SeaDoXPL,

The rev-limiter only stops you from over-reving the engine during acceleration. It will not prevent you from attempting to spin your engine to 12,000 rpm by accidentally downshifting to second when you meant to hit 4th, OR even just attempting to heel-toe into second without slowing a llittle first.

 

People think that since the tach does not register beyond 9000 that they never overrevved their car?

Several people in here actually believe the S2000 engine can not be mechanically overrevved.

When I see a thread that some lucky 19 year old kid just got their brand new S2000, I fugure that within a few months their next posting will be in the short block replacement thread.

 

Clark,

Interesting Point. I'm still pondering whether that makes sense.

It seems to me that if I downshifted the motor would rev less during the shift process then once the clutch engaged shoot right back up.

How would that be different from acceleration from a dead start except that it happens much more quickly . Its still acceleration and once the sensors see that you have hit 8900 it should fuel starve the motor or whatever it does. At least this is what happens with my car .

I don't willy nilly try to over rev but it has happened during races from a dead start .

On the occasion that I may miss the correct gear during a downshift I quickly withdraw from that gear before it revs too high.

I used to drive a 13 B Rotary equipped car so I am used to revving perhaps in excess .

 

The's the common misconception surrounding whether or not you can overrev an engine -- the difference is that when you are already going a certain vehicle speed that would equate to higher than redline in a certain gear.... and then you shift into THAT gear. Whether or not the fuel gets cut off because of the resulting high rpms does not matter -- the wheels will be turning the tranny and in turn will be cranking the engine at a speed that the engine is not designed for -- mechanical overrev is what you get. There's nothing a computer-controlled sensor can do about it because the clutch is grabbing so tightly onto the transmission which is spinning at a dangerous rate and thus it will turn the engine at a dangerous rate also.

The idea is to learn the max speed in each gear, and pay very close attention to this as you are downshifting into other gears.

 

[QUOTE]Originally posted by SteveUCI
[B]

The's the common misconception surrounding whether or not you can overrev an engine -- the difference is that when you are already going a certain vehicle speed that would equate to higher than redline in a certain gear.... and then you shift into THAT gear.

 

It's just a guess but I would think even downshifting resulting in instantenous 8000-9000 rpms is bordering on abuse.

 

I think sometimes we forget exactly how fast 9000 RPM's actually is. Totally amazing.

 

Rev limiters cut either the fuel or the ignition. If the rear wheels are driving the engine to xx,000 rpm, the computer can cut off the fuel or the ignition completely and the rear wheels will drive the crankshaft to that rpm.

Wake up, America! Do you think that the rev limiter is some kind of mystical, magical spring in the driveshaft that absorbs the extra rpm and releases them when it's safe?

 

Not if I'm doing my job properly. The short block replacement thread is for short block replacements not secondary to bent valves from over-revving. In almost every case, the head with the valves and cams from the original engine was reused.

It would be interesting to catalog the bent valve cases, but the short block replacement thread is not that catalog.

 

When I worked one summer for a Chevrolet dealership, I used to think all the Corvettes coming in for service were because the Corvette was simply a typically poorly built Chevy. Now, years later, I realize that high-performance cars attract a certain "idiot fringe" of owners that think their car is bullet-proof and can be pushed beyond normal mechanical expectations. I truly think this is often what is happening with our beloved S2000. Certain people, of a certain age group possibly, don't understand what abuse is when it comes to a car, and then wonder why their clutch goes up in smoke, drive-shaft breaks, or my favorite, "why doesn't my car rev over 6000 RPM when the engine is cold?". There's no question that Honda could have built certain parts of the car to be more durable, but you will always have drivers who will exceed the car's limits, no matter how durable it is. I think Honda is aware of this and treats suspicious warranty claims accordingly. This is unfortunate for the rest of us who might have a legitimate problem not caused by abuse.