Built 2.4L gone bad at 300 miles?

[eclipsegsxccca]

You need to seriously learn how to "break a motor in fast". It's not 140 mph runs, it's short full throttle runs to 60-70 mph after it warms up and then letting it completely cool off between runs. Going 140mph is hard on a new motor in more ways than you will ever understand. Especially with stock fuel system, most people wouldn't even attempt to start there 2.4l with a stock 2.0l fuel system. If you like it or not the 140mph run did start doing some damage to your motor. Then turning down the fuel pressure on a already insufficient fuel system and trying to go over 100mph again is just nuts.

..... I know that I did not go 140 right away. only after it had good compression

 

[2-0turbo]

I got a g4cs 2.4,and i would have never went 140 top speed run.I can say i went racing at 300 miles on them motor,but no prolonged speeds.You got a 2.4 and ran stock injectors was your first problem,and you detonated,running 6es,probably too much timing,not enough fuel and you melted some shit.Im over 1000 miles into my motor,and have been racing it since 300 miles no problems.But i also have injectors,and know how to get a car setup "safe" to beat on.Im sure the machine shop or noone messed up,and you just threw away 3k

I agree with the others that tuning is the issue here, not romping on the car. I prescribe to the Mototune method of breakin and that is exactly what I did to my new 6-bolt this past weekend. I had 150 road miles on my car and took it to the roadcourse this weekend. The 150 roadmiles I used to confirm my tuning that I was not knocking and running safe AFRs. 250 track miles later with top speeds to about 120, and she is running like a top. Remember, on break-in, all you are breaking-in is the rings. High cylinder pressures are key to getting the rings to seat against the hone marks on the cylinder walls. I have about 700 miles on my engine now and is is running great. I've burned about 1 quart of oil so far and expect that to diminish as time goes on. In addition, if I'm going to have problems with my engine, I would rather know it sooner than later. See my gallery of shots from VIR here. Take it easy.