Revving to 14,000 rpms?
TECH Enthusiast
Joined: Jul 2004
Posts: 521
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This is silly.
I figured something up with my engine analyzer. If an LS1 was destroked to 300ci, it would still be pulling almost TWELVE THOUSAND G-FORCES at 14K RPM! Just for comparison, a stock displacement LS1 pulls only (and I say only) about 4300 Gs @ 8500RPM, and guys really push it getting there.
What material do you plan on asking to experience forces 14000 times its own weight?
Now.... I think the skeptics have adequately illustrated the point that this is an impossibility for an individual without some high engineering degree and advanced understanding of metalurgy.
I figured something up with my engine analyzer. If an LS1 was destroked to 300ci, it would still be pulling almost TWELVE THOUSAND G-FORCES at 14K RPM! Just for comparison, a stock displacement LS1 pulls only (and I say only) about 4300 Gs @ 8500RPM, and guys really push it getting there.
What material do you plan on asking to experience forces 14000 times its own weight?
Now.... I think the skeptics have adequately illustrated the point that this is an impossibility for an individual without some high engineering degree and advanced understanding of metalurgy.
Last edited by derek_silvy; Oct 13, 2004 at 08:12 AM.
TECH Fanatic
Joined: Oct 2003
Posts: 1,839
Likes: 0
3.) Most of us, including you, can't afford it.
Wondering where you came up with that last conclusion.
Wondering where you came up with that last conclusion.
You dont, so, you don't
3.) Most of us, including you, can't afford it.
Wondering where you came up with that last conclusion.
Wondering where you came up with that last conclusion.
[edit]
Damn it Z98, you beat me to it.
this is my opinion on it...not that it counts..im a newbee
if 14000 rpms was the efficient way to make power....then why wouldnt people with unlimited funds do so?...like nhra pro stock.
it just seems like 10k is the hot set up...on many different forms of max effort drag race engines. "maybe" theres a reason why...maybe it starts to get less efficient after that or something...otherwise it would be happening...theres plenty of people that have the coin to be trying this in the racing world.
if 14000 rpms was the efficient way to make power....then why wouldnt people with unlimited funds do so?...like nhra pro stock.
it just seems like 10k is the hot set up...on many different forms of max effort drag race engines. "maybe" theres a reason why...maybe it starts to get less efficient after that or something...otherwise it would be happening...theres plenty of people that have the coin to be trying this in the racing world.
Pineapple, I think it's great that you are thinking outside the box, and I am annoyed at the people who throw freakin' smiley faces and just laugh without giving a reason.
You'll never be able to get an ls1 the way we know it to that high an rpm:
-loads on the rotating assembly increase exponentially w/ rpm. in other words, the forces at 8k rpm are not double that at 4k rpm, but thye are actually 4X larger....you get the idea.
-F1 cars can rev that high because (among other things) they have much lighter valvetrains and bottom ends. Lighter parts allow less momentum and lower forces on the assembly. Also, as mentioned before, the stroke is much less, resulting in lower piston speeds (pistons cover less distance in the same amount of time as our ls1s for a given RPM. This lower piston speed reduces the momentum/forces on the piston, allowing it to hold together when it changes direction.
So due to the limits of our materials you cannot build an ls1 to rev that high. There is no material that you could use to make our engines hold up at 14000 rpm.
So you CAN make an engine rev that high-it just wont be an ls1 due to it's inherent design: large rotating mass, heavy valvetrain, and bore/stroke.
Small engines can rev incredibly high due to their low mass - I've used a model airplane engine that revs to 20,000. it only cost 200 bucks. It's all a matter of physics, and the the limitations of the materials avaliable.
You'll never be able to get an ls1 the way we know it to that high an rpm:
-loads on the rotating assembly increase exponentially w/ rpm. in other words, the forces at 8k rpm are not double that at 4k rpm, but thye are actually 4X larger....you get the idea.
-F1 cars can rev that high because (among other things) they have much lighter valvetrains and bottom ends. Lighter parts allow less momentum and lower forces on the assembly. Also, as mentioned before, the stroke is much less, resulting in lower piston speeds (pistons cover less distance in the same amount of time as our ls1s for a given RPM. This lower piston speed reduces the momentum/forces on the piston, allowing it to hold together when it changes direction.
So due to the limits of our materials you cannot build an ls1 to rev that high. There is no material that you could use to make our engines hold up at 14000 rpm.
So you CAN make an engine rev that high-it just wont be an ls1 due to it's inherent design: large rotating mass, heavy valvetrain, and bore/stroke.
Small engines can rev incredibly high due to their low mass - I've used a model airplane engine that revs to 20,000. it only cost 200 bucks. It's all a matter of physics, and the the limitations of the materials avaliable.
Last edited by Grimes; Oct 13, 2004 at 10:34 PM.
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Staging Lane
Joined: Sep 2004
Posts: 99
Likes: 0
From: Fargo, ND
Well, just keep in mind that with the best engineers and mechanics available, Formula 1 cars running at those speeds have engines break without lasting the race. And they're using engines more suited for high rpm operation. You'd also probably have to design and fabricate the crankshaft, rods, pistons, valvetrain, and other stuff I forgot. On the other hand, that would be one phat all-motor powerhouse.
