9banshee6 Posted July 10, 2010 Report Share Posted July 10, 2010 why do some people go with just like a small bore with pistons like .30 why not go full bore for like an extra 30 does it depend on your mods?? is boreing the cylinder expensive?? Quote Link to comment Share on other sites More sharing options...
SAVAGE420 Posted July 10, 2010 Report Share Posted July 10, 2010 .030 over is not a big bore, thats not even 1mm over (.75 mm). Only bore your jugs "if" needed. Theres really no more gained power when you bore them out. If you want power, get your jugs ported and or get a 4mill long rod. Some guys even run small bore pipes on larger motors, cubs ect ect, its what some builders like them to run, its all about set up. If and when you "have to" go up to the next bore, just do that and go 1 more bore as needed. Bore/hone costs ranges from 30-60 per hole, depending. Follow? Quote Link to comment Share on other sites More sharing options...
fastquad02blaster Posted July 11, 2010 Report Share Posted July 11, 2010 why do some people go with just like a small bore with pistons like .30 why not go full bore for like an extra 30 does it depend on your mods?? is boreing the cylinder expensive?? You just want to go with what you need to on a rebuild. That way you have some cylinder wall left for the next rebuild. IMHO. Longer stroke equals more power. Quote Link to comment Share on other sites More sharing options...
9banshee6 Posted July 12, 2010 Author Report Share Posted July 12, 2010 You just want to go with what you need to on a rebuild. That way you have some cylinder wall left for the next rebuild. IMHO. Longer stroke equals more power. oohh thanks now i know clearly Quote Link to comment Share on other sites More sharing options...
9banshee6 Posted July 12, 2010 Author Report Share Posted July 12, 2010 You just want to go with what you need to on a rebuild. That way you have some cylinder wall left for the next rebuild. IMHO. Longer stroke equals more power. so if im on stock cylinders and stock pistons and need a rebuild i cant go with stock pistons anymore cause my cylinders are going to be worn out right now im going to have to go with something a little bigger right. Quote Link to comment Share on other sites More sharing options...
Jereme6655 Posted July 12, 2010 Report Share Posted July 12, 2010 correct....when its time to do a re-build you need to buy larger pistons. the best way to do it is to take the cylinders to the machine shop that your going to have the work done at and either they can order you the correct sized piston or they can measure it and tell you what size piston to order. Either way make sure you take the cylinders to them FIRST before you try and buy new pistons. Quote Link to comment Share on other sites More sharing options...
spurdy Posted July 12, 2010 Report Share Posted July 12, 2010 Stock cylinders are a 64mm bore. The life of your cylinders is in the material available to overbore. You can safely bore up to 66mm (2mm over stock or 0.080"). Some go to 66.25mm or 0.100" over with good luck but your cooling jackets get pretty thin. As said before, your cylinders need to be measured for taper and oblong as well as gouges to see who far they will need to be bored so evaluate the cylinders before ordering pistons. Usually, the shop that bores them can provide you with the correct pistons for you. Again, just to reiterate, there is no power gain from running a bigger piston in this sense. The increased CC size in minimal. Best routes for more power are timing, pipes, porting, increased fuel and intake, increased stroke, then after market cylinders. Not necessarily in that exact order (depends on needs and set up) but pretty close. Keep in mind that the best set up will be built as a unit with each part complimenting the others. Everything goes hand in hand. SP Quote Link to comment Share on other sites More sharing options...
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