Today I was assembling the cylinders and pistons onto the engine when a piston ring broke. Normally I would be able to go to the local auto parts place and get a replacement ring set, but since the bus had 88mm over-sized cylinders the rings cannot be sourced locally. The 88mm cylinder set is known to cause alot of problems since the cylinder wall is so thin; so I’m taking this opportunity to replace the cylinders/pistons/rings with the standard 85.5mm size. This makes the engine a ‘1600’ (1584cc) again, with the 88mm cylinders it was a ‘1700’ (1679). No changes had been made to the stock cylinder heads, so the ‘1700’ configuration would have needed racing fuel to run with any longevity. The ‘1600’ will be able to run on regular, or at-worst mid-grade.
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