Hello Hartmut
Seams you are write.
I’m now almost convinced that my mixture is not lean, I’ll do the tests you
propose next weekend and I’ll keep you posted for the results.
As far as the alignment concerns I did not see any suspicious bent on engine
mount pipes or crack on any welding, seams very clean and I’m planning to
perform another
measurement next weekend in order to verify the tilt.
Please let me know an accurate method to identify Ercoupe’s center line and
then using a laser I will check again the thrust line tilt.
In my manual thrust line is tilted downwards 3 ½’’ and to the right 5’’ is that
correct please re-check and advice.
Thanks again for your time spent for me.
Best regards
Kostas
--- Στις Κυρ., 02/11/08, ο/η Hartmut Beil <[EMAIL PROTECTED]> έγραψε:
Από: Hartmut Beil <[EMAIL PROTECTED]>
Θέμα: RE: [ercoupe-tech] Ercoupe flying in Greece
Προς: [EMAIL PROTECTED]
Ημερομηνία: Κυριακή, 2 Νοέμβριος 2008, 13:00
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Kostas
First. I doubt you are having a lean engine problem.
I am positive that this is an installation problem.
I just went through the whole thing myself and found several things wrong that
should have been caught by the mechanics.
If your engine is running lean, you would have a lot of power. and you would
see a significant drop in rpm when applying carb heat.
If you don't get a drop in rpm when applying carb heat, there is something
wrong. Test it with the filter taken out next time. Then and only then you can
see what the flapper is really doing.
If you get to your airplane next time, take your camera and take pictures of
the carburetor heat box and the carburetor itself. Both sides.
Did you verify that the carburetor lever is fully opened when full throttle? It
is easy to attach the cable wrong.
As for your engine mount, I need to see that too. The ERCOUPE engine is tilted
downwards AND to the right by installation.
This is 3 1/2 to the right and 5 degrees downwards! I am not sure how you
measured the tilt , but it may have been the designed tilt!
There are basically few people in Europe that work on historic airplanes and no
one that I know of is specialized in Ercoupes. Checking the alignment is
something you better do yourself.
Here is how.
1. Closely investigate the engine mount. It is made from steel tubing and all
tubes should be straight , all welds too and all attachment points should look
straight.
2. Look at the front strut attachments. Can you make out any bends or areas in
doubt? Take pictures.
3. If still in doubt, use a laser and make correct measurements.
A new engine mount is just doubled in price by Univair to 2000 Dollars.
So a replacement by feel will cost you a fortune.
If yours looks straight, it is most likely straight. It takes a lot to bend
these things. A miss- alignment is rather elsewhere.
Trust me, your engine is developing not enough power and the reason is most
likely the installation of the engine. Take images on how the engine si
attached to the engine mount. I'd like to see that too.
Keep me posted.
Hartmut
Date: Sun, 2 Nov 2008 08:50:42 +0000
From: [EMAIL PROTECTED]
Subject: RE: [ercoupe-tech] Ercoupe flying in Greece
To: [EMAIL PROTECTED]
Good day Hartmut
Thanks for your good advices.
Please note following:
The engine was just overhauled to makers' standard and not replaced.
Tested by ''LOMA'' to 2575 rpm successfully those rpm I never saw on my tach
since engine's installation.
I checked carb heater, the flapper is moving freely and isolating firmly fresh
air intake with hot air duct.
I never run the engine without air filter just I change the new filter I bought
from Univair with the old thinner one without any improvement.
I will check it without filter next weekend and I keep you posted for results.
Engine tested with switched off L or R magneto and rpm drops about 75 .
I checked for loose hoses and connectors on the path from carb to cylinders,
nothing found. The only suspicious indication is that the whole intake manifold
is very hot during engine's running which sounds like lean mixture to me..
The other and I think more serious problem is the aircrafts' alignment. Do you
believe that if I change the engine mount I'll solve permanently the trouble.
There is any way in Europe to check Ercoupe's alignment?
