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broke off the flywheel.

Subject: broke off the flywheel.
by Nissan4Eva on 2016/8/27 22:53:45

Broke off two flywheels in 4 days. 1st one was with standard bolts. 2nd was with ARP bolts and steel dowel.

Both happened while launching at 5500rpm revving to 8000rpm every change to third where disaster happens.

Cars runs 4.8:1 diff, sticky 195/50/15 tyres. Its an A15, ported head, twin webers, electromotive 300 degree 12.3 camshaft.

Flywheels were supposedly balanced,lightened cast items.

What am I doing wrong?