ya i didn't really know what was considered a large bore...their doing it to correct the piston damage or somethin so im guessing its not gonna be dramatic but they said their gonna bore all the cylinders the same so im guessing even if it isn't much it will give me a little extra power. i was hoping they weren't gonna bore it too much otherwise like you said....block sleeves...which aren't cheapTegSox said:
ya i'de love to go with some upgrades but it isn't my money and they bought like a straight up engine part kit with new pistons, rods, bearings,crankshaft, everything so i don't know what pistons are gonna be put in thereOminous G2 said:
The intended purpose of boring cylinders is to remove cylinder wall damage, because they need to be perfectly smooth and symmetrical to achieve proper compression. Piston to wall clearance is measured in thousandths of an inch, it has to be exactly right for piston rings to seal correctly, which affects everything from engine power output to exhaust emissions. But some people (like megsr_boarder said:
) just do it for a little added displacement, an easy power increase if your replacing factory pistons with aftermarket pistons anyway. Whatever it was that did in your engine caused cylinder wall damage, so they're boring the cylinders out to remove the damage. They more than likely won't be boring it out so much that it'll need to be sleeved, for almost the same money you could just get a new block. I believe the most they can bore them out and still use stock pistons is .50mm over factory bore, maybe 0.75mm. Honda makes oversized factory pistons just for this purpose. Oversized stock GSR pistons is more than likely what you'll be getting. Same compression ratio, just a touch more displacement.