Originally Posted by
silvia1320 it was around 8200 or so. i think the rev limit on the tune is 8250. i got to tearing it down a little tonight and i pulled the header off and there was oil in cylinders 1-3, but 4 was clean. That would explain all but 1 of the plugs being f-ed up. i'm going to hopefully drop the motor out by friday, and ill pull the head and see the chaos that im sure is inside. i thought that i would be good at 8k but i guess not. I guess this is an excuse to rebuild it bigger and better.
Stock cams and stock valve train is a no no past 7900 RPMs. This is even more so if you happen to hit the rev limiter hard. If you hit the rev limiter hard the chain will snam back just a hair. This will cause the valves to hit the pistons, please remeber that the valves themselves were already floating just a bit and the action of hitting the rev limiter made this worse.
By the way guys N1 cams and stock SR20VE valve train and 8500 RPMs seems to hold up just fine. I have to guys down here that are on stcok valve train and N1 cams and these gusy find themselves up at 8000-8500 RPMs all the time.
The N1 cams have a very smooth open and closing because of their long duration and %of lift to duration. N1 springs are actually softer than stock SR20VE springs.