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Yes, it is at 92 mm bore. I don't recall the liner OD. It must be close to 100 mm, probably a bit under.Have you heard of that mod',
Maybe yours is that way ?.
Seems a bit too big for me, I was hoping to use a normal piston and standard C/Head ?.
Jim Comstock busy busting myths again. Logarithmic Superblends this timeViny4 , I was referring to lipped roller bearings for crankshaft mains - and there is NO thrust to speak of in Vincent engines. So not the least problem to use rollers in this place. I do like them for ease of assembling when having rollers plus cages- plastic PA66 gf certainly - contained in outer races. I have them in the gearbox as well, one ball bearing behind the clutch of course due to side loads there. What the British once called Superblends in Commandos is standard today in SKF or FAG roller types, called logarythmic profile, which is basically rollers polished down at their ends for less edge loads on "flexible" shafts.
In clutch push rods I´d have balls in between sections of tool steel for less friction when pulling the clutch. But you have to have hardened pushrods acting on balls so get some simple throughhardening steel rod and heat to medium red and quench in water, get a big torch for quick heat so you can keep hardness to 1-2 mm .