Thread: Balancing and engine........needed???

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yep it some what like don said the big and small end of the rods get match going from the lightest rod . same thing with pistons .if the crank can support the mass then it gets drilled or smooth sanded away counter weight or cut on a lathe this keeps deep holes out of the crank better oil control. when the mass is more then the crank counter weigths can support then heavy metal slugs get press in the crank counter weigth . there many ways to work the parts you have to get them the same weigth on each crank throw . your dealing with many parts some time if the rod on small end (pin end) is to light then the rest of the rods .then you find one or two new rods that match up to old rods if you do not have other rods on stock stuff you may have to get very creative as they can be waayyyyy off .or you can sand numbers off and move rods a round if pistons are stamp to each hole were the piston s may have a bit more weight and could go with lighter rods or they may just moved the weight of the lightest rod to a heavy rod on the same rod journal as the crank only see s mass weight not each part . internal cranks you can spin the damper and fly wheel even if neutral bal crank .with external bal engines you need the damper /hub and fly wheel is when crank was made it could not support the mass so part of weight hangs out side of the crank . and some OEM engines are 1/2and 1/2 were the front of crank is neutral and back is external this happens alot one pc rear main seal engines is with that crank hub you can not hang off the back of the crank is what i call a heel all that is a chunk of steel hanging off the back of the crank seen on many two pc cranks. on race cranks we move things around and try to keep all weight inside of the engine that were we will use heavy metal and slug up the crank or find a crank with more counter weight