: 
9000 - 10000 rpms
Cory, are Bo and Monty going to run again this year?
Kurt
Kurt
Originally Posted by comp builder
9500 rpms will be very hard to reach, and very costly also!! The bore/stroke combo would need to be something like 4.185" x 3.25" to get you a 358ci that would breathe well to that RPM, with a killer set of 400cfm+ heads. We did some back to back dyno tests with a 4.0" x 3.635" combo for an IHRA race motor with a FAST 90mm intake and a Wilson billet bank intake, and the FAST falls way off at 7500+ rpms and the Wilson keeps running. Peak was at about 8200-8300 with class legal 210 cc heads. Also the valvetrain gets to be a little questionable even with the Jesel rockers because of the short pivot length available, you get an extreme amount of sweep across the valve tip.
Just some food for thought
Cory Mattson
Patterson Racing
Just some food for thought
Cory Mattson
Patterson Racing
Originally Posted by matt420c
i think the C5R can rev to that high, but im an idiot lol
The C5R and C6R Corvette shift gears at 6200-6300 they do not rev to high RMPs..that is why they very seldom have any engine failures..if memory serves only one in the last 3 or 4 years.. they are torque monsters to say the least..
Roller cam bearings, bronzed lifter bushings, ETP canted valve heads @ 430+ cfm, aluminum rods, lightweight crank, low tension rings, light pistons, SUPER lightweight valvetrain, etc. etc. etc....
You will be rebuilding that motor regularly and you will go through valvesprings like you go through popcorn at the movie theater.
You will be rebuilding that motor regularly and you will go through valvesprings like you go through popcorn at the movie theater.
^ Exactly... no point. He who makes the most power w/ the least RPM needed wins endurance races, less overall work on the parts/motor.
I admit SB V8's sound wicked at high rpms, but there's really no point going over 7500.
At VIR there are some guys that come out in mid 60's vintage mustangs. Thave have destroked 302s in them (289 I believe) with soldi rollers turning over 8000... they sound amazing flying down the front straight.
If I remember correctly Texas Speed makes a big bore/short stroke shortblock... my buddy wants to build a Factory Five GTM w/ one. I told him just to get a LS7 w/ a cam haha.
I admit SB V8's sound wicked at high rpms, but there's really no point going over 7500.
At VIR there are some guys that come out in mid 60's vintage mustangs. Thave have destroked 302s in them (289 I believe) with soldi rollers turning over 8000... they sound amazing flying down the front straight.
If I remember correctly Texas Speed makes a big bore/short stroke shortblock... my buddy wants to build a Factory Five GTM w/ one. I told him just to get a LS7 w/ a cam haha.
Tell the ricers that are making fun of you that you have 2 four cylinder motors in you car to their one. And to continue the ricer logic, tell tham that since you have 2 motors a 5500prm redline equals 11,000 rpm. BTW, I had a go-kart back in the early 60's that had a McCullock (don't remember how to spell it) 250 chain saw motor that ran alky and we were spinning that to 25,000 rpm. Of course the stroke was like 1.5" and it was a 1 cylinder motor, but it was American made and out rpm'ed any ricer chainsaw motor in any import today.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Originally Posted by ArKay99
Tell the ricers that are making fun of you that you have 2 four cylinder motors in you car to their one. And to continue the ricer logic, tell tham that since you have 2 motors a 5500prm redline equals 11,000 rpm. BTW, I had a go-kart back in the early 60's that had a McCullock (don't remember how to spell it) 250 chain saw motor that ran alky and we were spinning that to 25,000 rpm. Of course the stroke was like 1.5" and it was a 1 cylinder motor, but it was American made and out rpm'ed any ricer chainsaw motor in any import today.
F1's redline @ 18K and there N/A,lol
BTw..the ricers where making fun of the 5500 redline?WTF its not a diesel...
Wonder when nascar will switch to the GenIV block....then we'll have some nasty high rpm engins out there
BTw..the ricers where making fun of the 5500 redline?WTF its not a diesel...
Wonder when nascar will switch to the GenIV block....then we'll have some nasty high rpm engins out there
Thread Starter
On The Tree
Joined: Nov 2003
Posts: 199
Likes: 0
From: SeaCoast NH
Originally Posted by Cobra4B
my buddy wants to build a Factory Five GTM w/ one. .
