Today's Message Index:
----------------------
1. 03:28 AM - 582 cold seizure (Dave G.)
2. 04:04 AM - fuel return system rotax 912s (fxcon)
3. 04:43 AM - Re: fuel return system rotax 912s (MR PAUL MITCHELL)
4. 11:33 AM - Re: fuel return system rotax 912s (Thilo Kind)
Message 1
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| Subject: | 582 cold seizure |
----- Original Message -----
From: "Ray" <raybcorbett@yahoo.co.nz>
Newsgroups: rec.aviation.ultralight
Sent: Thursday, August 10, 2006 4:18 AM
Subject: Rotax 582 cold seizure
> maybe someone can help me out with this one a friend of mine was going
> to a farm strip early ish one morning tempreture was cool about 8 deg
c
> he did a good warm up taxied out ,took of and promptly seized at the
> top of the climb out no big problem at a 1000 ft above the airfield
> ,anyway I stripped the top end of the motor and sure enough one
piston
> had seized giving the classic four corner marks of a cold seizure and
> we put it down to not warming up enough, the engine had done just over
> 200 hrs and was well maintained and the other piston was not marked
at
> all
> So the motor was rebuilt with new parts I ground run it for approx 20
> mins at vairying loads but not full power and handed it over to my
> friend who started the rotax run in procedure with the trike tied to
> the hanger at 59 mins at the full power run it seized again, on
> stripping it was exactly the same as before with the four corner marks
> of a cold seizure ,he assures me he had the right fuel mix 50 to one
> the jetting is correct piston bore clearances are correct and again
the
> other piston looks perfect
> the engine is in an Airborne outback trike it is a blue head motor
and
> it has a new thermostat
> he tells me all temps were correct
> I know the rotax run in may be a bit aggressive maybe he should have
> gone a little easyer
> any help would be most appriciated
> thanks
> Ray
>
Message 2
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| Subject: | fuel return system rotax 912s |
Some advice please re rotax fuel return system.
Is this always necessary?
Do some installations run succesfully without it,say, with adequate fuel
line insulation & perhaps with dedicated air vent.to the fuel system
What is its main purpose-to cool the fuel by recirculating warm fuel
back into the tank,or perhaps to allow any fuel vapour to be purged from
the system?
All advice welcome.
Frank Connell Australia.
----- Original Message -----
From: Dave G.
To: rotaxengines-list@matronics.com
Sent: Thursday, August 10, 2006 8:27 PM
Subject: RotaxEngines-List: 582 cold seizure
----- Original Message -----
From: "Ray" <raybcorbett@yahoo.co.nz>
Newsgroups: rec.aviation.ultralight
Sent: Thursday, August 10, 2006 4:18 AM
Subject: Rotax 582 cold seizure
> maybe someone can help me out with this one a friend of mine was
going
> to a farm strip early ish one morning tempreture was cool about 8
deg c
> he did a good warm up taxied out ,took of and promptly seized at the
> top of the climb out no big problem at a 1000 ft above the airfield
> ,anyway I stripped the top end of the motor and sure enough one
piston
> had seized giving the classic four corner marks of a cold seizure
and
> we put it down to not warming up enough, the engine had done just
over
> 200 hrs and was well maintained and the other piston was not marked
at
> all
> So the motor was rebuilt with new parts I ground run it for approx
20
> mins at vairying loads but not full power and handed it over to my
> friend who started the rotax run in procedure with the trike tied to
> the hanger at 59 mins at the full power run it seized again, on
> stripping it was exactly the same as before with the four corner
marks
> of a cold seizure ,he assures me he had the right fuel mix 50 to one
> the jetting is correct piston bore clearances are correct and again
the
> other piston looks perfect
> the engine is in an Airborne outback trike it is a blue head motor
and
> it has a new thermostat
> he tells me all temps were correct
> I know the rotax run in may be a bit aggressive maybe he should have
> gone a little easyer
> any help would be most appriciated
> thanks
> Ray
>
Message 3
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| Subject: | Re: fuel return system rotax 912s |
Frank,
I live in the Uk and we do have some warm days. I would say the return
line is a must. It's purpose is to return any vapour lock or air bubbles
back to the tank. I can see mine while I am flying and there are bubbles
going back to the tank in a steady stream. Not a lot but they are there.
Paul Mitchell
----- Original Message -----
From: fxcon
To: rotaxengines-list@matronics.com
Sent: Thursday, August 10, 2006 12:03 PM
Subject: RotaxEngines-List: fuel return system rotax 912s
Some advice please re rotax fuel return system.
Is this always necessary?
Do some installations run succesfully without it,say, with adequate
fuel line insulation & perhaps with dedicated air vent.to the fuel
system
What is its main purpose-to cool the fuel by recirculating warm fuel
back into the tank,or perhaps to allow any fuel vapour to be purged from
the system?
