700hp n/a...how can it be done?
700hp n/a...how can it be done? I'm building a L92 based 427. I want to make 700 hp. He is what I have so far.
L92 block
Callies 4.125" crank
Using Howards steel rods 6.125"
Kooks 1 7/8"-2" stepped headers
D&D T56
He are the constraints I have. Must run on pump gas, so no higher than 12.0 cr. I would rather have it a hydraulic roller but not throwing out a solid. The only problem with the solid roller is the oiling. I don't want to run a dry sump system, so i want to stay under 7500rpms. I have a peterson external wet sump pump that I can use. The cam can be as big as needed...actually the bigger the better!
It's a 6 speed so it won't be a problem on the street. I'm not sure what heads to use ET LS7, ET 265, Livernois L92...etc.
What do you guys think? Is it possible? Give me your input!
L92 block
Callies 4.125" crank
Using Howards steel rods 6.125"
Kooks 1 7/8"-2" stepped headers
D&D T56
He are the constraints I have. Must run on pump gas, so no higher than 12.0 cr. I would rather have it a hydraulic roller but not throwing out a solid. The only problem with the solid roller is the oiling. I don't want to run a dry sump system, so i want to stay under 7500rpms. I have a peterson external wet sump pump that I can use. The cam can be as big as needed...actually the bigger the better!
It's a 6 speed so it won't be a problem on the street. I'm not sure what heads to use ET LS7, ET 265, Livernois L92...etc. What do you guys think? Is it possible? Give me your input!
Originally Posted by mr2guru
IMO to make 700hp it's going to take a solid roller, high compression and a lot of rpm.
Chances of doing it on pump gas with only a 427 are very slim.
Chances of doing it on pump gas with only a 427 are very slim.
Trending Topics
The know it all's know it all
Joined: Oct 2006
Posts: 500
Likes: 0
Originally Posted by brad8266
I was thinking the same thing.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
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
The know it all's know it all
Joined: Oct 2006
Posts: 500
Likes: 0
Originally Posted by gator's 99TA
intersting post. i like what i hear. nothing easy about 700 flywheel hp on pump gas and no methenol.
On The Tree
Joined: Oct 2003
Posts: 150
Likes: 0
From: harrisburg PA
I'm not seeing the problem here...the exhaust event that is required to make it really work, helps the whole situation....
is it possible...YES, with not so good induction, and non-engineered valvetrain...good luck!!
Dennis
is it possible...YES, with not so good induction, and non-engineered valvetrain...good luck!!
Dennis
The know it all's know it all
Joined: Oct 2006
Posts: 500
Likes: 0
Originally Posted by airflowdevelop
I'm not seeing the problem here...the exhaust event that is required to make it really work, helps the whole situation....
is it possible...YES, with not so good induction, and non-engineered valvetrain...good luck!!
Dennis
is it possible...YES, with not so good induction, and non-engineered valvetrain...good luck!!
Dennis
Call Cary at ET he can help !
The know it all's know it all
Joined: Oct 2006
Posts: 500
Likes: 0
Originally Posted by MUSTANGEATER
I think what Dennis meant was exhaust timing event and how it works with a pump gas motor with a high SCR. Not reffering to exhaust itself.
Lets see.... who hear has seen 600rwhp SAE on 427 LS motors? I have. I don't think a single plane would greatly improve the peak HP numbers over a LS7 intake, and it's only helpfull if you need more RPM than 6500rpm. Even then it works well to 7200rpm, not perfect but well.
FWIW Sean, Dennis knows what he is talking about, DEFINATELY more than about 99.99% of the guys who are registered for this forum.
The compression is really the only thing that is going to change between a pump gas motor and a race motor in terms of this HP level. LS7 heads are surely capable of this on pump gas, no need to spend mega $$ on bling ETP's.
And for ***** and giggles people PLEASE stop thinking that overlap has anything to do with bleeding off compression!
Hell I think this is doable with LS7 castings and a hyd roller, but that's just me ;-)
Bret
FWIW Sean, Dennis knows what he is talking about, DEFINATELY more than about 99.99% of the guys who are registered for this forum.
