LS7 Head Has Been Outdone!
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LS7 Head Has Been Outdone! http://www.ls1lt1.com/forum/showthre...8494#post78494
I'm sure most of you guys have heard of ARAO, aka Dominion. But it appears they're coming into the LSx world. Just some interesting bit of info there. Hopefully they get 'em on some engines soon! However, only the big dogs will have these because the price.
I think anything racing a 4 valve LSx motor will look an 87 Peugeot.
I'm sure most of you guys have heard of ARAO, aka Dominion. But it appears they're coming into the LSx world. Just some interesting bit of info there. Hopefully they get 'em on some engines soon! However, only the big dogs will have these because the price.
I think anything racing a 4 valve LSx motor will look an 87 Peugeot.
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Originally Posted by Third Gear
http://www.ls1lt1.com/forum/showthre...8494#post78494
I'm sure most of you guys have heard of ARAO, aka Dominion. But it appears they're coming into the LSx world. Just some interesting bit of info there. Hopefully they get 'em on some engines soon! However, only the big dogs will have these because the price.
I think anything racing a 4 valve LSx motor will look an 87 Peugeot.
I'm sure most of you guys have heard of ARAO, aka Dominion. But it appears they're coming into the LSx world. Just some interesting bit of info there. Hopefully they get 'em on some engines soon! However, only the big dogs will have these because the price.
I think anything racing a 4 valve LSx motor will look an 87 Peugeot.
How do 32 valve heads add 100hp over 16 valve heads when BOTH flow the same "cfm"??????
.
Originally Posted by Quickin
LS7 heads were far outdone before they ever came out.
How do 32 valve heads add 100hp over 16 valve heads when BOTH flow the same "cfm"??????
.
How do 32 valve heads add 100hp over 16 valve heads when BOTH flow the same "cfm"??????
.
Originally Posted by Quickin
LS7 heads were far outdone before they ever came out.
How do 32 valve heads add 100hp over 16 valve heads when BOTH flow the same "cfm"??????
.
How do 32 valve heads add 100hp over 16 valve heads when BOTH flow the same "cfm"??????
.
The thread says the ls1 heads flow 388 on the intake! That's first gen ls1 heads outflowing ported LS7 heads!
If the dual intake valves really weigh less than the single large intake valves then the smaller ratio rockers means a seriously high revving engine...
Looks very promising but far from being bolt on and go...
i dont care what it says about using lighter springs for smaller valves, the lifter is still actuating two valves and pushing down two springs, not to mention that dual rocker arm setup. all in all that setup has to heavier then a traditional setup
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BTW. scroll to the bottom of this page
http://www.araoengineering.com/pakag...age%203%20Port
These things are flowing 440 cfm on the intake, ye they are for sbc egines but these will destroy etp canted healve heads, and if i'm not mistaken they have comedown in price, i believe they used to be 15,000.00 us for a set
http://www.araoengineering.com/pakag...age%203%20Port
These things are flowing 440 cfm on the intake, ye they are for sbc egines but these will destroy etp canted healve heads, and if i'm not mistaken they have comedown in price, i believe they used to be 15,000.00 us for a set
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Originally Posted by RyneZ06
i dont care what it says about using lighter springs for smaller valves, the lifter is still actuating two valves and pushing down two springs, not to mention that dual rocker arm setup. all in all that setup has to heavier then a traditional setup
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From: BFE
Originally Posted by RyneZ06
i dont care what it says about using lighter springs for smaller valves, the lifter is still actuating two valves and pushing down two springs, not to mention that dual rocker arm setup. all in all that setup has to heavier then a traditional setup
If those deliver as promised you'll wish to have the $$$ to get some.
All this flow is great, but an engine can only effeectively use so much air.
As great as the LS7 manifold is, to put it on top of a $10K set of heads is friggin lunacy. It would choke them down the same way as a LS6 does a set of ET265's.
As great as the LS7 manifold is, to put it on top of a $10K set of heads is friggin lunacy. It would choke them down the same way as a LS6 does a set of ET265's.
Last edited by Stang's Bane; Apr 12, 2007 at 07:51 AM. Reason: fuckin spelling
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From: Cleveland
Originally Posted by Stang's Bane
All this flow is great, but an engine can only effeectively use so much air.
