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Re: 511 Indy tunnel ram which carbs [Re: mopar dave] #2722041
12/06/19 02:00 PM
12/06/19 02:00 PM
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Val-haul-ass... eventually
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BradH Offline
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Originally Posted by mopar dave
If the calibration is the issue with the xp line, then that's not a big deal as I would be recalibrating the carbs for the t ram. I thought there may have been an issue with the venture design as well?

Depends on the model. The "950" w/ the 1.60" venturi seems like a step backwards, based upon Mark Whitener's battery of flow bench testing different carb body & booster styles. However, the smaller carbs are better. The one pictured started with an "850" main body having a 1.56" venturi.

Re: 511 Indy tunnel ram which carbs [Re: BradH] #2722044
12/06/19 02:04 PM
12/06/19 02:04 PM
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Mt Morris Michigan
mopar dave Offline OP
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Ok, I see. The 750 ultra xp would be what I would buy. I think they have a 1.375 venture.

Re: 511 Indy tunnel ram which carbs [Re: Harry's Taxi 2] #2722049
12/06/19 02:10 PM
12/06/19 02:10 PM
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Thumperdart Offline
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YOU get it and Andy loves and pushes the EFI but once you TRULY understand how carbs work and how EASY they are to tune, EFI makes zero sense......


72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: 511 Indy tunnel ram which carbs [Re: Thumperdart] #2722065
12/06/19 03:10 PM
12/06/19 03:10 PM
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Come on Dom, with your experience they're easy for you to tune... but, physically replacing jets, air bleeds, etc. will never be as easy as making a few keystrokes on a laptop.
Loading up an entirely new tune in seconds from a file? Saving the old one on a thumb drive? Emailing your settings so someone else can upload them to their EFI?
whistling

Re: 511 Indy tunnel ram which carbs [Re: DrCharles] #2722098
12/06/19 06:54 PM
12/06/19 06:54 PM
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madscientist Offline
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Originally Posted by DrCharles
Come on Dom, with your experience they're easy for you to tune... but, physically replacing jets, air bleeds, etc. will never be as easy as making a few keystrokes on a laptop.
Loading up an entirely new tune in seconds from a file? Saving the old one on a thumb drive? Emailing your settings so someone else can upload them to their EFI?
whistling




What makes you think someone emailing you a tune up has a clue? It's still the same thing. If you can't read a plug and make a tuning decision it doesn't matter if its key strokes or brass you are changing.

And I lay the blame squarely at the feet of Holley for the stupid information they STILL disseminate and have allowed the authors who write books about Holley carbs to do the same.

If you call Holley today for other than simpleton info, you will most likely get bad info. And that's on Holley.


Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
Re: 511 Indy tunnel ram which carbs [Re: madscientist] #2722104
12/06/19 07:18 PM
12/06/19 07:18 PM
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Although your point is not wrong, what makes you think I said or even implied that? shruggy
I was refuting the statement that "carbs are easier than EFI". That's all. Anything else, you inferred on your own.

Naturally, incorrect adjustments are also easier to do wrongly than by hand...
The old saying is that a computer can make a mistake in 1 second that it takes 1000 people 1000 years to make by hand whistling

Re: 511 Indy tunnel ram which carbs [Re: madscientist] #2722119
12/06/19 08:29 PM
12/06/19 08:29 PM
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mopar dave Offline OP
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I agree. I just called Holley last week. I think I knew more than the guy on the other end of the phone.

Re: 511 Indy tunnel ram which carbs [Re: mopar dave] #2722160
12/06/19 10:33 PM
12/06/19 10:33 PM
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Originally Posted by mopar dave
I agree. I just called Holley last week. I think I knew more than the guy on the other end of the phone.




If I had to bet everything I own on which one of you knew more, I'd lay everything on you. And I'm not joking.


Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
Re: 511 Indy tunnel ram which carbs [Re: mopar dave] #2722287
12/07/19 12:57 PM
12/07/19 12:57 PM
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Taxes & Virus's R-US, NY
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Originally Posted by mopar dave
working on another induction option. 511 with 12.5:1 compression a 270@50 SFT and an Indy 400-I4-15 t ram. Street/strip deal, which carbs would give best all around performance, 650,660 or 750? I see most like the 750's and there are some that like the 660's. My thinking is to err on the small side with the 650's. It seems the Indy tunnel ram has a very large plenum and I thought maybe the smaller carbs would help crutch this on this combo. 5100 stall and car weights 3380#. Appreciate your opinion on this. Thanks



Dave,

Still looking for more out of that combo I see......Is this for the motor in the vid in you're signature? What are you shifting at currently?

Me, I like the 750 or 650's.....What ever Thumper would recommend. I also like the Indy TR over the others for the larger plenum. My little 400 likes anything that gives it more plenum over what it has. The more I take out of the intake, the better it gets. The more spacers, the better it gets. Good heads need to breath....My 2cents...


