I'm having a transient vibration in my engine. Some days it runs smooth as silk, other days I have this odd vibration that I can't seem to get rid of, no matter the mixture or rpm settings. My A&P tells me that it is almost certainly a mag or ignition harness problem.
Any thoughts? Also, what about replacement mags? Any newer products that have STC's for replacing the old mags?
Hoog
Magnetos
Moderators: GAHorn, Karl Towle, Bruce Fenstermacher
Try cleaning or replacing your spark plugs before you
spring for a set of mags.
The plugs can test fine in a tester (under pressure) but
the testers I've seen cannot apply the pressure / heat /
stress the plugs are exposed to during cruise flight.
I had a plug going in and out (working, then not) in the
air. All 12 tested fine on the ground. Bought a new set
of plugs, and.... presto....
Bela P. Havasreti
'54 C-170B N170BP
spring for a set of mags.
The plugs can test fine in a tester (under pressure) but
the testers I've seen cannot apply the pressure / heat /
stress the plugs are exposed to during cruise flight.
I had a plug going in and out (working, then not) in the
air. All 12 tested fine on the ground. Bought a new set
of plugs, and.... presto....
Bela P. Havasreti
'54 C-170B N170BP
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- Posts: 2271
- Joined: Tue Apr 23, 2002 12:11 am
Ditto Bela's comments re: plug replacement. Look in the logbooks & try to figure how many hours on yours. Last spring,my airplane REFUSED to start--I tore into the mags as it appeared to be a weak spark problem. Mags were OK,I then replaced the plugs which had about 450 hours on them and looked & tested OK--that did the trick! I found the Alison/Autolite plugs to be cheaper by a couple bucks each. But they need a deeper socket than do the champions,what I saved on plugs I ended up spending on a deeper (1/2" drive) deep socket.
Eric
Eric
I'll ask!
Hey, that's a good point too! We went flying yesterday, and he acknowledges the transient, so it's not just a figment of my imagination (you know, the autorough that happens the minute you are over terrain where there's no really suitable place to put her down in a pinch). So, we're into the troubleshooting phase big time.
Thanks.
Thanks.
Hoog
N65BB -- 1948 Ragwing
N65BB -- 1948 Ragwing