Longterm effects of 4k rpm?

['strokeThis_'07]

Was driving today and got to wondering. Really what would the longterm effects of running 4k be on the engine? Ive never really seen this asked before, so before I get springs and the new race Smarty, Id like to know the toll that its going to have on things. As much as these cost, I really would prefer to avoid engine damage. Its not a race truck, but I will probably take it to tracks, although it'll be wearing 37s. I still want the performance (600-700 fuel, possibly mid 12s), but the trucks a daily driver and will see off-road use also. Any opinions, experiences, etc appreciated. Thanks.

 

[catdsl]

i cant say for sure but i dont imagine it would be very good for the engine. they just were not desined for 3000 plus rpm let alone 4000

 

[RMalone]

I think it would depend on how often/long the engine would be running at 4k rpm. I think it is the same for extreme hp engines, if you use the power constantly engine life will diminish, if you use the power sparingly engine life should be longer. I have heard (don't know if it is true), that total fuel used is a better indicator of engine life than total hours.

 

[Andy Morrison]

I think at 4K RPM you might just wrap a rod around the crank

 

[Bob Wagner]

The 4K software WILL NOT be a general software release to the public.



Supporting modifications will be mandatory

 

[Gus's 03]

i look at it this way.



every eng has a given # of what i refer to as hp/hrs so it might las 1mill mies loafing at no load, or 10k if ya runn it at peek output non stop...



4k rpm? the botom end shuld take it... valvetrain tho... well... .

 

[BSwope]

Bob i know we will have to have springs but is a turbo gonna be one of the must have's?



Thanks

Buddy

 

[betterthanstock]

I used to hear rumors of the crankshaft vibrating itself apart around 4000, so that's why some 12v go quickly to 5000.

I don't know about how good a job the stock harmonic balancer (damper) does, but a fluid damper should be alot better.

 

[Motorhead]

An old stocker 12valve was governed at 2400 to 2600rpm. If you can build your power at lower rpms why rev it. I can't imagine 4k with the size of the rods our engines have. Alot of mass!

 

[JWesthoven]

The 4K software WILL NOT be a general software release to the public.



Supporting modifications will be mandatory

what do you mean by this bob?? if they're mandatory looks like im going to be getting the upgrades!! anything besides valve springs?

 

[Forrest Nearing]

us 12v guys have been turning 4k+ for years... the 3rd gen engines are even stronger than the older engines.



LOL @ the engine falling apart at 4k

 

[Forrest Nearing]

An old stocker 12valve was governed at 2400 to 2600rpm. If you can build your power at lower rpms why rev it. I can't imagine 4k with the size of the rods our engines have. Alot of mass!

because making power at low RPM = INSANE torque...



horsepower doesn't break stuff... TORQUE DOES!

 

[JBeasley]

I was wondering about the long term affects of sled pulling at 4k. I can't wait to get the smarty race tune because more rpm's is the only way the 3rd. gens. are going to be competetive with the 12v's and duramax's. RPM's = GROUND SPEED. I've pulled against guys with 100hp. less than me but because they can turn 1000+ rpm more than me they have more momentum and speed built up at the end of the track and they are going to go farther even with less hp. Granted you have to have enough power to leave with the sled in a high gear and keep it going without snuffing the turbo but the 3rd. gens. are getting killed in a 4500 rpm limit class. I'm going to start pulling with the race tune as soon as it's available but not before I put springs and a fluid damper on it. I hope I,m not pulling out a blowed up motor in 6 months.

 

[Forrest Nearing]

people pulled for YEARS before Fluidamper came out w/ their 5. 9 balancers... I wouldn't worry about it