Today's Message Index:
----------------------
1. 04:18 AM - Re: 582 compression (Thomas R. Riddle)
2. 05:08 AM - Rotax 912 UL "P" leads (Catz631@aol.com)
3. 08:42 AM - Re: Rotax 912 UL "P" leads (Roger Lee)
4. 02:43 PM - Re: Rotax 912 UL "P" leads (Kyle)
5. 08:29 PM - Re: 582 compression (Noel Loveys)
6. 08:32 PM - Re: 582 compression (Noel Loveys)
Message 1
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| Subject: | Re: 582 compression |
Differential compression test is the better way to go and should be
done with the engine warm. After all, you fly the airplane when the
engine is warm, no? The numbers you get will frequently be lower when
done cold. The numbers you get on one day can be a little different
from what you get on another day due to rings walking a bit during
engine operation, but not dramatically so.
Message 2
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| Subject: | Rotax 912 UL "P" leads |
I have been having a problem with the mag check during my engine runup . The
drop on each mag is about 100-125 rpm but the left mag has a lot more
roughness. I checked the plugs and they are clean.I could not find any breaks in
the P
lead wiring.
I swapped the P lead wires and found that the roughness then went to the
other mag which would indicate to me that the problem is in the wiring and not
the modules. Am I correct?
I would like to replace the P lead wiring. The type that I currently have on
the engine looks like a blue coax type cable. It is shielded and the
shielding is grounded to the frame.The two P lead wires are housed internally in
the
one cable.
The Rotax installation manual (May 01/2007) calls for 18 AMG shielded
flexible cable with both ends grounded to prevent EMI (e,g. MIL-27500/18) It also
cautions that the wrong cables could cause the engine to shut down due to EMI
and radio interferance. Not a good thing.
As a precaution I would like to replace this cable. Should I use two
cables,one for each mag rather than have two leads in one cable? Anyone know a
good
source?
Thanks !
Dick Maddux
Kitfox 4-1200
Rotax 912UL
Pensacola,Fl
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Message 3
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| Subject: | Re: Rotax 912 UL "P" leads |
Hi Dick,
Here is an easy way and a tool to check your plugs and plug wires. Here is a picture
of a AC tester, cost about $12. Spark plugs are AC current. This tester
works by just getting the plastic probe next to the item you want to test. Start
the engine with someone you trust at the controls and chock the tires. Then
while the engine is running hold this tester up by each plug wire and then the
plug. If you are getting a good current flow the light on the tester will light
up steady. If you have a problem wire or plug the light may flash intermittently
or not at all. This way you can trace down the exact place where the problem
is occurring. You can test each plug wire coming out of the ignition modules
and trace it down to the plug. The plug wires coming out of the ignition
coils are screwed in just like they are at the plug cap. I think you will find
your problem in the wires. I had a problem like this 4-5 months ago and the
tester traced it to the #1 plug wire at the plug cap. I unscrewed the wire trimmed
off about a 1/4" and screwed it back in and the problem was gone.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Service Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=195869#195869
Attachments:
http://forums.matronics.com//files/ac_tester_1_110.jpg
http://forums.matronics.com//files/ac_tester_860.jpg
Message 4
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| Subject: | Re: Rotax 912 UL "P" leads |
Roger,
Where do I start looking for one of these AC testers? Is that a parts store item,
a Harbour Freight item, Lowes or Home Depot?
My 912 UL wants to stumble between 3,000 and 3,400. I think it's electrical but
not sure.
Thanks,
--------
Kyle Dunn
Eddyville, Kentucky
Kitfox IV 1200 912 Rotax
1978 Cessna 172 N
American Aero Phoenix II w/582 Rotax
Rotorway Exec.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=195911#195911
Message 5
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Good point! But even with a slightly oversize orifice you will be able to
tell if your compression is good or not so good. One thing I didn't mention
is it is recommended to be a two or more man job. The cylinder under test
has to be held at TDC while the reading is being made. It is surprising
exactly how quickly a prop will get away from you if you aren't careful
holding at TDC. The better the compression, the bigger the bore, the more
careful you will want to be. I was surprised to find a differential meter
set at a local auto supply shop the other day.
Noel
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of
rparigor@suffolk.lib.ny.us
Sent: Wednesday, July 30, 2008 12:58 PM
Subject: RE: RotaxEngines-List: 582 compression
Hi Noel
"I recommend using a differential
> pressure meter. Feed it with 80 psi of air and read the differential
> pressure with the piston being read at TDC. Readings of 70 or better are
> considered execlent."
Just a quick note on differential meters, I know on the 914 Rotax
specifies how large the supply orifice needs to be on the differential
meter.
Lets go extremes for a minute, take a differential meter designed for a
diesel with a 3 foot diameter piston and take a compression test on a
Model Cox .010cu" with the piston not even in place, you will probably
show pretty good compression.
If you use a differential meter for a Lyc or a Cont with too large of a
supply orifice on a 914 the reading can show 80 over 80 even with a
problem.
On the other hand if you use too small of a supply orifice for Lyc or
Cont, can show low even without a problem.
Ron Parigoris
Message 6
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More great points! When I made the original post I really expected to get a
little flamed for suggesting the differential Pressure gauge. You guys are
really on the ball!
Noel
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Robert C
Harrison
Sent: Wednesday, July 30, 2008 2:23 PM
Subject: RE: RotaxEngines-List: 582 compression
<ptag.dev@tiscali.co.uk>
Noel/all
If you use a differential compression meter then please ensure someone
holds the propeller tight on Top dead centre before you feed the
compressed air to the cylinder ....otherwise you could get a severe
crack on the head.
Better be safe. If you are using this kit on a four stroke engine then
get a medical stethoscope, fit a length of small diameter pipe to it to
listen up the carb, up the exhaust pipe and lastly down the oil filler
on a wet sump engine (this will identify where the gas is escaping and
so highlight the likely fault. On the Rotax with the dry sump there's no
where to listen for the rings passing gas, but if it's not loosing gas
from carb or exhaust then piston rings are all that's left to leak !
Regards
Bob Harrison
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Noel
Loveys
Sent: 30 July 2008 15:26
Subject: RE: RotaxEngines-List: 582 compression
<noelloveys@yahoo.ca>
For the reasons you mentioned, irregularities in speed of turning over
the
prop (crank) and weird things that happen to the seal the rings make to
the
cylinder read differently with heat. I recommend using a differential
pressure meter. Feed it with 80 psi of air and read the differential
pressure with the piston being read at TDC. Readings of 70 or better
are
considered execlent.
Used on four stroke engines the Differential meter will also detect and
help
diagnose bad valves as well as bad rings or cylinders. Two strokes
obviously don't have the valve trains so the only thing left is the ring
seals.
Noel
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of
droadrunner@juno.com
Sent: Wednesday, July 30, 2008 11:16 AM
Subject: RotaxEngines-List: 582 compression
What is a satisfactory compression on a 582?
Should it be checked with the engine warm?
Should it be checked by pulling the prop through or using the starter to
actually spin the prop?
Is the compression test a good indicator of the need for an overhaul?
Thanks,
Marlin
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