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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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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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.
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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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Joined: Jul 2004
Posts: 19,317 State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,317
State of confusion
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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.....
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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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Joined: Apr 2006
Posts: 4,220 West Plains, MO
DrCharles
master
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master
Joined: Apr 2006
Posts: 4,220
West Plains, MO
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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?
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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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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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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? 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
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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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Joined: Apr 2006
Posts: 4,220 West Plains, MO
DrCharles
master
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master
Joined: Apr 2006
Posts: 4,220
West Plains, MO
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Although your point is not wrong, what makes you think I said or even implied that? 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
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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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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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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. 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
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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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Joined: May 2004
Posts: 12,392 Taxes & Virus's R-US, NY
Dragula
I Live Here
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I Live Here
Joined: May 2004
Posts: 12,392
Taxes & Virus's R-US, NY
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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...
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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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Joined: Jul 2004
Posts: 19,317 State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,317
State of confusion
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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.....
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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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Joined: Oct 2007
Posts: 4,206 New York
polyspheric
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Joined: Oct 2007
Posts: 4,206
New York
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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.
Boffin Emeritus
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Re: 511 Indy tunnel ram which carbs
[Re: mopar dave]
#2722390
12/07/19 07:51 PM
12/07/19 07:51 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
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master
Joined: Sep 2014
Posts: 4,457
Washington
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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. 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
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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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Joined: Aug 2003
Posts: 43,204 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,204
Bend,OR USA
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I've never heard of 383 truck motor, or 383 industrial or marine motor T the only low deck H.D. truck, marine or indusrial motor I have heard of and seen are the 361 truck and industrial motors
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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