Quote:
Originally Posted by 20valvewynn83
Really come on now! The only way a crank pulley can be balanced is if they do it on the engine and I will tell you this "they don't". Also everyone is so concerned about vibration, what do you think the hydraulic belt tensioner is for. When we replace a crank pulley its not balance to every engine.
|
I assure you I have a lot of experience in balanced crank pulleys and they need to be balance and checked to over the max rpm that the engine is expected to rotate. It does not need to be balanced on the actual crank assembled in the engine. How do you think cranks get balanced? In the engine with the rods and crank pulley on it? No. To balance a crank pulley is the same way. They mount it on a machine and spin it and balance as needed. Many oem crank pulleys have little round spots on the face that has been drilled into them. This is where they drill to remove material to balance the pulley. You see this more on pulleys that are dampened then a solid cast pulley from the factory. If the aftermarket companies that make the pulleys don't make sure they are balanced in quality control before it is finished then they aren't doing their job. I assume they do but you would have to ask whoever you are buying one from.
I have built many cars that require modifications to the crank pulley to fit in an engine bay like removing an un-needed section like for A/C. We send the crank pulley to the machine shop and they mill off the section that is not needed and we make sure they balance it as well just like balancing a crank.