Spark plugs
#1
Thread Starter
Spark plugs
So, Whats the deal on spark plugs? I have a Midwest T-6 that I just put a G-38 in, an old one with a magnito. I decided it needed a new plug and went to the local saw shop and showed them the old one. He got out his conversion book and said "thats a resistor plug and here is the equivalent".
When I ran it, the ailerons twitched and the more throttle I gave it, the harder over they went. I put the old plug back in and the problem went away.
I guess all resistor plugs are not the same... Do they make aircraft plugs?
bigbird
When I ran it, the ailerons twitched and the more throttle I gave it, the harder over they went. I put the old plug back in and the problem went away.
I guess all resistor plugs are not the same... Do they make aircraft plugs?
bigbird
#3
RE: Spark plugs
I would concur, I don't think you got a "Resistor" plug. He sold you a replacement plug as a substitute. Since he is a small engine repair shop, radio interference isn't something they deal with or worry about. I doubt the lawn tractors have AM/FM stereo or CD players in them yet.
#7
RE: Spark plugs
Did you check the plug gap? It might be set for too large of a gap.
A larger gap results in a higher voltage to bridge the gap and also higher voltages result in more radio interference RFI.
A larger gap results in a higher voltage to bridge the gap and also higher voltages result in more radio interference RFI.
#8
RE: Spark plugs
Check to make sure the plug boot is on all the way. But has this engine been run on this plane without any interference problems before? Maybe something other than the plug?
Richard/Club Saito #635
Richard/Club Saito #635
#10
Thread Starter
RE: Spark plugs
No, the motor installation is a new one, however when I put the old plug back in the problem went away.
The first thing I checked was the boot, it was on all the way.
I did not check the gap, I'll check that too.
Thanks
bigbird
The first thing I checked was the boot, it was on all the way.
I did not check the gap, I'll check that too.
Thanks
bigbird
#15
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RE: Spark plugs
The Vlach units later than 2002 needed the R-type plugs. The ignition relied on spark feedback to run and time properly. Non-resistor plugs would cause erratic running, apart from the radio interference.
#16
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RE: Spark plugs
ORIGINAL: pe reivers
The Vlach units later than 2002 needed the R-type plugs. The ignition relied on spark feedback to run and time properly. Non-resistor plugs would cause erratic running, apart from the radio interference.
The Vlach units later than 2002 needed the R-type plugs. The ignition relied on spark feedback to run and time properly. Non-resistor plugs would cause erratic running, apart from the radio interference.
#18
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RE: Spark plugs
I would surely like to know how that works. There are no direct connection from the spark plug lead to the ignition circuit in the standard ignition circuit. Only thru the coil. There are no feedback connections.