Quote:
Originally Posted by carl hinkson
Being 2 grams which on my balance card would put you 4 grams over balance is not going to hurt a thing.
If you have the crank rebalanced onece its done and the bobo weights are removed have the machinist put the bob weights back on and see how close it is!!!
Like guys guess the oil weight how do they really know what to add for the weight of the oil ???
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Carl is correct. Crankshaft balancing is governed by the world wide standard of ISO1940 and if you plug in all the figures and do calculations based on a 1700 gram bob eight and 8000 rpm, the residual unbalance of -4 grams is under balanced (remember you are removing 2 grams per rod). The residual unbalance change is minuscule. The weight change is only .002 %. And as Carl said, remove the bob weight and re install and get your big surprise. You will be appalled at how many shops that do not re calibrate their machines on a timely basis. Many dont even center the bob weights on the rod journal except by visual and the same in placing the bobweight perpendicular to the rod throw. And get real surprised when you tell them you want to over balance the crank since you are going to drag race it. And even more so when the "machinist" over balances a circle track motor because it works on a drag car.
Do not worry about re balancing unless that is what you want to do
reed