'71 Duster 400/512
https://www.youtube.com/watch?v=Znuo3jMUXTk (6.00 at 114.05mph)
https://www.youtube.com/watch?v=Y9hxSMAWoII (9.66 at 139mph)

'70 Cuda, Plan C....605 Hemi
https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph)(823hp and still tuning)
https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9)
Re: 511 Indy tunnel ram which carbs [Re: DrCharles] #2722312
12/07/19 02:34 PM
12/07/19 02:34 PM
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Thumperdart Offline
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If u call me w/info I can easily suggest a tuning change w/the bag of jets and bleeds I send in every single box that leaves here.......a 5/1/6 wrench and a slotted screwdriver is all we need and maybe a distributor wrench......


72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: 511 Indy tunnel ram which carbs [Re: Dragula] #2722362
12/07/19 06:16 PM
12/07/19 06:16 PM
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Mt Morris Michigan
mopar dave Offline OP
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No, those are old vids of the small block. Here it is. https://youtu.be/PVAo6OkpMHg
I tried shifting at 6600 ,6700 and 6800.

Re: 511 Indy tunnel ram which carbs [Re: mopar dave] #2722368
12/07/19 06:29 PM
12/07/19 06:29 PM
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AFAIK there is no good math for plenum volume, runner CC vs. carburetor CFM, too many variables like vertical distance from throttles to floor, CR, overlap.
The area in the plenum floor adjacent to the 5 & 7 ports has a longer and stronger vacuum pull than next to the 1, 2, 7 & 8 end cylinders.

Jenkins explained development of TR SBC 45 years ago.
1. make the plenum larger until power on a dyno stops increasing
2. this will have bad response in the car and bad mixture curve
3. reduce plenum 10%

Last edited by polyspheric; 12/07/19 06:31 PM.

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Re: 511 Indy tunnel ram which carbs [Re: polyspheric] #2722375
12/07/19 06:44 PM
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I'm aware of that. The 4/7 swap cams were suppose to be a fix, but I don't think they did much as I see no one using them anymore. Would there be another fix for that I don't know about?

Re: 511 Indy tunnel ram which carbs [Re: mopar dave] #2722381
12/07/19 06:57 PM
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I don't think I have ever heard of grinding a cam for the tunnel ram intakes confused shruggy
I remember back when Modified Production was still racing the cam design and grinds where critical on the short stroke, small C.I. , drag race motors with tunnel rams according to those guys racing those motors back then shruggy
In todays world I look more at the application the motor will be ran in than the intake manifold, maybe that will all change when I go to racing a B1 motor with a tunnel ram with two 1050 CFM Dominator carbs. work


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: 511 Indy tunnel ram which carbs [Re: Cab_Burge] #2722387
12/07/19 07:38 PM
12/07/19 07:38 PM
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I haven't either cab and I just searched it and didn't find much. I did read a post some where that a guy suggested a cam of 7-10* less duration with tunnel ram than what you would run with single carb.

Re: 511 Indy tunnel ram which carbs [Re: mopar dave] #2722390
12/07/19 07:51 PM
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Originally Posted by mopar dave
I haven't either cab and I just searched it and didn't find much. I did read a post some where that a guy suggested a cam of 7-10* less duration with tunnel ram than what you would run with single carb.


There are two reasons why TR engines lose power.

1. Way too much cam timing. And I should add in the wrong cam timing.

2. Carb calibration. You have double the jet area, doubled the bleed area, doubled the emulsion but you did not double the air flow.

2 shouldn't be an issue for you because you A) like screwing with this stuff and B) you have Dom on speed dial I case you find yourself in the weeds.

Anyone who thinks cam timing doesn't change with induction is just wrong.

In fact, (dating myself a bit here) Coleman Roddy was the first guy (reportedly) to work with the 4/7 swap cam. Once he had a handle on it, he won the Comp Eliminator championship.

It's a big deal to get that sort of thing correct first.

Can't wait to hear your results.


Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
Re: 511 Indy tunnel ram which carbs [Re: madscientist] #2722404
12/07/19 08:55 PM
12/07/19 08:55 PM
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Please read the rules before posting here. This is not the classified forum to buy or sell parts.

Last edited by tboomer; 12/08/19 06:59 AM. Reason: Not a classified forum
Re: 511 Indy tunnel ram which carbs [Re: bigwestloghomes] #2722420
12/07/19 10:50 PM
12/07/19 10:50 PM
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I've never heard of 383 truck motor, or 383 industrial or marine motor confusedT
the only low deck H.D. truck, marine or indusrial motor I have heard of and seen are the 361 truck and industrial motors shruggy


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: 511 Indy tunnel ram which carbs [Re: Cab_Burge] #2723621
12/13/19 01:14 AM
12/13/19 01:14 AM
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Carson City, Nevada
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This is what I run aon a 469 with a M1 low deck tunnel ram.

https://www.holley.com/products/fue...per/specialty_double_pumper/parts/0-9379

They work real good!

Last edited by Biginchmopar; 12/13/19 01:15 AM.
Re: 511 Indy tunnel ram which carbs [Re: Biginchmopar] #2723664
12/13/19 10:23 AM
12/13/19 10:23 AM
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mopar dave Offline OP
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A pair of those is $740 refurbished from Holley right now. They don't come set up for tunnel ram, so what changes did ya have to make IFR, air bleeds, main jet etc?

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