Joined
·
250 Posts
Well I bought a vito's monoblock that has been drag ported, I was told it was on a 4 mill running a spacer plate with stock length rods. Problem is when I installed it on my stock rod 4 mill motor with a spacer plate the pistons were way below deck height so after some measurement I decided to make a .045 spacer plate which put my pistons at 0 deck height I then checked the squish and had .046. So far so good them I put my 9 inch degree wheel on and checked the port timing. With this setup the piston was passing down slightly past the transfer windows
Outer exhaust ports 200*
main exhaust 198*
main transfers 134*
boost intake transfer138*
I didn't think this was right so I took the .045 spacer out and checked them again leaving both of the .020 base gaskets in. I now have the pistons sticking out of the cylinder .045. Now the piston doesn't quite make it to the bottom of the transfer windows.
Outer exhaust ports 196*
main exhaust port194*
main transfers 126*
boost intake transfer 130*
This whole thing didn't make sense so I did some reserch on the pistons and found out that they are a vito's piston that from my understanding have been cut on top to increase port timing on motors with stockish port timing. So should I add a.020 shim to my base stackup from the second setup above and then cut the dome to get the squish right? Are these vito's pistons supposed to have some crazy amount of squish? I know I should just buy a new set of wiseco's but I am running out of time and cash.
Outer exhaust ports 200*
main exhaust 198*
main transfers 134*
boost intake transfer138*
I didn't think this was right so I took the .045 spacer out and checked them again leaving both of the .020 base gaskets in. I now have the pistons sticking out of the cylinder .045. Now the piston doesn't quite make it to the bottom of the transfer windows.
Outer exhaust ports 196*
main exhaust port194*
main transfers 126*
boost intake transfer 130*
This whole thing didn't make sense so I did some reserch on the pistons and found out that they are a vito's piston that from my understanding have been cut on top to increase port timing on motors with stockish port timing. So should I add a.020 shim to my base stackup from the second setup above and then cut the dome to get the squish right? Are these vito's pistons supposed to have some crazy amount of squish? I know I should just buy a new set of wiseco's but I am running out of time and cash.
Attachments
-
337.3 KB Views: 4,071
-
450.9 KB Views: 4,902