Originally Posted By: mjoekingz28
Ok, I just viewed a really insightful video. As stated there is static and dynamic. One makes sure the tire is balanced in round and the other side to side. I did not know this.
I thought it was neat that his balancer could tell him to place the weight on the inner or outer flange of the wheel. I did not know the machine accounted for inner/outer type imbalances and I cannot really perceive how it can make a difference on the car the way a circular/rotational imbalance can.
But none the less, thanks !!!
For dynamic imbalance, imagine you are driving along very slowly, every time one point of the tire is at the front of the car, somebody gives the sidewall a kick, then every time that same spot is towards the back of the car, somebody kicked it from the inside. Now imagine this happening every time the tire rotates at 500 RPM. That is a tire out of dynamic balance.
It actually gets a lot more complicated than just static and dynamic imbalance, there are also second and third harmonics of the primary balance of both, plus the roadforce. If you have two wheel weights on the outside of the rim across from each other, it may be eliminating the primary static balance, but it will increase the second harmonic of the static balance. The different harmonics act just like the primary balances, but at higher speeds, and not as strong.
When we have a vibration issue these days, we often have to go in an try and minimise the second harmonics to solve it. New Hunter machines that we use have this capability. Real PITA though.