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JohnF
Joined: 13 May 2010
Posts: 124
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 Posted: Wed Jun 06, 2012 9:58 am Post subject: Strange Problem |
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Rotax 9112 ULS in an RV-12.
Operation completely normal.
Began/completed annual condition inspection.
New spark plugs...gapped to 0.023" type per Rotax manaul
New fuel pump with the drain fitting installed.
Air filters serviced w'/ K&N "oil"
Carbs attached tightly.
Air filters attached correctly.
Enrichment (choke) operation normal...stop to stop.
Throttle normal.
Carb springs checked.
On run up, mag drop 350 rpm; normal was around 150. Both sides.
Static RPM 3800 then more throttle reduced rpm and engine ran rough.
Found one spark plug off (fell off or didn't get put back on...don't know which)
Ran on ground....all OK Static RPM 4975, mag drops 150 or less; both the same
Put cowling back on the went to fly this morning.
Same problem...static rpm way too low, as above
Mag drops 350 or so....
Aborted flight attempt.
:Pulled all plugs...gaps all OK. All VERY back...less than one hour on new plugs. Reinstalled the plugs.
Ran engine...normal rpm; normal mag drop,
Fuel pressure was 5.1psi with original fuel pump; runs 6.8 psi with new pump.
Pulled fuse on boost electric pump while engine running...no change in psi.
Engine now running great..starts instantly....rpms all normal...fuel flow normal...
I don't know what's going on...am very concerned about this problem coming and going with nor apparent (to me anyhow) reason.
Your guesses/hints/surmises all would be appreciated.
Looks like a clasic case of "It was working 'til I fixed it!"
John
[quote][b]
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Wed Jun 06, 2012 2:16 pm Post subject: Re: Strange Problem |
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Hi John,
Your plug gaps are too tight for summer weather. Open the gaps to .027 and the mag drop will change. In addition you may have too much oil on the air filter which is a very common error. It needs the lightest of a spray. So light you should still see some of the white gauze underneath. The oil will spread with the air flow. Too much oil restricts air flow more than you may think. Too much oil reduces the air flow. Change these two things and I think it will be good to go.
p.s.
Your WOT setting flat and level at your average altitude should be between 5500-5600 for the best overall performance that would encompass several items.
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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williamtsullivan(at)att.n
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| Posted: Wed Jun 06, 2012 3:34 pm Post subject: Strange Problem |
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Roger, you may have answered my problem as well. I installed a brand new, pre-oiled K&N filter on my 447, and the static rpm was only 5100. It should have been about 6500. I did notice lots of oil on the new one, and wondered about that. I'll put the old filter back on, and see what happens. When it stops raining.
Bill Sullivan
Windsor Locks, Ct.
Kolb FS, 447
--- On Wed, 6/6/12, Roger Lee <ssadiver1(at)yahoo.com> wrote:
[quote]
From: Roger Lee <ssadiver1(at)yahoo.com>
Subject: Re: Strange Problem
To: rotaxengines-list(at)matronics.com
Date: Wednesday, June 6, 2012, 6:16 PM
--> RotaxEngines-List message posted by: "Roger Lee" <[url=/mc/compose?to=ssadiver1(at)yahoo.com]ssadiver1(at)yahoo.com[/url]>
Hi John,
Your plug gaps are too tight for summer weather. Open the gaps to .027 and the mag drop will change. In addition you may have too much oil on the air filter which is a very common error. It needs the lightest of a spray. So light you should still see some of the white gauze underneath. The oil will spread with the air flow. Too much oil restricts air flow more than you may think. Too much oil reduces the air flow. Change these two things and I think it will be good to go.
p.s.
Your WOT setting flat and level at your average altitude should be between 5500-5600 for the best overall performance that would encompass several items.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center - Heavy Maint. Rated
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=374895#374========================http://www.matrop://forums.matronics.com" bsp; -Matt Dralle, List Adontribution" target="_blank">http://www.matronics.com/contribution [quote][b]
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Thu Jun 07, 2012 8:53 am Post subject: Re: Strange Problem |
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Hi Bill,
If its factory oiled it won't have too much.
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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williamtsullivan(at)att.n
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| Posted: Thu Jun 07, 2012 9:10 am Post subject: Strange Problem |
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Roger- Mine was factory oiled, but seemed to be sopping wet. I put a plastic bag over it for the winter, and the plastic seemed to adhere to the oil. I'm going to check, whenever I get dry enough weather.
--- On Thu, 6/7/12, Roger Lee <ssadiver1(at)yahoo.com> wrote:
[quote]
From: Roger Lee <ssadiver1(at)yahoo.com>
Subject: Re: Strange Problem
To: rotaxengines-list(at)matronics.com
Date: Thursday, June 7, 2012, 12:53 PM
--> RotaxEngines-List message posted by: "Roger Lee" <[url=/mc/compose?to=ssadiver1(at)yahoo.com]ssadiver1(at)yahoo.com[/url]>
Hi Bill,
If its factory oiled it won't have too much.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center - Heavy Maint. Rated
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com-> http://www.matronics.com/Navigator?RotaxEngines-List --> [quote][b]
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Thu Jun 07, 2012 3:08 pm Post subject: Re: Strange Problem |
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Over oiling is a very common problem with K&N air filters, but usually not from the factory.
When you spray one of these filters it does not need to cover every inch of the gauze and it needs only the lightest of sprays. Just enough to turn the element reddish and you should be able to see some of the white gauze. The oil will spread like crazy and migrate every where so a tiny amount means a better air flow.
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http://www.matronics.com/Navigator?RotaxEngines-List |
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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ronlee
Joined: 25 Dec 2006
Posts: 141
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| Posted: Fri Jun 08, 2012 6:55 pm Post subject: Re: Strange Problem |
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Check that all the spark plug wires are on the correct cylinder. Mine came in the crate with two wires switched and I had the same problem of a big mag check drop. It ran just fine with that situation otherwise.
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Ron Lee
Tucson, Arizona |
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JohnF
Joined: 13 May 2010
Posts: 124
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| Posted: Sat Jun 09, 2012 3:54 am Post subject: Strange Problem |
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Thanks for the tip, Ron. I have double checked the spark wires, but will do
it a third time. Again, thanks for the help.
John
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