Bristol 100A engine
It's always the top ring that wears out and also opens out it's
groove, so it's conceivable that the ring groove has been turned out
and a wider or more than one ring fitted. I have some Dennis Fire
Engine Pistons here from a Rolls Royce B80 and their top ring is
steel with a Molybdenum coated on its contact surface. This is
because R-R had difficulty persuading drivers to warm the thing up
carefully before driving off!
Ash
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