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Walter,
I always enjoy your thoughtful and reasoned responses.
A couple of questions:
1. Do you have an opinion on the benefits of using radium sparkplugs on a TSIO-550 engine.
Did you mean iridium? If you want to go with radium, I think that you should just get rid of the whole TSIO-540 and go with a full nuclear reactor. Let us know how the weight and balance works out. I am sure that the mileage will be great.
2. I was doing a lean mag check ( while airborne ) the other day.
While airborne is the best place to do a mag check. Here you are really testing the whole ignitions system while not chipping your prop with rocks.
When selecting the right mag the EGT went up enough to activate the caution light on the TIT. When selecting the left wag the EGT only went up a few degrees.
Sounds like a bad or grounded plug. The EGT goes up when the spark plug firing is retarded. If you look carefully, you will also see one of the CHTs decrease. That will help you pin down which cylinder and therefore which plug is causing the problem.
I was expecting to see about a 50 degree EGT rise but not what I actually saw.
Any thoughts you would care to express on why I saw what I saw?
I have seen a bad plug test good on the pressurized tester at my engine shop and yet not fire when in the plane while flying.
Regards,
Lynn Farnsworth
Super Legacy #235
TSIO-550 powered
Race #44
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Lorn H. 'Feathers' Olsen, MAA, DynaComm, Corp.
248-345-0500, mailto:lorn@dynacomm.ws
LNC2, O-320-D1F, 1,100 hrs, N31161, Y47, SE Michigan
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