I was thinking this also. would sound killer with a high reving smallblock.
Mostly curiosity though
To see a 9,000 to 10,000rpm small-block look no further than NASCAR motors. These guys regularly spin their expensive pieces to 9,500 - 9,700ish on a lot of the tracks they run on and that's for a good amount of laps. Of course they run all the top of the line stuff (including lifters made out of composites), but it is still a pushrod motor, so it can be done. Whether or not us Joe Shmoes should (or can afford to) do it, is a whole other story. If you can hit 7,000rpm your probably doing pretty well on a street-driven car.
BTW, F1 regularly spin to 2-stroke rpms of 20,000 - 22,000rpms. Of course that's in a 3.0L (now smaller) motor with overhead cams.
BTW, F1 regularly spin to 2-stroke rpms of 20,000 - 22,000rpms. Of course that's in a 3.0L (now smaller) motor with overhead cams.
Originally Posted by Kraest
No point.
You aren't going to make power that high with anything but the most expensive and race-orientated setup. Severely ported heads (nearing 400 cfm) along with a huge cam (280s/290s @ .050 with an inch+ of lift) and race-gas only compression 13:1+. High RPM-only motor all built with lightweight/billet everything, etc.
I believe Futral built one and had one for sale for around $20,000 that consisted of a 427 with heavily ported C5R heads, 13.5:1, gigantic 1+ inch lift cam, etc that made somewhere in the high 700 horsepower range @ 8500 rpm.
Mike
You aren't going to make power that high with anything but the most expensive and race-orientated setup. Severely ported heads (nearing 400 cfm) along with a huge cam (280s/290s @ .050 with an inch+ of lift) and race-gas only compression 13:1+. High RPM-only motor all built with lightweight/billet everything, etc.
I believe Futral built one and had one for sale for around $20,000 that consisted of a 427 with heavily ported C5R heads, 13.5:1, gigantic 1+ inch lift cam, etc that made somewhere in the high 700 horsepower range @ 8500 rpm.
Mike
The one for sale did 792@8500, and we also had the other 427 that did 854hp and we turned it 8600-8700 rpm.
https://ls1tech.com/forums/showthrea...hlight=fms+427
TECH Regular
Joined: Mar 2006
Posts: 471
Likes: 0
From: Rolesville, NC
Originally Posted by slt200mph
The C5R and C6R Corvette shift gears at 6200-6300 they do not rev to high RMPs..that is why they very seldom have any engine failures..if memory serves only one in the last 3 or 4 years.. they are torque monsters to say the least..
Originally Posted by john@futralmotorsports
The one for sale did 792@8500, and we also had the other 427 that did 854hp and we turned it 8600-8700 rpm.
https://ls1tech.com/forums/showthrea...hlight=fms+427
https://ls1tech.com/forums/showthrea...hlight=fms+427
Jesus H. Christ
No wonder you blew that "other" shop out of the city.
FormerVendor
Joined: Nov 2001
Posts: 3,065
Likes: 6
From: Houston, Tx.
It mainly depends on the valvetrain. Anyone can turn 10,000 rpm but that's different than making real power up there. It takes true professionals to build a race engine that actually makes big power up there at those rpm levels. It's not something a hobbyist should attempt in my own opinion.
You could put a very high rpm oriented lobe with a very light Ti valve and low lift and easily spin up there and have no problems but you wouldn't make good power.
I'd be more concerned with making good power and not turning rpm for rpms sake alone unless that's what's gonna make you happy above all else.
Of course in an all-out engine you are going to turn it as hard as you can at whatever size you end up choosing but if you aren't building a HP/inch Comp motor I wouldn't destroke anything. On the street no one cares if you're running a smaller engine that still make good power. You'll just be slower because even the big engine car can still weigh as little as you can.
You could put a very high rpm oriented lobe with a very light Ti valve and low lift and easily spin up there and have no problems but you wouldn't make good power.
I'd be more concerned with making good power and not turning rpm for rpms sake alone unless that's what's gonna make you happy above all else.
Of course in an all-out engine you are going to turn it as hard as you can at whatever size you end up choosing but if you aren't building a HP/inch Comp motor I wouldn't destroke anything. On the street no one cares if you're running a smaller engine that still make good power. You'll just be slower because even the big engine car can still weigh as little as you can.
