| Re: Cam lobe damage - test my theory (long) |
Subject: Re: Cam lobe damage - test my theory (long) by rklessdriver on 2010/10/11 19:47:21 Your pre-ignition theory is not feasible as to damaging the cam. It will cause the bad performance. It looks to me like that cam is ground on a cast "Everwear" core. IMO this is 100% what caused your cam problems. The cast Everwear cores are JUNK and well known to fail, sometimes for no reason. I can also see the chatter marks from when the core was ground. That rough surface will cause the roller to skid across the lobe. Look to replace the cam/rod/main brgs because the metal from the failed cam will damage them. Take the oil pump apart and check the gears for debris damage. Std tension oil rings should take care of the oil consumption problems as long as the cyls are still straight. To minimize the chance of this happening again: 1. I would suggest you get your new cam ground on a billet core. The LS7 lifters your using are pretty good and should hold up fine. 2. Since you have a supercharger you must be very careful with your spring pressure. MORE is better. Too little will cause the valve to bounce on the closing ramp and eat up any cam. You can run up to 155lbs seat and 400lbs open spring pressure on a hyd roller. Will |
