quickest et,s on an edelbrock carby

Fuel and Air Systems

  1. matty wardle

    matty wardle mopar dedicated

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    whats the quickest et,s you,ve seen with a single edelbrock carby....i kinda treat holleys like i do chevys with abit of disdain,i have a 451 stroker and i want to go quick with an edelbrock
     
  2. 360duster

    360duster Well-Known Member

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    my car ran 12.2 with the 750 cfm EDE carb, #1407. It´s a 68´Valiant 2dr, 408ci sb. I´m pretty sure it could pick up a little with the 800 cfm carb (AVS or AFB). Meantime i replaced it with a 750 Aluminium HP Double Pumper from Holley, best ET so far 11.9, still tuning. This was with some other mods, too (converter), i don´t think the Holley picked up that much. If i can get my hands on one of these 800 cfm Eddys i´ll give it a try, they are ok in my opinion.

    Michael
     
  3. CUDA69

    CUDA69 FABO Gold Member FABO Gold Member

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    12.34 on an Edelbrock 750 #1411.
     
  4. famous bob

    famous bob mopar misfit

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    11.40`s in a vega, 383 stroker , before going to a 406
     
  5. Hysteric

    Hysteric Well-Known Member

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    Matty I would look at the 800 AVS instead of the 750 AFB for the cubes you're running or look to run 2 600's.

    Guys racing in NSS are well into the 8's with 2 AFB's

    Hysteric
     
  6. BrianT

    BrianT Let's go! FABO Gold Member

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    No time slips yet, but I bought a Thunder series AVS 800cfm for my 408. My builder likes them and has the parts to tune them, so that's what I went with.

    [​IMG]
     
  7. flyfish

    flyfish C8H18+N2O = :-D

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    You can go fast with an eddy carb, however, you will be leaving power on the table. How much power really depends on the combo.

    Walk around the pits at the drag strip and see what most of the faster cars are using for carburetors...I would be willing to bet you find more than 90% of folks using Holley style carbs, because they just make more power. Usually the only ones going fast with other carbs are only doing so because they are limited by what they can use for their race class (like stock classes).

    So yes, you can go fast with an eddy carb...but you could probably go faster with a well prepped Holley.
     
  8. TrailBeast

    TrailBeast Slightly Twisted Member

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    And it been that way for decades. (Holley for speed)
    Blanket statement, but pretty much the way it is.
     
  9. WRB426

    WRB426 Insane 4 Mopars FABO Gold Member

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    12.29 with a 750 eddy. 360la
     
  10. rumblefish360

    rumblefish360 so close yet so far away

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    The problem with the Carter/Edel. carbs is tuning. The Holley based carbs offer many more parts for tuning. With the Edel. Carbs, there is only so much you can get out of them and do to the carb. They are a fine carb to run. Just limited in parts to trick them out. If your slick, you can machine them to add features and flow. But again, your limited. But they are capable.

    The AVS style is a much better choice than the AFB is.
     
  11. whitepunkonnitro

    whitepunkonnitro FABO Gold Member FABO Gold Member

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    The dominance of Holley carbs as much less to do with design than it does available sizes. How many fast cars do you see out there running carbs less than 800 CFM.
    Back to back, take a tuned 600 Eddy and an equally prepped Holley, put them on the same engine on the same day, and it's going to be a toss up which one goes quicker. I always choose the Carter/Eddy over a Holley WHEN PRACTICAL. The Carter design is so much more user friendly once you get to know them.
     
  12. flyfish

    flyfish C8H18+N2O = :-D

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    Any guesses on what size Holley is on my car? It runs 10.5's @ 125mph, and it is street driven almost every weekend of the summer.....I'll give you a hint, it is less than 800.
     
  13. Carman340

    Carman340 Well-Known Member

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    What about mechanical secondaries on a carter or Eddy.?
    I don't have enough vacuum for vacuum secondaries.
    Also, couldn't a Thermoquad be a decent performance choice?
     