As great as the LS7 manifold is, to put it on top of a $10K set of heads is friggin lunacy. It would choke them down the same way as a LS6 does doa a set of ET265's.
As great as the LS7 manifold is, to put it on top of a $10K set of heads is friggin lunacy. It would choke them down the same way as a LS6 does doa a set of ET265's.
Ahh, but that's what RPM is for. I'm thinking 500ci spinning 10000k rpm and sounding like a motorcycle engine. As for the manifold, I figure a guy that can afford these is probably going to go sheetmetal, but they had to give it "some kind" of intake manifold pattern. There have been heads out like these before, most notably the Cyril Batten b4 heads that were fitted to big block chevy's. The same billet head stretched out two more cylinders for Batten's v12 design. If I remember right, his v12 utilized bb chevy bore spacing, bb ford main journals, bb chevy rod journals, custom cranks and rods. one aluminum one was 777ci, his magnesium block one hit 1000ci easily. The only problem is the v8's and v12's were HUGE in width, although not that much wider than a 426 hemi. It took work to shoe-horn them into cars. The other issue is the blocks had to be ordered without head studs to accomodate the Batten pattern. On top of the heads, a guy had to buy a block....but check out the v8 that I used to own and was sold to the gentleman that went to Bob Norwood for fitting in an impala ss
http://www.hotrod.com/techarticles/1...s_engine_swap/
http://www.turbomagazine.com/tech/02...nycar_integra/ is an example of the v8 head on a billet 4cyl. block.
True, RPM will extract more HP with the ci. I honestly can't see them selling more than 5 sets of these a year. They will be illegal for 99% of race classes, leaving the only market for them to the street. In order to build an engine to support the RPM these heads will need to extract the benefit from them, you are looking at somewhere in the range of $35-$40K, for a street engine.
I am not knocking these heads, I am just struggling to see the benefit/cost ratio.
I am not knocking these heads, I am just struggling to see the benefit/cost ratio.
Bane is exactly right, they would never allow these in races. if you have the money to buy an engine for a class that allows these type of heads you are not going to be building an LS1 for it....
maybe not
Originally Posted by SOLLIDROLLAH
BTW. scroll to the bottom of this page
http://www.araoengineering.com/pakag...age%203%20Port
These things are flowing 440 cfm on the intake, ye they are for sbc egines but these will destroy etp canted healve heads, and if i'm not mistaken they have comedown in price, i believe they used to be 15,000.00 us for a set
http://www.araoengineering.com/pakag...age%203%20Port
These things are flowing 440 cfm on the intake, ye they are for sbc egines but these will destroy etp canted healve heads, and if i'm not mistaken they have comedown in price, i believe they used to be 15,000.00 us for a set
I don't know about "destroy" I'd bet a lot of money they would not even come close to the power that our canted valve head will produce. It is not a flow thing, even though I can put our canted valve at 450 cfm with a slightly larger valve. 4 valve heads take quite a bit more r&d to actually make power with. 4 valve heads have a different type of mixture motion. Swirl is common on all two valve wedge style heads and tumble is what you will see on 4 vavle heads. Tumble is very tricky to get right and usually requires a piston design and proper valve placement in relationship to the bore to actually make work regardless of what a flow bench will tell you.
Originally Posted by cary et performance
I don't know about "destroy" I'd bet a lot of money they would not even come close to the power that our canted valve head will produce. It is not a flow thing, even though I can put our canted valve at 450 cfm with a slightly larger valve. 4 valve heads take quite a bit more r&d to actually make power with. 4 valve heads have a different type of mixture motion. Swirl is common on all two valve wedge style heads and tumble is what you will see on 4 vavle heads. Tumble is very tricky to get right and usually requires a piston design and proper valve placement in relationship to the bore to actually make work regardless of what a flow bench will tell you.
Flow bench numbers do not always equal horsepower....
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I know everyone is pretty divided on these silly heads: "well in theory" "well these heads have this" "these other heads have that". I just want to see them get put on a car to see if the HP to BS ratio is accurate.
They look cool, but will anyone ever see these on a car? I've yet to hear from anyone running those on a Gen I/II motor... we'll just have to see.
They look cool, but will anyone ever see these on a car? I've yet to hear from anyone running those on a Gen I/II motor... we'll just have to see.
