Today's Message Index:
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1. 06:14 AM - Re: Engine quits at full throttle (craig bastin)
2. 07:45 AM - Re: Re: Engine quits at full throttle (mau11)
3. 09:13 AM - Re: Engine quits at full throttle (rampil)
4. 09:48 AM - Re: Re: Engine quits at full throttle (Robert Borger)
5. 11:49 AM - Mechanical fuel pump - replacement of (Bob Fairall)
6. 12:35 PM - Re: Engine quits at full throttle (Bud Yerly)
Message 1
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Subject: | Engine quits at full throttle |
Not that I am a rotax expert, but from my car tuning and racing experience,
I would suggest
that either your pump/s are not able to keep up with demand from the carbs
(unlikely, given
you are running two), you have and open return line??? (you did put the
restrictor in the return line
AFTER the carbs), or your carbs are WAY WAY TOO lean and you simply don't
have enough fuel entering
the engine to keep it running at full throttle. This is the most likely
situation IMHO assuming you have
the restrictor installed. An excessively lean mix could also account for the
lack of MP at full throttle.
No fuel to burn means no expanding gasses so no pressure to drive the
impeller side of the turbo, so less
boost than expected so a lower MP than expected.
You can get some good automotive lean/rich gauges for around $100 these day,
if you lift the needles in your carbs
a bit and it runs better, I would suggest you invest in one to get your mix
right. Failing that, you mentioned contaminated
fuel filter, have you checked to see if the fuel is leaving the tank freely,
by dropping the fuel line off the carb
and see how much fuel comes out when the pumps are on.
hope this helps
craig
kit 577
vh-xsv
_
Message 2
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Subject: | Re: Engine quits at full throttle |
X-mailer: Foxmail 6, 10, 201, 20 [-fr-]
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Message 3
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Subject: | Re: Engine quits at full throttle |
Hey Bob,
Similar story on my flight tests. Check for soot on bottom of your
carbs. On mine, one of the exhaust pipes would come lose at full throttle only,
and just enough to boil the fuel in one float bowl!
Good Luck,
Ira
--------
Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=261595#261595
Message 4
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Subject: | Re: Engine quits at full throttle |
Ira,
Thanks. I'm going to run more checks tomorrow. I'll check for the
loose exhaust.
Best regards,
Bob Borger
Europa Kit #A221 N914XL, XS Mono, Intercooled 914, Airmaster C/S
http://www.europaowners.org/N914XL
Aircraft Flying!
3705 Lynchburg Dr.
Corinth, TX 76208
Home: 940-497-2123
Cel: 817-992-1117
On Sep 5, 2009, at 11:11, rampil wrote:
>
> Hey Bob,
>
> Similar story on my flight tests. Check for soot on bottom of your
> carbs. On mine, one of the exhaust pipes would come lose at full
> throttle only, and just enough to boil the fuel in one float bowl!
>
> Good Luck,
>
> Ira
>
> --------
> Ira N224XS
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Subject: | Mechanical fuel pump - replacement of |
Hi Europa folk,
My 'Classic' is fitted with a Pierburg mechanical fuel pump on its 80hp
Rotax 912. The part number appears to be 971 65 5-255.
The fuel pump is now some 12 years old and I want to change it, but have
found this Pierburg pump ceased to be manufactured about 4 years ago. There
is a substitute fuel pump made by AC, but this is slightly longer and fouls
the starboard side radiator.
I'm wondering whether anyone else has come across this problem before and
whether there is a solution anyone can offer me please (that isn't a
relocation of the radiators!).
Thanks
Bob Fairall
G-BXLK, kit 71, 400 hours flying and counting, and also kit no 494 slowly
making progress.
Message 6
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Subject: | Re: Engine quits at full throttle |
Bob,
Sorry to hear about your engine woes.
>From my experience in the shop here are some things I've run into:
Check that there is not 912S restrictor in your return line for the 914.
The restrictor is necessary in the 912S but Rotax forbids it in the
914. Make sure the return is not pinched either. See your install
manual on line with Rotax.
Don't make the mistake of swapping the fuel intake line and return
lines. (Believe it or not the engine runs, but goofs up the fuel
metering as one would expect, and won't accelerate properly or hit top
end.)
I hate to admit that I have seen one fuel pump hooked up backwards
electrically, and due to plumbing wouldn't feed enough fuel for full
power, but it would start...
Check your airbox and static pressure sensors aren't clogged or kinked,
or worse yet still plugged.
The new 914s have the removable fuel pans, and easy access to the float
bowls. Pull them and check for crap.
If dirty, get a rebuild kit and clean up the carbs.
Since you have 10 hours on your engine, it may be a mute point by now
but fuel quality is a combination of the source and materials quality in
the plane... Fuel lines are not shipped clean and there is residue in
them as well as the tank. Fuel with ethanol will clean better than Av
gas.
FBO's do filter their gas to a very high standard, but I find very fine
white organic material in it that my filters found, so think about pre
filtering your fuel. Since doing so I've had no problems.
My technique for assuring clean fuel tank and lines:
First. Get a pre filter funnel for your fuel. Fill the tank to the neck
with 20 gallons of premium unleaded with ethanol. Shake the aircraft
and check for leaks.
Next, disconnect the fuel delivery line at the engine fuel regulator and
pump the fuel back into the cans, alternating between main and reserve
sides. The filters will clean the tank. The pre tank filter funnel
will clean the fuel going back in. Fill again, and allow to sit. More
will settle, so repeat the fuel straining. Then I do it one more time
(total of three times) to insure tank and more importantly the lines are
clean. Fuel lines are notorious about being dirty. I don't use the
filtering gas for my first engine run, I Premium gas or Av gas.
While doing the above, do a flow and pressure check. I have a valve
hooked to the line off the aircraft fuel line with a T and fuel pressure
gauge to check for fuel delivery pressure and and volume. It is also a
good time to adjust the fuel flow measuring sensors. If you have in and
out metering, hook the delivery line to the return line and circulate
the fuel. Fuel flow should read zero. (912S owners can do this with
one fuel flow device and the restrictor installed and measure the flow
rate and pressure delivery with fuel returning to the tank.)
Bud Yerly
Custom Flight Creations
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