Why not a solid roller to 8500 rpms?
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
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.
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.
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
(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
Last edited by 99blancoSS; Feb 12, 2008 at 11:08 AM.
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
bores. Aluminum rod, 4 inch eagle crank. Ran 9.70's all motor.
Ran this setup 6 years ago
Jay Johnson
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'
Joined: Oct 2006
Posts: 2,608
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From: Webb City, MO...out in the garage
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.
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.
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Russ Kemp
Teching In
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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.....
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.....
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.
TECH Fanatic
Joined: Oct 2002
Posts: 1,842
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From: Dallas, North Mexico
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.
TECH Fanatic
Joined: Oct 2002
Posts: 1,842
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From: Dallas, North Mexico
Ps: Engine braking at 12000 rpm can break the tires loose.
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.
Did you know Nextel Cup still runs them, too?!
