QUOTE(bulitt @ Dec 11 2013, 06:29 AM)
QUOTE(OU8AVW @ Dec 10 2013, 08:53 PM)
My machinist buddy and I made a custom lexan disk to mate to my heads. My wife is a nurse so she got me a 30ml syringe from work. Time to CC my heads and figure out my compression ratio. They came to 62.5cc. With that and a deck of .045 that's about 9.17:1. Seems a bit high?
Do these motors use head gaskets?
So....
I entered my numbers in inches into a metric calculator and got bad results on my CR. Looks like 8.26:1 this time. Now it seams low but my deck height will be set at .045" which I think is about a low as you can go?
My next step is to get the custom spacers to set my deck, then I can install the heads. I think the thing to do will be to make an adjustable pushrod and use it to set the geometry. I have machinist friends who can help make this. I'll pass it along if timing works out. I have Cro-mo pushrods so I can set the lifters to zero lash. I'm not used to this as I've usually dealt with Type 1 motors and stock Hydraulic lifter Type 4s.
If .045" is around the minimal deck height and I can achieve this then my CR will be 8.26:1. Kind of low but then again I might be a little off on my measurements. I made a tool that helps measure this. One issue I had was that my pistons went .01" prod of the cylinder when I first installed it. This means that I will need the custom shims or use a head gasket. Not sure what I'll do next. It usually takes about a week to sort all the info/opinions before I make a decision. That clock started last night