What’s the ultimate power vs weight car, well putting a EJ25, 2.5 Ltr turbo boxer engine from a WRX into a 1961 Morris Mini might be it. Check out our customer’s build and see why replacing a flywheel is better than machining.
When a new clutch kit is installed the flywheel is much better to be replaced. This is because excessive heat from normal driving changes the structure of your flywheel surface which creates less friction affecting the performance of your clutch. By replacing or machining your flywheel the surface of the flywheel reinstated back to the original equipment friction characteristic.
There are three main technical reasons to replace a conventional flywheel instead of grinding:
1. Issues caused by a bad grind. There are various issues that can come out of a poor grind, these includes;
Flywheel surface being too smooth which can cause shutter or slipping.
Incorrect flywheel step or recess ground; in the case where a flywheel is not flat the recess or step must be maintained. Failure to do this can cause engagement or disengagement issues.
2. Risk of catastrophic failure; in situations where the flywheel is placed under extreme heat damage can occur to the steel microstructure weakening the flywheel which can lead to cracking or destruction of the flywheel.
3. Decreasing the overall stack height. Modern actuation systems have limited bearing height adjustment so after 2-3 grinds the overall stack height of the clutch system can be reduced enough to cause disengagement issues.
