Input (grade 13): More modern 90 Â V6 engine designs avoid these vibration problems by using crankshafts with offset split crankpins to make the firing intervals even, and often add balancing shafts to eliminate the other vibration problems.
Output (grade 9): More modern 90 Â V6 engine designs avoid vibration problems by changing the crankshafts design and firing timing. Balancing shafts are often used to remove the remaining vibration.