After my last race I started to see very small bits of copper in the oil filter (changed filter twice and found it both times after brief startup and run-up). I change oil/filter after each race so it was caught early. Motor never ran rough, smoked, or sounded abnormal. Hot/cold oil pressure was normal, nothing out of the ordinary.
I pulled the motor. Found only a few small bits of copper in the bottom of the pan sump. I pulled the lower rod and main bearing caps and the bottom half of each bearing looks perfect. Bottom side of main and rod journals look perfect (no blueing, no cracks, no scratches). Rotating assembly was balanced with ATS billet flexplate and ATI damper. Block has billet main caps and girdle. Did not check crank endplay before pulling the caps but the way everything looks it will still be in tolerance.
Turbo is still new ball bearing and the heads are still in great shape (no guide wear, rocker shafts are all good, lifters look new, and pushrods are straight). Piston tops are good.
About the only thing left could be a cam bearing or wrist pin bushing. Have yet to pull the cam or remove the rods/pistons.
Motor was turned over 4400rpm regularly being raced. EGTs were typically 1700deg at the top end of the track and I run a small nitrous solenoid at times at WOT.
Any other thoughts on what else to check?
I pulled the motor. Found only a few small bits of copper in the bottom of the pan sump. I pulled the lower rod and main bearing caps and the bottom half of each bearing looks perfect. Bottom side of main and rod journals look perfect (no blueing, no cracks, no scratches). Rotating assembly was balanced with ATS billet flexplate and ATI damper. Block has billet main caps and girdle. Did not check crank endplay before pulling the caps but the way everything looks it will still be in tolerance.
Turbo is still new ball bearing and the heads are still in great shape (no guide wear, rocker shafts are all good, lifters look new, and pushrods are straight). Piston tops are good.
About the only thing left could be a cam bearing or wrist pin bushing. Have yet to pull the cam or remove the rods/pistons.
Motor was turned over 4400rpm regularly being raced. EGTs were typically 1700deg at the top end of the track and I run a small nitrous solenoid at times at WOT.
Any other thoughts on what else to check?
