GrannySShifting

iTrader: (10)

yes, weve seen 8643 rpm on datalogs with stock pcm, and fueling tables are there until 8000. It doesnt matter though, as most engines require less fuel at say 8500 than 8000 rpm, it usually end up a bit richer up there... unless its a centrifugal power adder or something of that sort

KCFormula

iTrader: (4)

Dry sump, short runner sheetmetal intake, and a hella light bob-weight will do it but why not set your car up for the max hp instead of max RPM?
My 4.125" stroke 421 has sat in the burnoutbox (7-8sec) at 8500rpm with a wet sump and also sees its fair share of street time. I see no reason to go overboard and worry about the max RPM. Unless you have all high dollar parts specifically choosen for high RPM your setup probobly won't make power up that high anyway, don't expect to make that kind of RPM with off the shelf parts.

99blancoSS

iTrader: (115)

Yep, a lot of educating has happened since I posted this thread. Wound up going with a 457'ish CID sleeved ls2 and All Pro heads, LS7 intake. Waffled between a solid roller and the hydraulic for a while but finaly came up with a solution (honestly I think we're borrowing some offshore racing parts). Engine is currently being built and I've been asked to not give out to many details. Its a special order, not a run of the mill combination and requires a very knowledgable builder to get it right. We're looking at 2 months til I get any numbers posted but 7500 rpm is the potential max it will see. Looking at 600+ rwhp n/a all the way!
I wont lie, I'm looking for the combination that all other n/a engines will be judged by

Jay Johnson

iTrader: (16)

I spun my Iron 402 Solid roller to 8300rpm about 40 passes. Truck oil pan, sleeved lifter
bores. Aluminum rod, 4 inch eagle crank. Ran 9.70's all motor.

Ran this setup 6 years ago


Jay Johnson

GrannySShifting

iTrader: (10)

black/gray camaro? I remember that car a while back if so

RE AND CHERYL

iTrader: (31)

You can't tune past that point. If you rev the engine past that point the PCM will use the spark and fuel tables for the highest RPM on the table (7200 RPM I beleive) until the revs fall below that RPM.

Yes...The engine will operate above 7200 RPM
No....It can't be tunned at those RPMs because the F-body tables don't go that high.

Re'

Jantzer98SS

iTrader: (54)

I hear there is a certain off the shelf n/a 427 in the works in Oregon that might be the one to set the bar.

2000_SS

iTrader: (24)

i hate to respond without any real advice....but....


buy a crotch rocket....16,000 RPM's sounds way cooler than 8,000

i had a '05 R6, it would cure ANY need for speed or need for any kind of audio stimulation.

99blancoSS

iTrader: (115)

Interesting. I'm guessing it's going to be a solid roller. We're talking pump gas here as well so its got to be a screamer!

Russ K

iTrader: (1)

This is a screen pic of the spark & VE tables from a 1999 Camaro. The Corvette tables have the same rpm axis.



Russ Kemp

m6ls1maro

flat tapper lifters are definatly not for high rpms... roller lifters would be able to take it idk about solid lifters... you have to think about how each work and which was has less frition obviously the roller lifter but the solid lift doesnt sit directly above the cam but its offset and both the cam lobes and solid lifters are dome shaped and the lifter rotates within its journel... if they wouldnt do this they would wear down way to fast... think about it its just metal on metal rubbing together.....

1BadAction

iTrader: (10)

ls1 joe

iTrader: (37)

Flat tappets!!!!!!!! Do you know that in the Nascar Sprint cup series they stil run flat tappet cams. At the open tracks they see constant rpms from 7800 to 9700rpms with that falt tappet cam, granted these are stelite welded cores and they have oil squirters over each lobe.

treyZ28

Are you in a restricted class?. If not, seriously, just supercharge it. Make more power at a lower rpm for less money and more reliability. There is nothing inherently good about RPM.

treyZ28

Dude... going from a K4 GSXR 600 to an LQ9 silverado is the biggest head trip ever. One idles at 1300rpm, and the other cruises on the highway at 1450rpm.

Ps: Engine braking at 12000 rpm can break the tires loose.

blackz93

iTrader: (2)

Did you know Nextel Cup still runs them, too?!

93LS1RX7

iTrader: (8)

Since it isnt Nextel Cup any more you are wrong. The series is now called the Nascar Sprint Cup......

blackz93

iTrader: (2)

Yeah, I started thinking about that last night when I went to bed.

I wish they'd quit changing the name so much. Winston Cup FTW!!