Speaking with my machinist last night...who is 500 miles away in NY. He told me I needed to measure my deck height and also know the CC size of the reliefs in my pistons.
Wondering...if you don't know the make and model of the pistons, what is the approach used to measure the reliefs? I remember reading about CC'ing the combustion chambers on heads using an old CD case and brake fluid or something...
Do you figure the same approach would work for determining the volume of the reliefs in the pistons?
You could use a piece of clear plastic with a hole in it over the valve relief. Seal it to the piston with light coat of vasaline. Then use w-wiper fluid and a graduated eye dropper. If the reliefs are the same size. Measure one and multiply by the number of reliefs.
I'm not a physics major...heck, I never even took a physics class, but will the clay displace the water correctly?
Like, if I were to pack the reliefs with sand (just theoretically) then I put that sand into the water, would it displace an equal amount of water as the clay?
I'm not a physics major...heck, I never even took a physics class, but will the clay displace the water correctly?
Like, if I were to pack the reliefs with sand (just theoretically) then I put that sand into the water, would it displace an equal amount of water as the clay?
The clay is a solid and will not absorb any of the water.
One could also check with the piston maker. Piston head volume is a common spec supplied by them. Most pistons with valve reliefs that accomodate 2.02/1.60 valves will have a volume of approx -6 cc.
Being that I didn't put this motor together, I'm not sure of the piston manufacturer.
I *think* they may be aftermarket because there is a ".030" stamped into the pistons...not sure if this is common for GM parts or not...I wouldn't think so.
So...is there generally markings to be found on the piston that MIGHT tell me who the manufacturer is or what the part number is? or is this left to calling Miss Cleo?
If there are markings, would they be viewable with the shortblock together? maybe if I rotated the assembly to BDC and grabbed a flashlight?
The bottom inside of the piston sometimes has the mfg & part #.
My old engine had TRW pistons that had the # on the top along with the ".030".
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