Newbie engine rebuild questions.
Evolved Member
Joined: Aug 2014
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From: Australia
This topic has been discussed to death so not to prolong that, but it's pretty universally accepted that removing the balance shafts will increase vibrations, so the argument of the balance shafts needing to go because of non-stock block is not accurate. Keeping in the balance shaft definitely reduces vibrations/engine harmonics, even if it's not specifically tuned for whatever aftermarket bottom end someone is using.
This topic has been discussed to death so not to prolong that, but it's pretty universally accepted that removing the balance shafts will increase vibrations, so the argument of the balance shafts needing to go because of non-stock block is not accurate. Keeping in the balance shaft definitely reduces vibrations/engine harmonics, even if it's not specifically tuned for whatever aftermarket bottom end someone is using.
Stock rotating assembly generates X frequency 2nd order harmonic vibration. The balance shafts are tuned to create the exact inverse of this frequency to cancel it out from being felt. If it is not the exact inverse no cancellation happens, but a new combined vibration occurs. This is simple physics.
So if I put my hand on my engine while it was running, and then took my balance shafts out and put my hand on the engine again while it was running without the balance shafts, I wouldn't feel any more vibration in my hand?
Thats not a relevant test. You don't understand the physics at play here, thats ok. But stop repeating bad information.
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