Originally Posted by Biggles
Going back a few years when I was in to motorbikes all my mates used to get their cylinder bores skimmed and put oversize piston rings on. This used to give them more HP. Doesn't anyone do that in the boat world ?
That is going back a few years .I doub't you could have measured the increase a re bore gave but owners always claimed it had more power , main reason was the engine had been restored to new condition and they were used to a knackered engine .
It doesn't happen so much these days as most decent engines have plated bores so a new piston and rings is the normal way or a new or barrel if the its been damaged