Today's Message Index:
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1. 06:47 AM - Re: Rough Running (Catz631@aol.com)
2. 07:40 AM - Re: Rough Running (Robert Borger)
Message 1
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| Subject: | Re: Rough Running |
Hugh,
I had this happen to me on 2 occasions. The first one occurred when I
reversed two of the plug wires when a friend walked into my hanger when I was
working on the plane. I got distracted (won't do that again)
The second one happened when I put new plugs in the engine as you have.
After much checking I finally removed the new plugs and "bomb" checked them
in my friends Champion spark plug checker. I found that one of the new
plugs would not fire when pressure was applied to it. I chucked that plug in the
bin and installed another new plug(after checking it) Problem solved.
Dick Maddux
912UL
Message 2
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| Subject: | Re: Rough Running |
Hugh,
OK, let me add my 2 on the subject. Last year at annual condition inspection I
replaced the plugs on my 914. Ran like a sewing machine before the annual.
Ran rough as a cob after. All the plug wires in the right places. Investigated
the ignition module wiring, OK. Played with balancing the carbs. Nothing
helped. Pulled the new plugs and inspected them, one at a time. One of the new
plugs had a cracked insulator between the center electrode and outer case.
You could see it after the run because the crack was stained brown. Replaced
that plug and the engine ran much better. Smoothed out beautifully when I went
back and rebalanced the carbs.
Check all those new plugs. One or more could be bad. If you have the facilities,
pressure (or bomb) check them as well. If all your plug wires go to the right
place, I bet you have one or two bad plugs.
Blue skies & tailwinds,
Bob Borger
Europa XS Tri, Rotax 914, Airmaster C/S Prop (50 hrs).
Little Toot Sport Biplane, Lycoming Thunderbolt AEIO-320 EXP
3705 Lynchburg Dr.
Corinth, TX 76208-5331
Cel: 817-992-1117
rlborger@mac.com
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