We only drill or grind a small amount from the OD of the journals. We some, but not all, we also add a counterweight to the timing gear to balance the front.SchmidtMotorWorks wrote: ↑Fri Jul 20, 2018 1:04 pmThat could happen from any change in mass to the shaft.CamKing wrote: ↑Fri Jul 20, 2018 11:42 amOn the spintron, we see a reduction of valve loft and seat bounce, at high rpm's.SchmidtMotorWorks wrote: ↑Fri Jul 20, 2018 10:33 am
In what measurement is stability improved? Rotational velocity?
On some rare occasions, we've had to add heavy metal to the journals.
In all these different cases, the valvetrain stability was improved.
Removing mass to the journals, adding mass to the journals, adding a counterweight in front of the timing gear.
All helped, and the only constant is that each cam was balanced.