Re: Perkins 107/108 oversize rings.
I've never heard of just going oversize with the rings. Oversize has always meant a rebore of the engine with new larger pistons with rings to match. With wear, the cylinders get out of round and wear so there is a ridge where the rings top out. Need to bore out the cylinders to get rid of the ridge and roundness back which necessitates larger pistons. Also, the ring glands in the pistons wear oversize so reusing the piston in a rebuild is usually a no no.
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Peter O.
'Ae'a, Pearson 35
'Ms American Pie', Sabre 28 Mark II
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