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AW: RPM drop with a 914 above 100%

 
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uvtreith(at)t-online.de
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PostPosted: Sun Jun 10, 2012 3:15 pm    Post subject: AW: RPM drop with a 914 above 100% Reply with quote

Hello Jacques,

Please check the inside housing of your carburettors. It might be possible that small parts from the inside of the aluminium housing of the carbs get loose, looking like very small folio. When you increase the power of the engine you will have more fuel flow through the carbs and these debris folio swim up and can close the hole of your jet orifices. �
We have had that some years ago on the Demo TriGear from EA/UK. When Andy Draper wanted to start and increased the power, the total rpm drop followed some second later. To found that out by an ROTAX expert, taking about three hours. We assume the reason was Avgas, as the TriGear was getting Avgas and Mogas in a mix, depending on the availability.

Good Luck,
Bruno

-----Urspr�ngliche Nachricht-----
Von: owner-europa-list-server(at)matronics.com [mailto:owner-europa-list-server(at)matronics.com] Im Auftrag von ploucandco
Gesendet: Sonntag, 10. Juni 2012 17:31
An: europa-list(at)matronics.com
Betreff: RPM drop with a 914 above 100%

--> Europa-List message posted by: "ploucandco" <ploucandco(at)yahoo.com>

Hello all,

Recently, I had to about a Take off with my Europa 914 airmaster due to the fact that I was facing an RPM drop above 100%. The ROTAX has less than 330 hours.


I already looked at the following items:
- replaced the fuel with fresh one
- fuel pressure is OK
- TCU - transfer function according to heavy maintenance manual and solenoid gets 12V above 108%, so should be OK
- turbo wastegate fully closes
- air filter cleaned up

The issue is still and my next step is to look at the carbs (membranes have been replaced less than 200 hours ago). Any other ideas? Where should I specifically need to look at the carbs?

The attached file from the TCU log depicts the issue starting from line 989.

Thanks for relevant input.

Jacques




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