Typically the balance shafts used on 4 cylinders are driven at twice crankshaft speed. On a 4 cylinder there is always one piston going up to balance one piston going down. This is called primary balance and is used to reduce the loads on the main bearings. In addition it makes for less vibration and shaking externally. The balance shaft is to balance/reduce what are called secondary forces. These forces are the result of the pistons (the one going up versus the one going down) reaching their maximum velocity at different rotational positions. The balance shaft reduces external vibration but does not reduce bearing loads and can generally be removed. I have removed them on motorcycle engines before for less drag and a small increase in HP. If you remove the shaft take note of any oil passages which may need to be plugged.
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Today's Featured Article - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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