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Spark plug size ???

D

DAVE C

Well-known member
looking for spark plug size for 0540 lycoming for cht sensor they list them for 10mm 14mm and 18mm denso plugs Thanks
 
18 mm spark plug threads. Note that I have found the spark plug base temp readings (using laser heat gun, not ring CHT) to be 50 to 100 Deg F less than the bayonet CHT's that Lycoming specifies.
 
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