Highest reving LS engine?
Thread Starter
Instructor
Joined: Oct 2006
Posts: 122
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From: Georgia
Highest reving LS engine?
OK, so another one of those Honda guys who thinks that Hondas are the best cars ever is touting how awsome his 4 banger with 20 pounds of boost is so awsome because he can get 9k rpms out of it and no V8 can handle that. So I was just wondering how high people are getting their LS engines up to.
Safety Car
Joined: Oct 2004
Posts: 4,816
Likes: 132
From: Plano TX
ask him what kind of torque he is producing at 2000-3000 rpms.. Probably around 100 foot pounds at the rear wheels.. These little 4 bangers don't have any useable torque until around 5000 rpms. Thats when they come to life. The LS motors are a whole different animal.. Hes comparing oranges to apples.. Tell your buddy I have a gas powered model Radio controlled car. That little 2 stroke engine turns over 20,000 rpms!! I thought about putting a honda engine in it but they only turn 9000 rpms
Safety Car
Joined: Sep 2003
Posts: 3,558
Likes: 2
From: Cape Coral FL
The limiting factor to revs and reliability is piston speed. The LS series motors are a long stroke motor. This results in higher piston speed for a given rpm, but it creates more torque due to the length of fulcrum created by the width of the crankshaft to give it that stroke.
If you shortened the stroke of an LS1 to 2" you could probably rev it to the moon (with appropriate valvetrain considerations), but wouldn't get as much torque out of it, or at least the torque curve wouldn't be very flat across the power band, or it wouldn't be as wide.
Katech has a destroked LSx that will rev to 8k reliably.
F1 motors rev to 25k reliably due to design.
I have to agree that just because he can rev his motor to 9k doesn't mean anything.
Tell him to take his motor to NA, OEM build, then put an OEM build LS1 against that same motor.
Conversely, build an LSx to handle 20 lbs of boost and rev to 9k rpm's. What kind of a motor would THAT be?
Who do you think would win? Besides, you'd sound and look much better doing it too.
If you shortened the stroke of an LS1 to 2" you could probably rev it to the moon (with appropriate valvetrain considerations), but wouldn't get as much torque out of it, or at least the torque curve wouldn't be very flat across the power band, or it wouldn't be as wide.
Katech has a destroked LSx that will rev to 8k reliably.
F1 motors rev to 25k reliably due to design.
I have to agree that just because he can rev his motor to 9k doesn't mean anything.
Tell him to take his motor to NA, OEM build, then put an OEM build LS1 against that same motor.
Conversely, build an LSx to handle 20 lbs of boost and rev to 9k rpm's. What kind of a motor would THAT be?
Who do you think would win? Besides, you'd sound and look much better doing it too.
Last edited by ArKay99; Jan 23, 2010 at 10:37 AM.
Racer
Joined: Oct 2007
Posts: 380
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From: Knoxville Tennessee
A Honda S2000 has a stoke of 84mm where as the LS1's is 91.9, that's only .3" longer. I'd say the real limiting factor is being OHV and the more expensive parts needed to reliably turn 7k+
F1 motors have solenoid assisted valvetrain, which I can't wait until it's affordable enough for street cars. Can you imagine a car with no cam, but 16 solenoids? You can have a tune that gives you a BIG choppy idle, MONSTER low end torque and MASSIVE peak HP....all in 1 motor!
F1 motors have solenoid assisted valvetrain, which I can't wait until it's affordable enough for street cars. Can you imagine a car with no cam, but 16 solenoids? You can have a tune that gives you a BIG choppy idle, MONSTER low end torque and MASSIVE peak HP....all in 1 motor!
Safety Car
Joined: Sep 2003
Posts: 3,558
Likes: 2
From: Cape Coral FL
I left out for brevity that mass at the end of that stroke is a huge contributing factor. It gets to the point that the forces on the connecting rods at higher piston speeds with heavier reciprocating weights becomes too great to keep everything together.
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Burning Brakes
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From: Nouvelle Ecosse
Former Vendor
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From: Virginia Beach Virginia
Former Vendor
Joined: Dec 2009
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From: 19804
The school of automotive machinist's 433 ci lsx shifts at 9700rpms and has ran 8.58@157 all motor at 3500 pounds. A bottom end that stays together + heads that move air + a stable valvetrain = 9000+ rpm lsx.
Drifting
Joined: Jun 2009
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From: Queen Creek AZ
OK, so another one of those Honda guys who thinks that Hondas are the best cars ever is touting how awsome his 4 banger with 20 pounds of boost is so awsome because he can get 9k rpms out of it and no V8 can handle that. So I was just wondering how high people are getting their LS engines up to.
Instructor
Joined: Jun 2008
Posts: 220
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From: Somers Point New Jersey
SAM has a mustang with a 400ci ford that revs almost 11K. National record holding car. he is right that rpm makes hp. but if u lack in displacement ur still behind. theres no replacement for displacement.
http://www.samracing.com/95mustangresults.html
http://www.samracing.com/95mustangresults.html
Last edited by Targa98; Jan 23, 2010 at 10:09 PM.
Racer
Joined: Apr 2009
Posts: 359
Likes: 25
From: San Antonio TX
I don’t think the school's mustang is turning 11k... we were shifting at 9600 I believe about a year and a half ago. But Joe Hunneycutt was turning his LSX shootout motor about 10,500 I believe, and NHRA pro stock motors turn 10,000-11,000 every race with about the same stroke as an LS1... hell our pro mod hemi's turn 8900-9500 (depending on track conditions) with a 4.100 stroke. Either way, you need a solid roller in these cars to turn that kind of RPM, and you really don’t need to. Just remember RPM stands for "Ruins people’s motors". On another note 7200 is pretty easy to do with a good smooth cam profile, with normal hydraulic roller lifters.
Burning Brakes
Joined: Aug 2009
Posts: 816
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From: Virginia Beach Virginia
Hey bro I work with a guy here in MD he told me his brother works or at least goes there last name of Briggs. You know him?
