Today's Message Index:
----------------------
1. 05:37 AM - Re: Re: 912 with low RPM--- new vibration problem (Thom Riddle)
2. 06:34 AM - Re: Re: 912 with low RPM--- new vibration problem (Bear Creek Aviation)
3. 10:06 AM - Re: Re: 912 with low RPM--- new vibration problem (Les Goldner)
4. 03:50 PM - Re: Re: 912 with low RPM--- new vibration problem (Rich & Sandy Schultz)
5. 06:02 PM - Re: Re: 912 with low RPM--- new vibration problem (Noel Loveys)
6. 10:16 PM - AW: Re: 912 with low RPM--- new vibration problem (Roger Lee)
7. 10:26 PM - Re: 912 with low RPM--- new vibration problem (Roger Lee)
Message 1
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| Subject: | Re: 912 with low RPM--- new vibration problem |
Les,
A couple other ideas:
1) Have you checked the spark plugs to see if one (or more) of the
cylinders is running richer or leaner than the rest? If this is the
case, let us know and I'll tell you about the solution that took me
months to finally find and fix. It was nothing anyone could think of,
including the experts at Lockwood. If not, then no need to go into the
long story.
2) When you disassembled the carbs for jet cleaning etc. did you get
the cylinder and diaphragm back in the right direction? I didn't once
and the result was rough running in the mid range.
Thom in Buffalo
Message 2
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| Subject: | Re: 912 with low RPM--- new vibration problem |
We had a problem with a 582 that was similar. Two things, first there
was crud way up in the jet almost impossible to see without looking thru
it at a bright light, secondly the gas was "decomposing" and no sooner
had we cleaned it out it had started compacting some sort of white
material back into the idle jets. Incidentally, I would never eliminate
any variable, prop, engine, motormount etc, until it was proven
serviceable regardless of it's age/hours
Good luck,
Terry.
Message 3
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| Subject: | Re: 912 with low RPM--- new vibration problem |
Thom,
I changed the plugs at 20-hours after "feeling" the problem. They all looked
the same. I also pulled the new plugs once to check cylinder pressure..
Again, they were all the same.
I never attempted to pull apart the tops of the carbs, so I didn't run into
problems putting back cylinders & diaphragms. I just pulled the bowls and
the jets for cleaning (which they didn't need).
Thanks for trying to help,
Les
> -----Original Message-----
> From: owner-rotaxengines-list-server@matronics.com
> [mailto:owner-rotaxengines-list-server@matronics.com] On
> Behalf Of Thom Riddle
> Sent: Thursday, March 13, 2008 5:34 AM
> To: rotaxengines-list@matronics.com
> Subject: Re: RotaxEngines-List: Re: 912 with low RPM--- new
> vibration problem
>
> --> <riddletr@gmail.com>
>
> Les,
>
> A couple other ideas:
> 1) Have you checked the spark plugs to see if one (or more)
> of the cylinders is running richer or leaner than the rest?
> If this is the case, let us know and I'll tell you about the
> solution that took me months to finally find and fix. It was
> nothing anyone could think of, including the experts at
> Lockwood. If not, then no need to go into the long story.
> 2) When you disassembled the carbs for jet cleaning etc. did
> you get the cylinder and diaphragm back in the right
> direction? I didn't once and the result was rough running in
> the mid range.
>
> Thom in Buffalo
>
> Photoshare, and much much more:
>
>
Message 4
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| Subject: | Re: 912 with low RPM--- new vibration problem |
Did you check the spark gap on each plug?
Is the vibration the same with each mag alone? Worse together?
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Les
Goldner
Sent: Thursday, March 13, 2008 12:04 PM
Subject: RE: RotaxEngines-List: Re: 912 with low RPM--- new vibration
problem
<lgold@quantum-associates.com>
Thom,
I changed the plugs at 20-hours after "feeling" the problem. They all looked
the same. I also pulled the new plugs once to check cylinder pressure..
Again, they were all the same.
I never attempted to pull apart the tops of the carbs, so I didn't run into
problems putting back cylinders & diaphragms. I just pulled the bowls and
the jets for cleaning (which they didn't need).
Thanks for trying to help,
Les
> -----Original Message-----
> From: owner-rotaxengines-list-server@matronics.com
> [mailto:owner-rotaxengines-list-server@matronics.com] On
> Behalf Of Thom Riddle
> Sent: Thursday, March 13, 2008 5:34 AM
> To: rotaxengines-list@matronics.com
> Subject: Re: RotaxEngines-List: Re: 912 with low RPM--- new
> vibration problem
>
> --> <riddletr@gmail.com>
>
> Les,
>
> A couple other ideas:
> 1) Have you checked the spark plugs to see if one (or more)
> of the cylinders is running richer or leaner than the rest?
> If this is the case, let us know and I'll tell you about the
> solution that took me months to finally find and fix. It was
> nothing anyone could think of, including the experts at
> Lockwood. If not, then no need to go into the long story.
> 2) When you disassembled the carbs for jet cleaning etc. did
> you get the cylinder and diaphragm back in the right
> direction? I didn't once and the result was rough running in
> the mid range.
>
> Thom in Buffalo
>
> Photoshare, and much much more:
>
>
Message 5
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| Subject: | Re: 912 with low RPM--- new vibration problem |
As soon as I saw the reference to white material the questions came to mind
1. what are your tanks made of?? 2. Are you flying with ethanol fuel? 3.
Do you premix?
Noel
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Bear
Creek Aviation
Sent: Thursday, March 13, 2008 12:01 PM
Subject: Re: RotaxEngines-List: Re: 912 with low RPM--- new vibration
problem
<bear_creek_lsa@bellsouth.net>
We had a problem with a 582 that was similar. Two things, first there
was crud way up in the jet almost impossible to see without looking thru
it at a bright light, secondly the gas was "decomposing" and no sooner
had we cleaned it out it had started compacting some sort of white
material back into the idle jets. Incidentally, I would never eliminate
any variable, prop, engine, motormount etc, until it was proven
serviceable regardless of it's age/hours
Good luck,
Terry.
Message 6
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| Subject: | Re: AW: Re: 912 with low RPM--- new vibration problem |
Hi Thilo,
Good advice at rpm's below 3500. The enricher does not play a part though above
3500rpm. Certainly not above 4000. If it ran rough below 3500 then the enricher
could be the culprit, but then it should smooth out at cruise rpm.
--------
Roger Lee
Tucson, Az.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=169751#169751
Message 7
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| Subject: | Re: 912 with low RPM--- new vibration problem |
Hi Les,
Doesn't sound like a carb issue anymore since you checked that. You checked the
mags (ignition coils), balanced the carb and checked for clean carbs. It kind
of only leaves one thing. When you rule out everything else then what ever is
left is probably the culprit. My Warp Drive was out of balance since day one.
Has any little nut, bolt or part been changed from the prop hub forward? You
still need to rule out static and dynamic balance. Until the last two things
are done you could chase a ghost for ever. I know you don't want to hear that,
but what else is left.
--------
Roger Lee
Tucson, Az.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=169752#169752
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