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Allegro 2000, 912UL Initial Engine Test Run

 
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Gilles.Thesee(at)ac-greno
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PostPosted: Mon Sep 04, 2006 1:31 pm    Post subject: Allegro 2000, 912UL Initial Engine Test Run Reply with quote

Hi Thom,

Quote:
I think we are in general agreement and the discussion has been of value to anyone who cares, or at least I hope so.


Agreed.
Rotax engines are very tough. I don't think Hugh's engine was damaged,
though I tend to treat my own engine more kindly Wink
Nice discussion.

Best regards,
Gilles
http://contrails.free.fr


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hgmckay



Joined: 23 May 2006
Posts: 397

PostPosted: Mon Sep 04, 2006 2:18 pm    Post subject: Allegro 2000, 912UL Initial Engine Test Run Reply with quote

Thom/Gilles:

I have followed your dialogue with great interest, and it has helped me
immensely. I have no experience with this engine, so I was alarmed when I
saw the CHT continuing to rise. I was even more alarmed when I shut down,
and heard the coolant boiling in the overflow bottle. I still don't know why
this happened. There is no question that the engine was not being cooled
properly, the question is why? It may have been a combination of existing
circumstances (i.e. static engine run, no horizontal movement of plane,
tarmac temp 88 degrees+, engine fully cowled with spinner, horizontal
radiator, and length of operation). I do know that with the spinner on, the
91/2 inch diameter spinner flange eats up most of the free area for air to
enter the engine compartment. In fact there is only 18 square inches of free
opening left for air to enter the engine compartment. This may be fine with
the plane traveling at, say 90 mph, but maybe not with the plane sitting on
the ground for 10 to 15 minutes in 88° F. I don't know, but certainly I
would think the plane designers would design for this condition. What free
opening does Rotax require on fully cowled engines?

Since this was the initial engine start, I am going to call Lockwood Green
tomorrow and explain every thing that happened to them and get their
opinion. I'll keep both of you informed as to what they say. Again, thank
you for your advice, counsel, experience, and knowledge.

Hugh
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hgmckay



Joined: 23 May 2006
Posts: 397

PostPosted: Wed Sep 06, 2006 4:45 am    Post subject: Allegro 2000, 912UL Initial Engine Test Run Reply with quote

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daveaustin2(at)can.rogers
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PostPosted: Wed Sep 06, 2006 7:20 am    Post subject: Allegro 2000, 912UL Initial Engine Test Run Reply with quote

Re oil venting..
Has anyone seen any advice on what action to take when just changing the oil
filter? It would certainly be introducing some air into the system as it
isn't possible to fill the filter with oil since it lies sideways.
SI-04-1997 dated Sept. 2002 does not address this.
Dave Austin 601HDS - 912, Spitfire Mk VIII


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hgmckay



Joined: 23 May 2006
Posts: 397

PostPosted: Wed Sep 06, 2006 7:54 am    Post subject: Allegro 2000, 912UL Initial Engine Test Run Reply with quote

Dave: The Rotax Service Instruction (SI-04-1997 R3) Section 1.5 states that
this procedure shall be performed after lubrication system is opened or
drained during maintenance work. It doesn't specifically state that after
changing the oil it has to be done, but as you say the system has been
"opened", so I would think it would apply. The guys at Lockwood can tell you
for sure.

Hugh McKay

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