Over-Revved, Am I gonna be ok ?????

Mitco39

Threads like this are comical. We have guys who probably have never lifted their hoods commenting in here. Some of the posts really show that.

There is one big difference that Mt Tam I Am sort of mentioned. There is a huge difference between over revving under load and over revving under no load. The loadings on the engine are completely different. I would not be worried about over revving for a quick duration, if the engine didn't drop a valve or break the oil pump your fine.

Longer than a just a quick blip of the rpms and I would be worried about the engine moving towards dangerous harmonics than anything else. Its those harmonics that would absolutely kill an engine (again the harmonics under load are going to be different than a quick overrev). I would consider the biggest limitation (aside from harmonics) to setting a redline for a particular engine is in the heads, more specifically the valves.

Think of it this way, unless an engine is blueprinted and truely balanced (and we all know that nothing is perfect) its like taking your very very slightly out of balance tire and accelerating with it. You can easily feel when the tire starts to vibrate the whole car, then as you go faster you may notice it go away, but there becomes a point when its going to get much worse as you start to move towards its natural frequency. The same thing will happen (and does happen) in your engine.


Anyways, sorry for the bit of a rant. I promise you your engine will be perfectly fine. If you were going to do damage you would have known right then and there when you dropped a valve.

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Chuck33079

Yep. If you overrevved it enough to cause piston to valve contact, you wouldn't need to ask anyone. You would know with 100% certainty because the car made a very expensive noise and you felt a sympathy pain in your wallet.

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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

Girald

Ive money shifted twice (*ouch and ouch) Once on the freeway to damn near 9k in gear and another just over 8 at the track, with clutch out...

Not proud of it since it always feels like how you feel when you see someone get kicked in the balls..

That said, ive had compression and blow by checks to gauge health just before a TT install coming up. All looks good, car sounds strong, and mag oil plug looks typical. I have to say, these cars take abuse, but im not trying to repeat it....

BUT: I do know now that the non-nismo oil pumps are sht, and my future at the track could kill the car if i dont upgrade to a new billet oil pump gear, or simply switch to a nismo oil pump. And - i might have done damage to the pump that might reveal itself after boosting and tracking the car...

I did add an oil pressure gauge, something my OCD enjoys to stress about. So, I can catch a failure in time hopefully,,, but 99.999% I will swap to the new billet pump when they drop my motor for the turbo install.

ALL OF THAT SAID: if the car can hang with me for 2 years boosted, ill be sending it off to AAM for a forged block and 750WHP no shts given

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AAM tt'ed // Soon: Moving back to the East Coast