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Engine Mechanical TopicsDiscussion for motor builds, cams, head work, stripped bolts and other engine related issues. The good and the bad. If it goes round and around or up and down, post it here.
It been kind a slow on the work for the DX, Had other projects plus the weather has been good. I have all the parts except I need to make cylinder dowel pins.. The part of the project I've been stewing over was correcting the balance on the crank. The Wiseco pistons, rings, pins and clips weight 1080 grams for the pair and Stock 88 ci pistons, rings, pins and clips weight 1200 grams. Need to account for the 120 gram difference. I calculated the balance factor for 1200 grams and checked the balance. The wheel balanced right at 52% with the correct weigh added. Early TC cranks had the halves of the crank balanced separately, You can tell by observing that the drill holes were in different locations on the different sides. Since I don't want to disassemble the crank, the way to balance it was to remove the same amount of material from both sides and at the area opposite the crank pin.
Was able to deepen 3 holes on one side and add one more. Other side got 4 holes. I worked up a spread sheet of the balance weights and calculated roughly how much material needed to be removed. You can see by the bottom pic that my balance was off by 2 nuts..
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