No Limit Powersports Posted December 5, 2006 Report Share Posted December 5, 2006 (edited) The different series piston is used to compensate for the longer rod length thus you can drop in a long rod crank with a different pistion and the port timings will remain unchanged. A cut dome 2mm step (because with a stroker the pistons now actually move farther up and down), plus whatever step (squish) desired, to compensate for a +4 mm stroke +2 up +2 down for a total of +4 thats why on a +4 stroke longrod you need a different piston and either a spacer plate or a cut dome but with either way the port durations need to be correct. Now cubs on the other hand are different cause the deck height are already cast into the cylinder for the different strokes so no plate no offset dome Edited December 5, 2006 by bansheestang Quote Link to comment Share on other sites More sharing options...
Bansh-eman Posted December 5, 2006 Report Share Posted December 5, 2006 the first post was in fact wrong the offset is 2mm not 4... but the messurement of the spacer is 4mm and the pistons are 2 with the domes being the other 2... me not know why... but yup i passed bum scoop on the stroke Quote Link to comment Share on other sites More sharing options...
sheefreak Posted December 5, 2006 Report Share Posted December 5, 2006 I am confused by what you are saying about the spacer plate and domes. You only have to run one or the other. But if you run the domes, then your port timing needs to be addressed. The pin location of the 795 series piston is different to compensate for the longer rod. If you run just the stroker w/the 110 rod, a 795 series piston is not needed and the option for either a spacer plate or domes and port work remains the same. I think we are confusing the poor guy. Quote Link to comment Share on other sites More sharing options...
Bansh-eman Posted December 5, 2006 Report Share Posted December 5, 2006 (edited) i saying the spacer plate messures 4mm, not 2mm... and the domes are cut 2mm as well as the pistons having the rod moved 2mm higher as well making that 4mm... not 2mm the stroke how ever is only 2mm offset making the total 4mm like you said.. so why are these parts making up for 4mm and not 2? i know the one guy said for squish and what not but that shouldnt matter casue your rasieing both 2mm the gap should remain the sme.. Edited December 5, 2006 by Bansh-eman Quote Link to comment Share on other sites More sharing options...
No Limit Powersports Posted December 5, 2006 Report Share Posted December 5, 2006 you use either a spacer or a dome with a offset for the additional stroke typically not both (i suppose you could do like a partial spacer and a partial offset then get the ports right but lol) if it is a long rod you use a different piston, if it is a stroker then you do the plate OR the domes, if it is both you do both. all your trying to do is either get the deck height back close to factory so the piston doesnt crash into the head or cut the dome so it doesnt. Essentially all a stroker does is add displacement. Quote Link to comment Share on other sites More sharing options...
sheefreak Posted December 5, 2006 Report Share Posted December 5, 2006 Your extra stroke on top and bottom are still taking place above the casses. Quote Link to comment Share on other sites More sharing options...
Bansh-eman Posted December 5, 2006 Report Share Posted December 5, 2006 (edited) your saying if you have a 5mil longrod 4mil stroker you got to run spacer plate and domes? if so thats wrong... i run a 5m lr 4m s and all you need is 795s and domes... Your extra stroke on top and bottom are still taking place above the casses. the piston is only being moved 2mm higher if the offset is 2mm so why is is everything making up for 4mm? the plate makes up for 4mm the domes makeup 2mm and the 795s makeup another 2 totaling 4mm... Edited December 5, 2006 by Bansh-eman Quote Link to comment Share on other sites More sharing options...
sheefreak Posted December 5, 2006 Report Share Posted December 5, 2006 Noone said that you needed to run both. Actually I thought that you were implying that you need both. I am not sure where you are getting that the 795's make up for 2mill. They make up for the long rod, not stroke. As I mentioned before, if you run the 110 rods instead of the 115's(longrod)on your 4 mill stroker you don't need the 795's. I can't answer your question on the spacer plate as I have never run one. Are you sure they are 4mill? Never touched one, let alone measure one. Quote Link to comment Share on other sites More sharing options...
No Limit Powersports Posted December 6, 2006 Report Share Posted December 6, 2006 you use either a spacer or a dome with a offset for the additional stroke typically not both (i suppose you could do like a partial spacer and a partial offset then get the ports right but lol) if it is a long rod you use a different piston, if it is a stroker then you do the plate OR the domes, if it is both you do both. all your trying to do is either get the deck height back close to factory so the piston doesnt crash into the head or cut the dome so it doesnt. Essentially all a stroker does is add displacement. your saying if you have a 5mil longrod 4mil stroker you got to run spacer plate and domes? if so thats wrong... i run a 5m lr 4m s and all you need is 795s and domes... the piston is only being moved 2mm higher if the offset is 2mm so why is is everything making up for 4mm? the plate makes up for 4mm the domes makeup 2mm and the 795s makeup another 2 totaling 4mm... Looks like to me i said not both i said you need both as in a 795 piston for the rod and a spacer OR a dome for the stroke Quote Link to comment Share on other sites More sharing options...
JaysonP Posted December 6, 2006 Report Share Posted December 6, 2006 (edited) Looks like to me i said not both i said you need both as in a 795 piston for the rod and a spacer OR a dome for the stroke so was i right on the 2mil up and 2mil down? heh...im confused now guys... i still think just a base stack on a motor with such great stroke length would be better than cutting your heads...that way the piston still meets its normal length into the top of the cylinders it may go lower into the cases further out of the pistons...thus opening the transfers at the stock timing along with the boost ports and the exaust but it will open the ports for a longer duration....adding the base stack lessens your chance of "freeporting" the exaust port also. yes cutting the domes would halp bring the snap back, but isint the point of a stroker to bring broader power, hence the motor is closer to "(square)". i do stand corrected by saying running a base stack lesns port timing, i was wrong. theyare open more and longer but my explination above backs me up. haha. i suffer from thinking to fast for my own good. eek! Edited December 6, 2006 by JaysonP Quote Link to comment Share on other sites More sharing options...
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