11.000 rpm: what would you do...

[TwinTurboM3]

What would be on your list if you would like to rev 11.000 rpm?

Engine inline six cylinder

Stroke 91 mm

On the list items:
very strong valve springs capable of opening and closing valves @ 11.000 rpm.

carillo rods with carr bolts.

light weight pistons forged. with heavy duty piston pins.

titanium retainers

a good light weight tripple plates clutch kit.

all assembly balanced and blueprinted.

dry sump oil system.


What would you add to these?

[AdioSS]

why is the RPM capability so important? What are your power goals?

Getting enough air and fuel into the engine would be pretty high on my list.

I've noticed a guy on one of my local boards often talks like that. He comes from mostly 4banger import stuff, and he's getting an LS1 built for an RX7. He seems to care more about what his engine builder said the RPM range would be than how much power he'll make.

[CamKing]

That's an average piston velocity of 6,569-fpm.
I hope you're not planning on running it for more then a few seconds.

[PackardV8]

X3 on the questions/cautions above.

average piston velocity of 6,569-fpm

is neither affordable nor durable.

It's been said here many times, but RPMs are the most expensive horsepower there is. IMHO, for conventional production-based engines, as the RPMs go up past 8,000 RPMs, the cost per durable horsepower goes up logrithmically.

thnx, jack vines.

P.S. - we're about due for another of these threads, "I just found a 283" steel crank and am going to put it in a 350" block and build a 10,000 RPM screamer, because I like to beat people by using little cubes."

[Stan Weiss]

That's an average piston velocity of 6,569-fpm.
I hope you're not planning on running it for more then a few seconds.

Pro Stock get up in that area and they only cost about xxxk per.

[mtkawboy]

Good luck keeping a flywheel on an 11,000 RPM 6 cylinder with the harmonics problems

[CamKing]

Pro Stock get up in that area and they only cost about xxxk per.

They build and dyno one 3 doors down from my shop.
On a clear day, you can actually see the Dollar signs floating through the roof, and into the sky.

I've got no problem with turning 11,000rpm.
We can do it reliably with a 4valve V8 with a 64mm stroke, and keep the cost under $100K

[steve25]

I would move the drivers section of the car to in front of the motor so that above 8k when the engine parts start fly out and off they do not knock you out!

[$um Toy]

I totally agree that those are high piston speeds, however they are not unatttainable. You did not say what the intended use of the engine was. Is it a drag race only deal? I am currently running a 648 inch BBC with a 4.875" stroke in a pulling truck with max rpm of around 8500. That is an average piston speed of 6900 FPM without problems and we run for about 14 seconds at WOT.

[$um Toy]

Cam King, you must be right aroung the corner from V. Gaines I take it? That must be interesting having a pro stocker so close to home.

[Horsewidower]

What would be on your list if you would like to rev 11.000 rpm?

An unlimited wallet.

You've got twin turbos, why do you need 11,000 rpm? And I ask that seriously.

Bob

[TwinTurboM3]

I dont want anymore as this thread turned into a debate rather than an informative thread.

[CamKing]

I am currently running a 648 inch BBC with a 4.875" stroke in a pulling truck with max rpm of around 8500. That is an average piston speed of 6900 FPM without problems and we run for about 14 seconds at WOT.

A old retired guy in South Carolina just won the Lottery and made $85 million after taxes.
His experience doesn't make any of us any more likely to win the Lottery.
Anything's possible.
If it's my money, I'd rather bank on the probable, over the possible.

[FastFourierTransportation]

Good luck keeping a flywheel on an 11,000 RPM 6 cylinder with the harmonics problems

Inline-6 engines have no harmonic problems as they are better balanced than all but a V12, if that.

It's V-6's which have the end-to-end vibration problems.

[SWR]

I'm building a 11000 rpm Cosworth motor with 82mm stroke, and we have had to revise a whole lot of stuff just to even think of reliability.... with a 91mm stroke I'd run it 402 meters at a time, max.