[Jay S]

There was a question earlier on why you would want a better harmonic balancer than stock if you have light weight internals.

It has been a really long time since I have studied or calculated anything like this, so I am for certain rusty on this topic, but for designing to control harmonic frequencies, I recall starting at the lowest design frequency, then looking at forces during those frequencies in orders, 1st order is where they would start, then 2nd, 3rd..ect. Each order is a multiplication off of the initial starting frequency. With less weight on the rotating assembly you are spreading the orders further apart. If the initial starting place was 700 RPM with stock internals and a stock dampener, it would go 1400, 2100 ,ect. So every 700 rpm. With the light weight internals the stock dampener might move the starting point to 900 RPM. So now it is 900,1800, 2700 ect. It would work the same way with a heavier balancers and stock internals, but from the other side of the equation.

The problem though with the stock balancer is I don’t think you can make the internals light enough to spread the order’s out for many more RPMs. The 2 piece dampeners are supposedly good for about a 3000 RPM range. You could maybe get another 600 RPM’s out of it because the orders are spread out using the lighter weight rotating assembly. But it needs a dampener like a ATI that has a wider operating range combined with the lighter rotating assembly to gain on it much on controlling the harmonics. Plus those harmonics are getting amplified a lot also from more power and more RPM’s.