DavidHarris
Well Known Member
I've found three spark plug wires with unusually high resistance and am looking for advice.
I'm doing my second condition inspection on a Vans RV7A with a Superior XPIO360 engine and dual pMags. I'm using BR8ES automotive plugs. The aircraft is flying well and has no obvious ignition issues. The spark plug wires are supposed to have about 180 ohms/foot of resistance, and were in that ballpark on the first condition inspection.
Last night I observed 400-600 ohms resistance for five of the wires, but 1.1k for another, 2.4k for another, and 10k for another. I repeated the 10k measurement many times and kept getting exactly the same value.
I don't know too much about spark plug wires. I'm hoping there might be something simple to repair rather than just replacing three wires. Does anyone on the group have advice of common issues that might lead to these symptoms?
Thank you!
David Harris
I'm doing my second condition inspection on a Vans RV7A with a Superior XPIO360 engine and dual pMags. I'm using BR8ES automotive plugs. The aircraft is flying well and has no obvious ignition issues. The spark plug wires are supposed to have about 180 ohms/foot of resistance, and were in that ballpark on the first condition inspection.
Last night I observed 400-600 ohms resistance for five of the wires, but 1.1k for another, 2.4k for another, and 10k for another. I repeated the 10k measurement many times and kept getting exactly the same value.
I don't know too much about spark plug wires. I'm hoping there might be something simple to repair rather than just replacing three wires. Does anyone on the group have advice of common issues that might lead to these symptoms?
Thank you!
David Harris
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