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stugray |
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#1
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Advanced Member ![]() ![]() ![]() ![]() Group: Members Posts: 3,825 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None ![]() |
Ok, so I bought the deck height measurement tools from the group buy.
But I cannot figure out exactly how the OP intended to use the middle plate. I have been trying to measure my deck height accurately for weeks now and I either am not doing it right, or I have a problem. I have the EMW AA cylinders & KB Hypereutectic pistons - brand new. I am measuring with no shims under the cyls. I bolt the holddown tool on two cyls with pistons installed and torque to spec (24 ft-lbs) I set TDC on the cyl I am about to measure with a mag base & dial indicator using the middle of the piston as reference. I then set a VERY straight edge across both cylinders and clamp it down. I then measure the top of the cylinder mating surface down to the very edge of the piston using a dial indicator/depth gauge. I repeat the measurement at least 5 times and average the results. I am getting measurements that vary from .022 to .032 and they can vary by up to .0067 across a single piston (front to rear). (IMG:style_emoticons/default/WTF.gif) (measurements at the same spot are repeateable within less than .001) When we are trying to get these deck heights to match to within a few thousandths, I cannot see how that can be done when the piston can be off by more than 5 thousandths front to rear. Does this mean I have bent rods or misaligned wrist pin bushings? I had the entire rotating assembly balanced, so I would hope they would have caught something bent. I guess my next steps will be to shuffle the pistons around and see if the measurements follow the pistons. If they dont, I might need to move rods. Can all 4 rods be removed & replaced without splitting the case again? Stu |
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jmalone |
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#2
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Member ![]() ![]() Group: Members Posts: 119 Joined: 3-July 09 From: reno,NV Member No.: 10,529 Region Association: Northern California ![]() ![]() |
Have you measured from the top of the problem piston to the top of the wrist pin bore on each side of the problem piston. Also you can measure the cylynder on each side from the bottom where it seats on the register to the top sealing surface where it seats in the head parallel to the wirst pin . Those measurements should be easy to do and at least you will learn if you have an out of spec cylinder or a piston with a mis-aligned wrist pin bore.
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