The compression is really the only thing that is going to change between a pump gas motor and a race motor in terms of this HP level. LS7 heads are surely capable of this on pump gas, no need to spend mega $$ on bling ETP's.
And for ***** and giggles people PLEASE stop thinking that overlap has anything to do with bleeding off compression!
Hell I think this is doable with LS7 castings and a hyd roller, but that's just me ;-)
Bret
The know it all's know it all
Joined: Oct 2006
Posts: 500
Likes: 0
I am thinking defferently becuase ive seen motors 50hp shy of this goal. the Ls7 intake i a great piece but its got such a high runner impedence that it holds the head back a ton. I am sure another 200-300rpm with what already done with a mild cam change on the 408 i mentioned would easily break 700hp. Might be by just a few ponys but very very doable.
I don't think it'll take more then a 11.5:1 engine either.
Overlap can drop compression but it depends on where the EVO and IVC are you know that. When people stop obessing over DCR I will stop bringing it up. but if you let out the cylinder fill geuss what. you will have less DCR. its fiarly straight forward. Less cylinder fill less DCR. trap the cylinder fill and the DCR goes up. its dynamic compression. SCR is always there staying right on the number.
I just didn't get what he was saying. Yes the exhuast event could be critical.you could use it to lower pressure after TDC to help manage the ciritcal afterburn zone where detonation takes place. me i would keep that valve shut drop the SCR and worry aout keeping the burn on the piston dome. thats just me.
from what I have been privy to as far as whats been done a single plane/ls6/ls7 would bring Tq up 1000rpm and woul definately make this much more doable.
I don't think its doable with factory Ls7 casting to much runner volume for the flow rate. thats why i siad ETP ls7 heads. Now a proerply worked l92 head might be able to. the factory head with a ls7 intake might come close but no cigar.
Sean
I don't think it'll take more then a 11.5:1 engine either.
Overlap can drop compression but it depends on where the EVO and IVC are you know that. When people stop obessing over DCR I will stop bringing it up. but if you let out the cylinder fill geuss what. you will have less DCR. its fiarly straight forward. Less cylinder fill less DCR. trap the cylinder fill and the DCR goes up. its dynamic compression. SCR is always there staying right on the number.
I just didn't get what he was saying. Yes the exhuast event could be critical.you could use it to lower pressure after TDC to help manage the ciritcal afterburn zone where detonation takes place. me i would keep that valve shut drop the SCR and worry aout keeping the burn on the piston dome. thats just me.
from what I have been privy to as far as whats been done a single plane/ls6/ls7 would bring Tq up 1000rpm and woul definately make this much more doable.
I don't think its doable with factory Ls7 casting to much runner volume for the flow rate. thats why i siad ETP ls7 heads. Now a proerply worked l92 head might be able to. the factory head with a ls7 intake might come close but no cigar.
Sean
Originally Posted by SStrokerAce
Lets see.... who hear has seen 600rwhp SAE on 427 LS motors? I have. I don't think a single plane would greatly improve the peak HP numbers over a LS7 intake, and it's only helpfull if you need more RPM than 6500rpm. Even then it works well to 7200rpm, not perfect but well.
FWIW Sean, Dennis knows what he is talking about, DEFINATELY more than about 99.99% of the guys who are registered for this forum.
The compression is really the only thing that is going to change between a pump gas motor and a race motor in terms of this HP level. LS7 heads are surely capable of this on pump gas, no need to spend mega $$ on bling ETP's.
And for ***** and giggles people PLEASE stop thinking that overlap has anything to do with bleeding off compression!
Hell I think this is doable with LS7 castings and a hyd roller, but that's just me ;-)
Bret
FWIW Sean, Dennis knows what he is talking about, DEFINATELY more than about 99.99% of the guys who are registered for this forum.
The compression is really the only thing that is going to change between a pump gas motor and a race motor in terms of this HP level. LS7 heads are surely capable of this on pump gas, no need to spend mega $$ on bling ETP's.
And for ***** and giggles people PLEASE stop thinking that overlap has anything to do with bleeding off compression!
Hell I think this is doable with LS7 castings and a hyd roller, but that's just me ;-)
Bret
Last edited by Sean Collins; Jan 19, 2007 at 12:26 AM.
