Mechanical over-revving

[Adam]

I just picked up another range 2 mechanical over rev yesturday. The engine seems to run fine still but I was just curious if type of abuse leads to problems down the road? Is this something I should be concerned about or do I just worry too much? Will this increase the liklihood of premature engine failure? Will I be covered by warranty if/when the engine finally lets go?

[wetsuff]

Adam: Tool Pants would know better, but I asked my dealer to see if the prior owner to my 01-S had any. He laughed and said the valve stems would have been bent and I wouldn't have gotten this far...

That's an obvious overstatement but I was happy to hear that the computer showed none on this engine none the less. Run a search on 'Level 2' - I'm pretty sure there's a posting on it.

I think I'd have to give the kid in myself a timeout.

Jim

[Adam]

If the valve stems were bent I would definately know that right!?? I remember the thread you are referring to and Tool Pants showed a OBII scan of one of his friends boxster S's that had 9 range twos. He said the guy was on his 2nd engine, but I couldn't tell if he was joking or not or if it was due to the over-revving. There wasn't much techical info in that thread either. No one seems to know much about this subject. There is a video of a guy with an Acura RSX doing a 3-2 shift at redline(like I did) on the net and his was engine finished. I guess the pistons slammed into the valves? If my motor doesn't seem to have any apparent damage do you guys think I'm in the clear??

[Brucelee]

If you overrev to the point of valve float, you literally have the stems of the valves bouncing off the cam and such.

Hmmm, how could this be anything but bad for your box? I THINK that is why they have that whole red line thing?

[Adam]

Well, I know it's definately not good but I took my car out today and it runs stronger than ever. I know that it was definately an over rev(again) because I was at redline in 3rd at appox 100mph and I dropped it into 2nd! The back tires locked up and stutter skipped on the pavement and the engine went weeeeeeee. It sounded kinda like a super-bike for a sec now that I mention it. I guess these Flat 6 engines can handle quite a bit! If there was any damage I think it would be immediately apparent(bad noises and blinking lights etc etc). I think I dodged another bullet but I'm going to be more careful from now on and not try to be ultra quick shift speed racer boy. Thanks for the responses.

[Brucelee]

Damage is of course, a relative thing. Some damage is micro in nature and simply leads to issues down the road. Other damage is massive and immediate.

I am all for using the Box towards it strengths, as long as one knows that there is no cheating the laws of physics. You play, you pay!

But you seem to know that now and hey, who am I to talk???