No Limit Powersports Posted October 17, 2007 Report Share Posted October 17, 2007 The spacer plate (or cut domes) compensates for longer stroke +4mm the 795 pistons have a lower wrist pin hieght to compensate for the long rod (if applicable) usually +5mm Quote Link to comment Share on other sites More sharing options...
gumby6t9 Posted October 17, 2007 Report Share Posted October 17, 2007 So is that a yes on the don't have to use a spacer w/ 795 pistons? I'm a tard... too much work today and my brain is fried! sorry... Quote Link to comment Share on other sites More sharing options...
WALLACE84 Posted October 17, 2007 Report Share Posted October 17, 2007 I would def get the cylinders to your favorite builder and tell him your going with a 4 mill so they can be corrected. Im pretty sure once cylinders are ported for a certain stroke, you cant change them Quote Link to comment Share on other sites More sharing options...
fastbanshee8 Posted October 17, 2007 Report Share Posted October 17, 2007 Do you have to run a spacer plate if you run the wiseco pistons made for stroker motors? The 795 series Wiseco pistons are to be ran if, and only if you are running a +5mm longer rod. And yes, you can get a 4mm stroker, longrod crank. Stock rod length on a Banshee is 110mm, and the longrod is 115mm. The 795 series Wiseco's have the wrist pin moved higher up on the piston, so that the pison will not hit the head. Now for the stroker crank. To be able to run the 4mm stroker crank with your stock cylinders, you have two choices. 1.) Have the domes for your aftermarket head cut, so that the pisons won't hit them, or 2.) run a spacer plate. The 4mm stroker crank has the pin on the crank moved out 2mm, which adds 2mm at TDC, and 2mm at BDC. If you run the 795 series Wiseco's with a stock length rod 4mm stroker crank, your compression will end up being a lot lower, because the 795's are made to accomidate the 5mm longer rods, and you are only adding 4mm of stroke with the crank, so your pistons would end up being 1mm lower in the cylinders, at TDC. Quote Link to comment Share on other sites More sharing options...
thedoctorupton Posted October 17, 2007 Report Share Posted October 17, 2007 Im pretty sure once cylinders are ported for a certain stroke, you cant change them would th port job on a 4mil be like a regular stroke but 2 mil higher and do they cut 2 mil off the domes? Quote Link to comment Share on other sites More sharing options...
fastbanshee8 Posted October 17, 2007 Report Share Posted October 17, 2007 would th port job on a 4mil be like a regular stroke but 2 mil higher and do they cut 2 mil off the domes? Nothing is cut off of the domes, but material is removed from the inside of them, because the pistons come up out of the cylinders 2mm, and go into the domes. The main thing on the port job for a 4mm is that the transfer ports are raised, and lowered 2mm, to get the port timings correct, or so I've been told. Quote Link to comment Share on other sites More sharing options...
RZBansheeMan Posted October 17, 2007 Report Share Posted October 17, 2007 All the port timings need to be altered for the added stroke, and the ports need to be be opened up to support the flow demands of the added displacement, along with appropriate sized carbs, reeds, and pipes. If your a car engine guy, the similarities would be like building a chevy 383 stroker motor, using a stock 350 cam, 2 bbl carb, exhaust manifolds, and single 2" exhaust.... :geek: Quote Link to comment Share on other sites More sharing options...
No Limit Powersports Posted October 17, 2007 Report Share Posted October 17, 2007 Im pretty sure once cylinders are ported for a certain stroke, you cant change them No the cylinders can be changed to get the port timings correct. With a longer stroke the ports will need to be changed...anything can be done even if the cylinder had to be decked anything is doeable maybe not cost effective but doeable Quote Link to comment Share on other sites More sharing options...
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