Quote:
Originally Posted by johnneilson
Jim is correct, a 4 banger cannot be fully balanced because the offset piston acceleration.
You can equalize everything as much as possible, but never truly balance the motor.
Counterbalance the crank as much as you can, BB cranks work great, minimize the rod weight and the pistons too.
Banger motors making real HP will shake, that is a fact, a power stroke every 180 degs on the crank is why. Had a guy tell me he didn't like his motor shaking, I took the timing out and it settled down, then made no power. Guess what the final result was?
John
|
You are absolutely correct. "Fully" is interpreted two different ways here.
It is NOT the best word to use.
You can not get enough weight on the crank to 100% balance it. There is not enough room in the crankcase. Balance shafts are another way to 100% balance. Either way, a complete re-design of the engine would be required.