banshee topend

[Okiepred]

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

[n2otoofast4u]

Id use long rod piston before a space plate!

 

[Okiepred]

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

[Starwriter]

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

[n2otoofast4u]

uhhh. Yeah you need to investigate a little more. Whats the number thats on the pistons you have now?

[Okiepred]

The number on the piston is 8963! 70.45mm it sticks up maybe an 1/8" if that

[Starwriter]

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.

[AKheathen]

if you have the wrong pistons, the rings would pop out of the top, iirc.

[Okiepred]

 

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[Okiepred]

The rings does not pop out! The pic above is at tdc

 

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[n2otoofast4u]

did you get domes for this setup?

[Okiepred]

I have a stock cut head that was being ran with this setup! It was being ran on a 4mil!

[n2otoofast4u]

put the head on and do a squish test.

[banshee760]

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

[Okiepred]

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?