have seen 20 - 30
degree C increase in temps from around 5 degrees of advance from say 10 to
15 degrees BTDC. high
levels of spark timing advance are generally helpfull at higher RPM but
not much benefit at low RPM. Some of the modern bike engines vary spark
timing by as much
as 20 degrees depending on conditions.
hope this helps
craig
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com]On Behalf Of Karl Heindl
Sent: Sunday, 27 July 2008 7:55 AM
To: europa-list@matronics.com
Subject: RE: Europa-List: Coolant overheating
Bob,
I certainly have, plus all the other gaps near the air intake. I sealed
off the gills and opened up the area at the
bottom aft of the radiators for main exit.
Karl
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From: ptag.dev@tiscali.co.uk
To: europa-list@matronics.com
Subject: RE: Europa-List: Coolant overheating
Date: Sat, 26 Jul 2008 22:13:02 +0100
Hi! Karl
Have you blocked the gap between cowl and underside of oil cooler?
Bob H
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Karl Heindl
Sent: 26 July 2008 13:30
To: europa-list@matronics.com
Subject: Europa-List: Coolant overheating
I have been unable to solve my overheating problem:
I had replaced all glycol coolant and all hoses. Ever since then the
coolant temperatures on the ground and in the climb are way ahead of the oil
temperature.
After warming up the engine the coolant is typically 25 C (45 F) hotter
than the oil. The oil and cylinder head temperatures are always normal. Only
in the cruise am I getting normal readings. The coolant temp. probe is in
the coolant and is accurate.
I have run out of ideas. Has anyone got any clue about this mystery ?
Cheers,
Karl
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