Any assistance and visit is welcome. I am based north of Athens on a private
airstrip about 1 and half hour way far from city of Athens.
Kind regards
Kostas
--- Στις Κυρ., 02/11/08, ο/η Hartmut Beil <[EMAIL PROTECTED]> έγραψε:
Από: Hartmut Beil <[EMAIL PROTECTED]>
Θέμα: RE: [ercoupe-tech] Ercoupe flying in Greece
Προς: [EMAIL PROTECTED], "Techlist Ercoupe" <[email protected]>
Ημερομηνία: Κυριακή, 2 Νοέμβριος 2008, 0:30
Kostas.
There are many possibilities that cause low power output in our engines.
Sacramento Skyranch lists over 50 of them, half of them not applicable to our
engines.
Follow the link here: http://www.sacskyra nch.com/eng27. htm
I understand your engine had been recently rebuilt and since installation is
not producing the power you are used to.
Also the carb heat seems not to show an effect.
I would check there first. The carburetor heat should always be working. Ther
will be one day that you need it.
It creates a drop of around 100 rpm.
I am thinking your carburetor heat might be hooked up wrong. I saw that happen
when the mechanic did not understand the system and hooked up the wire the
wrong way. Then you would open the carb heat by pushing in and close by pushing
out. That seemed not right to the mechanic and he solved the problem by
loosening the attachment arm on the flapper valve, thus eliminating the carb
heat. Luckily it got stuck in an open position. Yours might be stuck in a
closed one. That would explain the loss in rpm and the inability to get a rpm
drop on carb heat.
I think the light grey exhaust color is due to the fact that you are burning
100LL . Mogas makes it always dark to sooty black, 100LL settles in grey. My
feeling is that these colors are independent from engine richness.
Before you are working your way through the Skyranch trouble shooting list,
have a look at your carb heater. The best to check for the proper function is
to remove the air filter and have some actuate the carb heat . You should be
able to see the flapper go fully up and down. If this works properly, you
should see a drop in rpm on application.
Second leave the air filter out and try a runup now. If you gain rpm, your air
filter might be bad.
Then check the timing. How is the engine running on one magneto alone?
Check for loose hoses and elbow connectors on the path from the carburetor to
the cylinders.
What kind of overhaul was it. Did you get a replacement engine or was yours
rebuild?
And last: Where are you based in Greece? Can one come and visit you?
Hartmut
To:
From: constantinos16@ yahoo.gr
Date: Sat, 1 Nov 2008 16:49:15 +0000
Subject: [ercoupe-tech] Ercoupe flying in Greece
Good day all
Although I'm long time member in this forum it's my first time posting and I
need help from any one has an idea about my problem.
I own a 415 C s/n 1477 was registered in USA as N94154 now SX-NAI recently
renovated with a newly rebuild engine C85-12F along with McCauley cm7148 prop
and now flying in Greece.
1. From the first flight the engine could not reach max rpm 2575 in flight and
I felt the power was weak during any part of flight.
Static rpm 2150 and max during straight and level 2350, in short runways with
two person on board is hard to take off.
The carb heat when applied does not change/drop the rpm and engine's exhaust
color is not black just light grey, does this mean lean mixture. My mixture is
secured to rich.
My carburetor (overhauled as well) is a Stromberg NA-S3A1 and I have checked
also a Marvel MA-3SPA 10-3565-1 without improvement.
2. When flying straight-level was difficult to trim and fly hands off and I
felt the drag, the max speed i saw was 90mph.
After thorough investigation found that the engine thrust line is deviated from
the center line not 3,5 degrees as per maker but 12!!!! downwards.
We fitted washers at the lower two points of engine mount and brought back to
3,5 degrees the engine trust line compared to center line. Then flying was
quite improved but not satisfactorily enough(speed remain same).
Does this mean a bended engine mount or something more serious?
Any idea is more than welcome.
Thanks in advance for your time to read my post and sorry for my bad English.
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