Engine choice for fast bracket/Quick 8/16 car
#92
Just to clarify: I want to build the car for two different types of events. Plain old Saurday night bracket racing, where consistency and reliability are the key to success. But also have it caopable of running Quick 8 or Quick 16 at various tracks in the region. So, I have been thinking of a blower, turbo, or nitrous setup. Run low boost/no nitrous at the local track on Saturday nights and then crank it up for the occasional Qucik event. Once you start running mid sevens or quicker, it becomes impossible to get the dead-on consistency to win the brackets. And it gets too maintenence intensive to do it week in-week out.
There is a way out of that conundrum I have considered - an NA BBC that is HUGE and therefore not twisted too hard. Kind of the best of both worlds. Launch it easy and shift it early for the brackets and go ***** to the wall for Quick events. But that is old hat and just doesn't interest me. A boosted SB of whatever generation does, but especially the gen III.
Rich
#95
#96
#97
Originally Posted by rskrause
There is a way out of that conundrum I have considered - an NA BBC that is HUGE and therefore not twisted too hard. Kind of the best of both worlds. Launch it easy and shift it early for the brackets and go ***** to the wall for Quick events.
Food for thought:
The LS7 gets it's output with a 211/230 .593/.588 camshaft. Guys are seeing 550FWHP with just a longtube header swap. Take away the fuel mileage, emissions, and need to idle with a glass of wine sitting on the intake requirements and it's easily a 650HP cam only motor. Now take that same motor, with the same camshaft that got you to 650HP, and add another 84 cubes to eat up that cam and bring things back down to idling with wineglasses territory: then tweak the heads.
#99
So those LS7 heads have some real potential then, huh? Do you think they can adequately support a 500ci motor, or are we going to have to wait for Dart to step up to support this steroid injected version of the "mighty mouse."
#100
Well we are using modified ones to support 440cubes up to 8000rpm, but they aren't very efficent up there. I don't really think there is much that can support 500cubes out there yet. They are a very good head imho, and there might be enough room in there to get them to work over 6000rpm with 500cubes but I haven't run any numbers on that yet.
The REAL issue is getting 500cubes, you don't do that cheaply. The LSX in a tall deck version could pull that off, but it's all stroke. Reguarless of what GM says about the LSX sealing 4.250" bores on a 4.400" bore centerline is not a easy task. 4.200" is as far as I would build one on that centerline, that leaves you with a 4.500" stroke and stuffing a small and strong rod in between the bottom of the bores and pan rails.
Bret
The REAL issue is getting 500cubes, you don't do that cheaply. The LSX in a tall deck version could pull that off, but it's all stroke. Reguarless of what GM says about the LSX sealing 4.250" bores on a 4.400" bore centerline is not a easy task. 4.200" is as far as I would build one on that centerline, that leaves you with a 4.500" stroke and stuffing a small and strong rod in between the bottom of the bores and pan rails.
Bret
#101
Denny:
You serious about that invite? I have a business trip to Austin coming up sometime in the next few months - it hasn't been scheduled yet. I was thinking of staying around a few days. Martinis = good! And if combined with good food and some bench racing, that sounds like heaven. Plus, you have no income tax and don't have to wait a year and bare your soul before a judge to buy a gun!
Rich
You serious about that invite? I have a business trip to Austin coming up sometime in the next few months - it hasn't been scheduled yet. I was thinking of staying around a few days. Martinis = good! And if combined with good food and some bench racing, that sounds like heaven. Plus, you have no income tax and don't have to wait a year and bare your soul before a judge to buy a gun!
Rich
OH..... BTW. My wet bar wins everytime. Never been able to beat it yet. Can't say I haven't tried.
#103
Well we are using modified ones to support 440cubes up to 8000rpm, but they aren't very efficent up there. I don't really think there is much that can support 500cubes out there yet. They are a very good head imho, and there might be enough room in there to get them to work over 6000rpm with 500cubes but I haven't run any numbers on that yet.
The REAL issue is getting 500cubes, you don't do that cheaply. The LSX in a tall deck version could pull that off, but it's all stroke. Reguarless of what GM says about the LSX sealing 4.250" bores on a 4.400" bore centerline is not a easy task. 4.200" is as far as I would build one on that centerline, that leaves you with a 4.500" stroke and stuffing a small and strong rod in between the bottom of the bores and pan rails.
Bret
The REAL issue is getting 500cubes, you don't do that cheaply. The LSX in a tall deck version could pull that off, but it's all stroke. Reguarless of what GM says about the LSX sealing 4.250" bores on a 4.400" bore centerline is not a easy task. 4.200" is as far as I would build one on that centerline, that leaves you with a 4.500" stroke and stuffing a small and strong rod in between the bottom of the bores and pan rails.
Bret
So the LS7 heads aren't up to the task then? I guess I will just have to wait for Dart to step up and fill the void once big cube LSx motors really start showing up in racing.
#104
Paying with a LS7 head now that could do 6500rpm on 500cubes and maybe go out to 7000rpm but it's going to be pushing it. Anything CAN be done, but you could make more HP per cube by doing it better. Going down 0.2+ hp/cube in a class where you run more lbs per cube ain't a good idea to me.
The biggie is really the intakes attached to the heads.
Denny, BTW that 630rwhp I think will easly do the 650rwhp+ at some point here soon.
Bret
The biggie is really the intakes attached to the heads.
Denny, BTW that 630rwhp I think will easly do the 650rwhp+ at some point here soon.
Bret
#105
Paying with a LS7 head now that could do 6500rpm on 500cubes and maybe go out to 7000rpm but it's going to be pushing it. Anything CAN be done, but you could make more HP per cube by doing it better. Going down 0.2+ hp/cube in a class where you run more lbs per cube ain't a good idea to me.
The biggie is really the intakes attached to the heads.
Denny, BTW that 630rwhp I think will easly do the 650rwhp+ at some point here soon.
Bret
The biggie is really the intakes attached to the heads.
Denny, BTW that 630rwhp I think will easly do the 650rwhp+ at some point here soon.
Bret
Are you and OldSStroker going to the 40th celebration in Detroit next month?
Jeremy