Today's Message Index:
----------------------
1. 02:54 AM - Re: Oil in exhaust, Rotax 914 (Frans Veldman)
2. 10:25 AM - fluting ands reading glasses (Fergus Kyle)
3. 01:47 PM - Re: Oil in exhaust, Rotax 914 (jason Parker)
4. 02:26 PM - Re: Oil in exhaust, Rotax 914 (Frans Veldman)
Message 1
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| Subject: | Re: Oil in exhaust, Rotax 914 |
jason Parker wrote:
> If the ball in your check valve doesn't make a good seal, it will
> fill up the turbo oil drain box due to gravity feed. When you go to
> start it, you will bleed oil past the turbo seal until the oil coming
I have reasons to believe that the oil was already past the seal before
I started the engine. In the months that the engine didn't run, oil has
seeped past the seal. Before the engine produced any significant heat,
the oil was already blown out the exhaust. While I agree that a constant
flow of oil in a very heat environment will coke up the wastegate, I
don't think that oil that is quickly thrown out of a cold engine once in
a few months will cause wastegate problems. In fact, the wastegate on my
914 feels still normal.
> If your burning
> oil all the time then it is one of the following, your turbo needs to
> be rebuilt, your oil check valve is not poping at 65 psi and over
> supplying the turbo, or your secondary scavange pump isn't working
> properly.
I agree with that. I will thus carefully check that the engine is not
burning oil all the time. At the moment I can't start the engine because
I drained the tank (the prime reason I started the engine was that this
was the easiest way to get rid of the small amount of fuel that was left
;-) ). Next time (won't take months!) I will carefully monitor whether
oil is thrown out again.
Thanks for your comments,
Frans
Message 2
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| Subject: | fluting ands reading glasses |
"BTW I have been told that some airline pilots are using multifocals
with two reading portions: the low one as usual and another one at the top
of the lense for seeing the overhead panel! "
Remi:
When needing to overcome the ravages of time, I opted for
Quadrifocal glasses - Bifocal as normal, with the distance range about 70 %
down from the top and the bottom focused on 36 inches (instruments) - and a
small sector at the top for the 12" overhead panel, and another small sector
on bottom for lap reading charts etc. They looked weird but did the job.
All of this was for the amazing Lockheed L-1011 TriStar.
"The distance portion of the lens is therefore reduced, but do they often
need to see outside?"
Are you serious?
At 480 knots, you have to watch out even in cloud - perhaps
even more intently than at 80 knots? In most airliners ('cept the 747) the
pilots usually die before their clients, unlike lawyers and doctors..
Ferg
#A064 Mono 914 CSprop
Message 3
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| Subject: | Re: Oil in exhaust, Rotax 914 |
I had a guy with a 30 hour engine blow his engine with the same reasoning.
Yes, once you will up the oil drain box, it will seep past the seals. Turbo
s can't take any back pressure at all or they will leak. You can do the sam
e thing with a new turbo. It is your check valve. replace the ball and the
banjo bolt and you will be good.
Jason
--- On Sun, 10/25/09, Frans Veldman <frans@paardnatuurlijk.nl> wrote:
From: Frans Veldman <frans@paardnatuurlijk.nl>
Subject: Re: Europa-List: Oil in exhaust, Rotax 914
jason Parker wrote:
> If the ball in your check valve doesn't make a good seal, it will
> fill up the turbo oil drain box due to gravity feed. When you go to
> start it, you will bleed oil past the turbo seal until the oil coming
I have reasons to believe that the oil was already past the seal before
I started the engine. In the months that the engine didn't run, oil has
seeped past the seal. Before the engine produced any significant heat,
the oil was already blown out the exhaust. While I agree that a constant
flow of oil in a very heat environment will coke up the wastegate, I
don't think that oil that is quickly thrown out of a cold engine once in
a few months will cause wastegate problems. In fact, the wastegate on my
914 feels still normal.
> If your burning
> oil all the time then it is one of the following, your turbo needs to
> be rebuilt, your oil check valve is not poping at 65 psi and over
> supplying the turbo, or your secondary scavange pump isn't working
> properly.
I agree with that. I will thus carefully check that the engine is not
burning oil all the time. At the moment I can't start the engine because
I drained the tank (the prime reason I started the engine was that this
was the easiest way to get rid of the small amount of fuel that was left
;-) ). Next time (won't take months!) I will carefully monitor whether
oil is thrown out again.
Thanks for your comments,
Frans
le, List Admin.
=0A=0A=0A
Message 4
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| Subject: | Re: Oil in exhaust, Rotax 914 |
jason Parker wrote:
> I had a guy with a 30 hour engine blow his engine with the same
> reasoning. Yes, once you will up the oil drain box, it will seep past
> the seals. Turbos can't take any back pressure at all or they will
> leak. You can do the same thing with a new turbo. It is your check
> valve. replace the ball and the banjo bolt and you will be good.
Ok, I will replace these, shouldn't cost me a fortune. Thanks!
Frans
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