All advice welcome.
Frank Connell Australia.
----- Original Message -----
From: Dave G.
To: rotaxengines-list@matronics.com
Sent: Thursday, August 10, 2006 8:27 PM
Subject: RotaxEngines-List: 582 cold seizure
----- Original Message -----
From: "Ray" <raybcorbett@yahoo.co.nz>
Newsgroups: rec.aviation.ultralight
Sent: Thursday, August 10, 2006 4:18 AM
Subject: Rotax 582 cold seizure
> maybe someone can help me out with this one a friend of mine was
going
> to a farm strip early ish one morning tempreture was cool about 8
deg c
> he did a good warm up taxied out ,took of and promptly seized at
the
> top of the climb out no big problem at a 1000 ft above the
airfield
> ,anyway I stripped the top end of the motor and sure enough one
piston
> had seized giving the classic four corner marks of a cold seizure
and
> we put it down to not warming up enough, the engine had done just
over
> 200 hrs and was well maintained and the other piston was not
marked at
> all
> So the motor was rebuilt with new parts I ground run it for approx
20
> mins at vairying loads but not full power and handed it over to my
> friend who started the rotax run in procedure with the trike tied
to
> the hanger at 59 mins at the full power run it seized again, on
> stripping it was exactly the same as before with the four corner
marks
> of a cold seizure ,he assures me he had the right fuel mix 50 to
one
> the jetting is correct piston bore clearances are correct and
again the
> other piston looks perfect
> the engine is in an Airborne outback trike it is a blue head
motor and
> it has a new thermostat
> he tells me all temps were correct
> I know the rotax run in may be a bit aggressive maybe he should
have
> gone a little easyer
> any help would be most appriciated
> thanks
> Ray
>
-------------------------------------------------------------------------
-----
No virus found in this incoming message.
09-Aug-06
Message 4
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| Subject: | Re: fuel return system rotax 912s |
Hi Frank,
most Rotax 912, that I know of, don't have the fuel return (including
mine, a Zodiac CH 601 HDS). No problems with that set-up, except during
re-starts on hot days. In such cases, the hot engine and the lack of air
going through the cowling will create vapor lock, which will make it
difficult to re-start. One way is to take the cowling off, so that the
hot air can get out. Another way, we just learned from a Rotx shop is to
switch on the electrical fuel pump, keep it running for 3 minutes,
switch it off, push a throttle ever so slightly forward and start
(without choke). Works well on the D40 in our flying club here. I
haven't tried that yet on my Zodiac.
Best regards
Thilo Kind
----- Original Message -----
From: fxcon
To: rotaxengines-list@matronics.com
Sent: Thursday, August 10, 2006 1:03 PM
Subject: RotaxEngines-List: fuel return system rotax 912s
Some advice please re rotax fuel return system.
Is this always necessary?
Do some installations run succesfully without it,say, with adequate
fuel line insulation & perhaps with dedicated air vent.to the fuel
system
What is its main purpose-to cool the fuel by recirculating warm fuel
back into the tank,or perhaps to allow any fuel vapour to be purged from
the system?
All advice welcome.
Frank Connell Australia.
----- Original Message -----
From: Dave G.
To: rotaxengines-list@matronics.com
Sent: Thursday, August 10, 2006 8:27 PM
Subject: RotaxEngines-List: 582 cold seizure
----- Original Message -----
From: "Ray" <raybcorbett@yahoo.co.nz>
Newsgroups: rec.aviation.ultralight
Sent: Thursday, August 10, 2006 4:18 AM
Subject: Rotax 582 cold seizure
> maybe someone can help me out with this one a friend of mine was
going
> to a farm strip early ish one morning tempreture was cool about 8
deg c
> he did a good warm up taxied out ,took of and promptly seized at
the
> top of the climb out no big problem at a 1000 ft above the
airfield
> ,anyway I stripped the top end of the motor and sure enough one
piston
> had seized giving the classic four corner marks of a cold seizure
and
> we put it down to not warming up enough, the engine had done just
over
> 200 hrs and was well maintained and the other piston was not
marked at
> all
> So the motor was rebuilt with new parts I ground run it for approx
20
> mins at vairying loads but not full power and handed it over to my
> friend who started the rotax run in procedure with the trike tied
to
> the hanger at 59 mins at the full power run it seized again, on
> stripping it was exactly the same as before with the four corner
marks
> of a cold seizure ,he assures me he had the right fuel mix 50 to
one
> the jetting is correct piston bore clearances are correct and
again the
> other piston looks perfect
> the engine is in an Airborne outback trike it is a blue head
motor and
> it has a new thermostat
> he tells me all temps were correct
> I know the rotax run in may be a bit aggressive maybe he should
have
> gone a little easyer
> any help would be most appriciated
> thanks
> Ray
>
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