Kevin,
Mine is a mono about to fly again having been re-kitted!
It has done the same number of hours as yours and I am confident that your
problem will require the solution suggested. By the way I too am impressed
with this engine, its throttle response and vibration level are more akin to
an electric motor, and you don't have to send it back to Austria every
thousand hours! It got some bad press through poor accessory installation
and instructions but the new output module for the re-drive seems to have
cured some early failures.
----- Original Message -----
From: "Kevin Taylor" <kevin@islandtelecom.co.uk>
Subject: Re: SUBARU Low RPM rough running
> Gary,
>
> Thanks for taking the time to reply and share your experiences. I've got
the
> plane at home at the moment to carry out a few jobs on it and so far
haven't
> got around to investigating this yet other than having removed the plugs
and
> seeing the engine is running very rich. In the 50 odd hours ive done
(since
> getting the machine which has 200 ish hours on the engine)so far the plugs
> have a nice tan colour which previously suggested I had the right leaning
> technique. So either there is a problem or possibly I have allowed it to
run
> too rich for too long. My engine is set up to be rich and does need
leaning
> even on the ground. I have flown one other Subaru and that was exactly the
> same so I believed this is the norm? I will carry out the test you suggest
> thanks and let you know.
>
> Are you on a mono or tri?
>
> I have a tri and a VP prop and its a lovely smooth engine and gives me 110
> kts at 16 litres per hour at 3300 RPM. Some photos and info at
> www.ukmicrolights.com
>
> Regards
>
> Kev T
> PS I'm up for creating a Subaru owners database/newsletter if your
> interested? Anyone else up for it?
>
> -----Original Message-----
> From: forum-owner@europaclub.org.uk
> Subject: Re: Low RPM rough running
>
>
> Kevin,
> I recently had a similar problem whilst ground running my Subaru. I
> suspected the excess fuel being a fault in the diaphragm so switched
> Elisions with my spare Subaru engine. Fault cleared so I opened the
> diaphragm housing to find a waxy residue causing the ball valve to stick
in
> the open position, the one the diaphragm drives.You can check for this
fault
> easily by removing the air filter box and running the pump with the
mixture
> rich and throttle closed engine stopped . There should be no fuel exiting
> the meter needle in the throttle body. Run it and cycle the throttle
whilst
> an observer looks for any fuel excess. If this is your problem you will
see
> the fuel squirting out of the throttle body venturi against the incoming
air
> whilst at idle. Without the air filter housing it may even keep running in
> this config but with air filter it will rich cut. If you blow through a
> narrow tube into the small hole on the right of the throttle venturi
> casting, this will open the diaphragm and allow fuel through without
running
> the engine. If fuel flows after your stop blowing, then that's your
problem
> and you will have to open the sealed diaphragm housing voiding the
warranty
> if it is still valid to fix it here or send it back to Ellison. If you get
> it to me I will fix it for you providing the above symptoms agree. Let me
> know your findings regardless.
>
> Gary McKirdy
> ----- Original Message -----
> From: "Kevin Taylor" <kevin@eastyorkshire.co.uk>
> Subject: Low RPM rough running
>
>
> > Folks,
> >
> > I had a intermittent problem today with rough running at low rpm
2500-3000
> > rpm on my Subaru. It cleared by leaning the engine then going back to
> fully
> > rich was then OK again apart from once or twice but generally I was able
> to
> > replicate it enough times to confirm leaning did solve the problem. The
> > first time I noticed it was immediately on start up from cold on the
first
> > run of the day, it got rough I leaned it then put it back to fully rich
> and
> > it stopped! I'm thinking along the lines that it may be possibly plug
> > fouling or just somehow the slow running jet is too rich? I haven't had
> the
> > plugs out yet but will next time I'm at the field. I incidentally it
does
> > run rich and always has done other Subaru owner I have spoken to have
> always
> > leaned even on the ground, to assist in avoiding fouling.
> >
> > Its been as sweet as a nut since I got it and I've done 50 hours in the
> last
> > 3 months and never seen a suggestion of this before. Plugs are only
about
> > 15-20 hours old.
> >
> > Any suggestions appreciated (other than put a 912 in which I'm sure some
> of
> > you are muttering under your breath right now)
> >
> > Kev T
> > ---
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> >
> >
>
>
> ---
> Version: 6.0.400 / Virus Database: 226 - Release Date: 09/10/02
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> ---
> Version: 6.0.400 / Virus Database: 226 - Release Date: 09/10/02
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>
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