Okiepred Posted November 19, 2012 Report Share Posted November 19, 2012 I just purchased a stock cylinder 4mil topend and apparently it's for a 4mil short rod and I have a 4mil long rod! The pistons stick out of the top of the cylinders about an 1/8"! Can I use a 4mil spacer plate and be ok? Any help would be greatly appreciated! Thanks Quote Link to comment Share on other sites More sharing options...
n2otoofast4u Posted November 19, 2012 Report Share Posted November 19, 2012 Id use long rod piston before a space plate! Quote Link to comment Share on other sites More sharing options...
Okiepred Posted November 19, 2012 Author Report Share Posted November 19, 2012 Ok wasn't sure! It's a stock cylinder setup done from k&t that's a 70.50mm bore if that makes a difference! Thanks Quote Link to comment Share on other sites More sharing options...
Starwriter Posted November 19, 2012 Report Share Posted November 19, 2012 (edited) Uh, you better take a closer look at what you have. A 4 mil is supposed to end up with the piston 2 millimeters(.078") (a little short of "about" an 1/8")out the top of the cylinder. If you have long rods, and do NOT have long rod pistons, you would have the pistons 2 mil + 5 mil =7 mil (.275") (over 1/4") out the top of the cylinder Edited November 19, 2012 by Starwriter Quote Link to comment Share on other sites More sharing options...
n2otoofast4u Posted November 19, 2012 Report Share Posted November 19, 2012 uhhh. Yeah you need to investigate a little more. Whats the number thats on the pistons you have now? Quote Link to comment Share on other sites More sharing options...
Okiepred Posted November 19, 2012 Author Report Share Posted November 19, 2012 The number on the piston is 8963! 70.45mm it sticks up maybe an 1/8" if that Quote Link to comment Share on other sites More sharing options...
Starwriter Posted November 20, 2012 Report Share Posted November 20, 2012 Apparently that's a Trinity big bore set up that uses bigger Blaster style pistons specially made by Wiseco for Trinity. So, the Blaster style piston has the correct pin height for a long rod, but uses a different dome angle than Banshee pistons. Did you get a head or domes with it? If so, bolt it on and check the squish. If not, you're gonna have to get domes cut. I could be totally out in left field with this, but that's what it seems like to me. Quote Link to comment Share on other sites More sharing options...
AKheathen Posted November 20, 2012 Report Share Posted November 20, 2012 if you have the wrong pistons, the rings would pop out of the top, iirc. Quote Link to comment Share on other sites More sharing options...
Okiepred Posted November 20, 2012 Author Report Share Posted November 20, 2012 Sent from my SAMSUNG-SGH-I747 using Tapatalk 2 Quote Link to comment Share on other sites More sharing options...
Okiepred Posted November 20, 2012 Author Report Share Posted November 20, 2012 The rings does not pop out! The pic above is at tdc Sent from my SAMSUNG-SGH-I747 using Tapatalk 2 Quote Link to comment Share on other sites More sharing options...
n2otoofast4u Posted November 20, 2012 Report Share Posted November 20, 2012 did you get domes for this setup? Quote Link to comment Share on other sites More sharing options...
Okiepred Posted November 20, 2012 Author Report Share Posted November 20, 2012 I have a stock cut head that was being ran with this setup! It was being ran on a 4mil! Quote Link to comment Share on other sites More sharing options...
n2otoofast4u Posted November 20, 2012 Report Share Posted November 20, 2012 put the head on and do a squish test. Quote Link to comment Share on other sites More sharing options...
banshee760 Posted November 20, 2012 Report Share Posted November 20, 2012 What these guys are saying is what u need , u have a custom made pistons w a blaster cut done angle that's why u need to run the head that was given , I would just make Shure by checking the squish cause maybe u need a thicker bottom gasket and not so much a spacer plate or if everything is fine in dandy then u will just run that head the way it is with no head gasket just cilicone and torque to spec and UR good Quote Link to comment Share on other sites More sharing options...
Okiepred Posted November 20, 2012 Author Report Share Posted November 20, 2012 I bolted everything up with gaskets and the head for it and pistons hit the head! Cometic makes a 4mil kit instead of plate it's a thicker base gasket! I think with that I would clear and then do a squish test? Quote Link to comment Share on other sites More sharing options...
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