Re: How to fix this intake?
[Re: dizuster]
#3014153
02/10/22 09:23 PM
02/10/22 09:23 PM
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Joined: Mar 2004
Posts: 826 Georgia
66coronet
super stock
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super stock
Joined: Mar 2004
Posts: 826
Georgia
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My combo is a 540 wedge: 13 to 1 comp roller 680 lift Indy -1 345 cnc heads modman with a pair of edelbrock carburetors. 4.10 gear ATI converter Its not a real aggressive combo.
Thanks for sharing.... I saw yours has been 9.49 best? What's it weigh? Mine is a pig (currently 3740 with the turbo motor this modman 485" will replace). It has been a good bit quicker since. With all the ballast out it weighs 3495. I typically run it at 9.75 because its not as violent.
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Re: How to fix this intake?
[Re: AndyF]
#3014249
02/11/22 10:01 AM
02/11/22 10:01 AM
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Joined: Jan 2003
Posts: 4,211 Shelby Twp. Mi
HardcoreB
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Have you talked to Ken at Indy about that intake? I had a chat with him a while back and he said he had some tricks to make power with that intake. He probably has more dyno time with that intake than anyone else in the world so you might as well start there. It is a little easier to talk to Ken these days since Russ is out of the loop. Not sure that you see this but, this is exactly what I knew but, I just wasn't going to call him to pick his brain and not make a purchase. Just the same if one of us makes a solid improvement, it just might benefit the company. Ken has always been helpful sharing what he knows. They could cast them with more runner but, then you'd still get someone cutting them out like you see frequently done on the single planes claiming that's the solution. Makes me wonder what Wilson didn't know when they modified your intakes lol.
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Re: How to fix this intake?
[Re: HardcoreB]
#3014378
02/11/22 03:07 PM
02/11/22 03:07 PM
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Joined: Jan 2003
Posts: 3,511 DFW
mr_340
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master
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Posts: 3,511
DFW
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Darin Morgan says the flat floors are best in an intake because of the pulsing between the cylinders. He said a vertical divider was the worst he ever tested. Wet flow is hard to predict from what I've read about it.
Floyd Lippencott IV
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Re: How to fix this intake?
[Re: mr_340]
#3014415
02/11/22 04:52 PM
02/11/22 04:52 PM
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Joined: Oct 2007
Posts: 4,219 New York
polyspheric
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master
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New York
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Worst for he was doing. For Chrysler, it was the smallest, cheapest, lightest design to add a 2nd 4 bbl.
Horses for courses
Boffin Emeritus
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Re: How to fix this intake?
[Re: polyspheric]
#3014630
02/12/22 10:10 AM
02/12/22 10:10 AM
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Joined: Jul 2003
Posts: 4,831 Holland MI Ottawa
2boltmain
master
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master
Joined: Jul 2003
Posts: 4,831
Holland MI Ottawa
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Its a shame a dual carburetor under hood intake manifold is simply not made for the 340 360 mopar. Offenhauser still makes a unit but its design is for the 273 heads. It will bolt to 340 heads but its not ideal and its a design from the 1960s. Ford and Chevy have dual plane dual quad manifolds in traditional and airgap versions and from multiple manufactures. I like tunnel rams but I really like under hood dual quad setups. Harkens back to a time where to go faster- you absolutely had to add another carburetor!
Keep old mopars alive.
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Re: How to fix this intake?
[Re: 2boltmain]
#3014691
02/12/22 01:51 PM
02/12/22 01:51 PM
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Joined: Jan 2003
Posts: 14,539 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
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So. Burlington, Vt.
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The Mod Man is available for LA, Magnum, and W2 Mopar, along with a variety of tops.
Although, these days “available” is a relative term.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: How to fix this intake?
[Re: fast68plymouth]
#3014694
02/12/22 01:58 PM
02/12/22 01:58 PM
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Joined: Jan 2003
Posts: 14,539 So. Burlington, Vt.
fast68plymouth
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I Live Here
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So. Burlington, Vt.
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I had a customer try one on a 470. He was running a 400-2, but wanted to play in the NSS stuff. 4 speed car, And he used Ede carbs. I seem to think the big problem he had with it was a stumble right after the launch. I don’t recall there being a big speed difference at the top end between the two.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: How to fix this intake?
[Re: fast68plymouth]
#3014722
02/12/22 03:56 PM
02/12/22 03:56 PM
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Joined: Oct 2007
Posts: 4,219 New York
polyspheric
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master
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New York
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a stumble right after the launch
That's what the divider cures, by reducing plenum volume by 50%.
Boffin Emeritus
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Re: How to fix this intake?
[Re: fast68plymouth]
#3014738
02/12/22 04:57 PM
02/12/22 04:57 PM
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Joined: Jan 2003
Posts: 4,211 Shelby Twp. Mi
HardcoreB
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I had a customer try one on a 470. He was running a 400-2, but wanted to play in the NSS stuff. 4 speed car, And he used Ede carbs. I seem to think the big problem he had with it was a stumble right after the launch. I don’t recall there being a big speed difference at the top end between the two. Very much appreciated and thanks for sharing. I think the best cure would be a 'pump-shot' type of carb(S ). Whatever I do to the plenum I will take into account a compromise between ideal volume, packaging limits, and fuel distribution. It's unlikely the plenum will be significantly smaller than it is now in volume.
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Re: How to fix this intake?
[Re: HardcoreB]
#3062428
07/25/22 01:58 PM
07/25/22 01:58 PM
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Joined: Jan 2003
Posts: 4,211 Shelby Twp. Mi
HardcoreB
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I lowered the floor some. The plenum will have some awkwardly shaped wood in 4places to help lengthen the runners and 'bellmouth' the extensions. I'm not sure I'll be adding much of a center divider. I do not feel it needs ANY reduction in volume for any application, if anything that bridge down the center helps RUNNER LENGTH. If we could afford more delays I would split the top and locate the carbs more central to the ports. IN THIS PIC the runner roof was just roughed-in quickly AT THE PLENUM to see better the rest of the as-cast alignments.
Last edited by HardcoreB; 07/25/22 02:11 PM.
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Re: How to fix this intake?
[Re: dizuster]
#3093126
11/10/22 12:36 PM
11/10/22 12:36 PM
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Joined: Jan 2003
Posts: 4,211 Shelby Twp. Mi
HardcoreB
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Hey hey...you're giving away our secrets! Lol
This spacer was not done by me. Credit goes to Scott's long-time friend Dave. He's good, I'm a hillbilly.
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Re: How to fix this intake?
[Re: dizuster]
#3093129
11/10/22 12:40 PM
11/10/22 12:40 PM
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Joined: Jan 2003
Posts: 4,211 Shelby Twp. Mi
HardcoreB
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OP
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Hey hey...you're giving away our secrets! Lol
All the 'tricks' aren't disclosed, lol. Truth being I'd like to see Indy revise the lower casting because if this works you'd think it would sell at a premium price. Thought myself about making 'insert kits' a guy could rub and then epoxy together because...it's probably going to be better than a single 4 no-matter how bad I am.
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Re: How to fix this intake?
[Re: HardcoreB]
#3093152
11/10/22 01:53 PM
11/10/22 01:53 PM
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Joined: Oct 2007
Posts: 4,219 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,219
New York
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I like it! AFAIK the ideal shape for the divider nose isn't a knife blade (frequently seen), but a full radius, where the diameter = divider thickness.
Boffin Emeritus
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