Sirnixalot said:87mm should be the limit if you want to keep the block. 87.5mm will have taken you to th emaximum limit. no more honing or finishing the cylinder walls after that if you crack a piston and score the cylinder, you have to get new liners.
I would only go larger than 87mm if the sleeves were being replaced. Darton offers these sleeves for cheap but its the machining that gets you. Installing liners is a very very very easy job to screw up.
An oversquare motor is more rev happy.
Rishi while i agree that the larger the piston of the same material the more the reciprocating mass. Comparing a 87mm forged piston to an 86mm cast piston, you will find the forged one to be quite a few grams lighter.
All this being said i know that there are at least 4 motors in the US running a 90mm bore, some with a Tomei 91mm (could be 92mm, i dont remember) stroke crank.
Now that my friends is a stroker :shock:
AJ4 said:I had a look at Darton sleeves a while ago, man, they are beautiful. Seems almost a shame to fit them, I'd rather just keep them on my desk and droll over them.
I need to get out more.
P.s, how does 91 x 96 grab you ?