420A 7100 rpms

[Jonnychance]

I barely went over the rev limiter to abt 7100-7200 is my okay it's just drives perfectly fine

 

[o0GuitarKid0o]

If its stock keep it below the rev limit but if you have aftermarket valve springs and built motor to handle more rpm than giver .

The Thing you gott be careful with is valve float
Research it

 

[BLACK'98DSM]

Don't worry if it drives fine but never ever do that again.
Unless you want broken stuff

 

[rabenne]

You hit the limiter? Or went over it?

 

[AWD-Tony]

You have 24 hours of driving left before she blows up. It's now a ticking time bomb. j/k

 

[curt-s]

It is hard to answer that question because, while a new motor could do 7000rpm (provided it was capable of that), the same motor 10 years later might let go. too many variables, parts, age..
hell even the exact same two parts new can vary -- one handles something, the other not so much.

generally, if you have revved too high, it does not take too long to show itself. but, at the same time, perhaps the high oil pressure induced by the high rpm dislodged something which is now reducing flow to a bearing surface.. and that ticking time bomb analogy becomes more friction than fiction (teehee).

only time will tell. keep an ear out for strange noises.

 

[Canadian_CD9A]

I bounce my engine off the 7500 RPM limiter all the time in autocross, so I highly doubt any damage was done; the limit would be lower if there was a risk at that RPM. Stock valve train (with stock cams) will go 8,000 or more, but the connecting rod bolts probably aren't safe past 8,000.

 

[Jonnychance]

Okay thanks guys yeah I drive the completely stock 420a motor and it sees 5000 to 6000 rpms daily shld I install new valve components or other parts?

 

[ThunderChild]

Okay thanks guys yeah I drive the completely stock 420a motor and it sees 5000 to 6000 rpms daily shld I install new valve components or other parts?

My vote is keep it stock and don't thrash it too hard unless you want to rebuild/fully build sooner or have a second car.

420a's in stock form are nice little driver's if maintained well and not wrung for everything they're worth, but past that you start noticing shortcomings relatively quick.

 

[Canadian_CD9A]

Oh, 420A. Don't do reliability mods, it's cheaper to just throw a junkyard engine in if yours blows up.