will do, I'll have my mechanic take a look at em, unless there is an easy way to measure them then I'll do it....
Measuring the actuall compression ratio achieved is a bit tricky. You need to be able to measure or calculate actual combustion chamber volume at TDC, and total cylinder + combustion chamber volume at BDC.
The most accurate way is the "beaker test". The high level overview is that we use a calibrated beaker full of liquid to first accurately measure combustion chamber volume with the piston at TDC, then drop the piston to BDC and measure the resultant combustion chamber volume + cylinder volume.
I use a little valve with a hose on it that I made that screws into the spark plug hole to control the flow of liquid into the chamber. The hose goes to a beaker with an outlet on the bottom of it, like an IV drip or something. I used the mondo turkey baster from hell for mine.
To do this, we need to assemble one cylinder, piston, and head to the motor. Leave the cam out of the head, but it needs the valves. Put some heavy grease on the rings so they seal the liquid that you will be filling things up with. I use ATF, but any oil will do.
The next part is easiest if the motor can be positioned with the spark plug hole up. Screw the valve into the spark plug hole, connect the hose, and hang the beaker. Fill the beaker enough that there is enough liquid to fill the whole cylinder, and then some. Write down the fluid level. With the piston at TDC, crack the valve and let it fill up. When it quits bubbling, and the fluid in the beaker settles to its new, lower level, the difference is your actual chamber volume. Write this down. The difference between the two measurements is the chamber volume.
From there, rotate the piston to BDC with the valve open, allowing the cylinder to fill. Take note of the volume of remaining fluid in the beaker. The difference between this lowest volume and the original
volume in the beaker, the first number you wrote down before you filled the combustion chamber at TDC, is the combined volume. Write this down. A lot of guys get confused here, and use the difference from the second measured volume (after
filling the chamber) - this is a mistake. This is the displacement, which we already know.
Combined volume / chamber volume = CR. And now you have one hell of a mess to clean up. It's easiest if the motor is on a stand that allows it to be rotated so the spark plug hole is down.