Today's Message Index:
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1. 05:41 AM - Re: Re: RotaxEngines 912uls power loss on takeoff (FLYaDIVE)
2. 06:03 AM - Re: Re: RotaxEngines 912uls power loss on takeoff (John Cox)
3. 08:40 AM - Re: Engine run on when trying to stop. (Catz631@aol.com)
Message 1
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| Subject: | Re: RotaxEngines 912uls power loss on takeoff |
Paul:
Question: Where is the sensor located in relation to the closest fitting
in the direction of fuel flow?
Why do I ask? Fluid Dynamics 101 - The tap in the feed line must be 7 x
the ID BACK from the nearest fitting.
I'm not going to get into the complete answer but the simple answer is wave
progression with peaks and troughs. If you are too close or at a trough
there will be fluctuations and low pressure readings.
*Barry*
*"Do you know why pilots think they are mechanics? Because they can buy
tools at Home Depot.'*
Message 2
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| Subject: | Re: RotaxEngines 912uls power loss on takeoff |
LOVE that quote! Don't forget to research Matt Dralle's fuel accumulator
as a potential fix along with the 7x I.d. factoid.
John
On Jul 4, 2013 5:44 AM, "FLYaDIVE" <flyadive@gmail.com> wrote:
> Paul:
>
> Question: Where is the sensor located in relation to the closest fitting
> in the direction of fuel flow?
>
> Why do I ask? Fluid Dynamics 101 - The tap in the feed line must be 7 x
> the ID BACK from the nearest fitting.
> I'm not going to get into the complete answer but the simple answer is
> wave progression with peaks and troughs. If you are too close or at a
> trough there will be fluctuations and low pressure readings.
>
> *Barry*
>
> *"Do you know why pilots think they are mechanics? Because they can buy
> tools at Home Depot.'*
>
> *
>
> *
>
>
Message 3
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| Subject: | Re: Engine run on when trying to stop. |
Dennis,
I have had this problem for about a year (or more) now. I have done the
carbs,gearbox shimming,fuel additives,new plugs,bore scoping cylinders for
carbon deposits,high octane boosters/gas,shut down at higher rpms,gone to a
lighter prop( which helped a little),etc..you name it I have done it ALL to
no avail.( I thought I was the only one in the country with this problem)
Now when my engine diesels ,it turns backwards about 3-6 revolutions.( my
theory is that the prop stops at the peak of the"dogs" in the gearbox and
it flips the prop backwards) As a result ,I have to do the valve check to
make sure I don't have any air ingestion in the lifters (I have done it at
least a dozen times and can do this check in my sleep now) I have never
found any air, at least according to the tappet clearance check Rotax
specifies.
I thought about using Velcro to attach my cowl as it would come off easier
during these checks ! (lol)
However, I have not had this problem in the last few months because I have
used a different shutdown method and it appears to be working well.
I now pull the throttle back to about 1500 rpm,shut off one mag then pull
further back to about 1000-1100 rpm then shut off the other mag. This seems
to have solved my problem, even with a warm engine (mine never really gets
hot in my radial nosed Kitfox)
Prior to this method I would shut down at around 1800 rpm and then I
might get the diseling on occasion.
I know the gearbox doesn't like low rpm's but you are only there for a
very short time before the engine quits.
Give this a shot and see if it works for you.
Please let us know.
Dick Maddux
912 UL (400 hrs tt)
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