  14. EL5DEMON340

    EL5DEMON340 Well-Known Member

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    Just the pump shot alone on the holley is way more easier, quicker, and tunable for variables like stick or auto, stall speed, car weight, etc.. Then you have ease of float adjustment that also make a difference in drivability. Holleys stay cooler than Eddy's.
     
  15. 68dodge

    68dodge Well-Known Member

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    Fastest run with Edelbrock 800 for me was 12:01 and that was with full exhaust, M/T Sportman Pro tires. Might have gone faster with slicks on, just never tried it.
     
  16. twayne24365

    twayne24365 Well-Known Member

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    Flyfish... Ill guess its prolly a 750 on e85 i thought you beeded a bigger carb since it uses more fuel...but ive seen 10 second cars run 650s. But to the OP at the yellowbullet i saw a 70 cuda with a hemi, it had duel edelbrock carbs and was deeeeep in the 10's and i think he cracked 9s, srry its sideways but this is his car
     

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  17. rumblefish360

    rumblefish360 so close yet so far away

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    All 3 late Carter carbs and Edelbrock carbs are mechanical secondary carbs.
    The AFB uses a counter weighted secondary air door. It opens with engine demand. They call it a velocity door.
    The AVS and the TQ use a spring loaded air door. Twist the spring tighter for a later opening, loosen the spring for an eaier opening.

    So, the need for vacuum is out. The worry of lack of vacuum is out.

    The Thermo Quad was designed and but as a race carb first and then later used on everyday engines. They are indeed a good carb but also carry limitations. First would be the available tuning parts required. Secondly there spreadbore design limits the intake. Fuel distribution isn't the best ether. But they can and will perform really well.

    The TQ comes in a small and large primary as well as the hard to find race version.
    The race version shares itself with the first year TQ but not the rest of them.
    While the Holley has enough tuning parts to drive you made and spend lots of money on them, the Carter/Edel. Carbs only have a few items. Dialing the fuel curve in on these carbs can not be brought to the level of a better than basic Holley. You will have to modify the Carter/Edel. To get the carb to a "OK" status at best.

    I myself like to run a TQ and have gotten (or used to be) very good at them. The best was, I would get the carb and rebuild it with a new kit for under $100! 800-850 cfm's for a $100. Not having a lot of money at the time, I thought you would have to be crazy not to go this route even though it wasn't as tuneable.

    A basic Holley, like what you would find on any OE car of the day is more tuneable. But also limited. Spend big bucks on a upper level Holley and it can get crazy.
     
  18. blownhemi

    blownhemi Well-Known Member

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    Interesting thread.

    We just dynoed a 408 stroker with a couple carbs. This was our first time playing with an Edelbrock (pn 1412) so we tried the 950 Holley (list 80805) first. It made 533hp & 530/ft with the Holley and the Edelbrock made 518hp & 517lb/ft.

    On the surface it sounds like the Holley wins by 15hp but the power curve of the Edelbrock was a thing of beauty while the Holley was full of little bumps and shifts. Basically the Holley was good for WOT and that was about it, while the Edelbrock looked good everywhere

    I was impressed with how easy the Edelbrock was to tune and I'll definitely be getting one again.

    The only real problem with the Edelbrock on our combo was that it was showing 2.6 to 2.8inches of vacuum at WOT. Basically even at 800cfm the carby is too small. Maybe we can convince Edelbrock to make a 900 or 1000cfm carby. :)

    The other thing that impressed us was the price. summit list the 1412 at $399 while Holley Ultra Xp is race carb and cost $850.


    518hp and 517lb/ft should see our 70 Dart well into the 11s.
     
  19. BrianT

    BrianT Let's go! FABO Gold Member

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    I wonder what the difference is between the Performer 1412 that you're running and the Thunder 1812 that I bought. At first glance, I don't see a difference?
     
  20. 360duster

    360duster Well-Known Member

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    difference is the secondary air door.....AFB counterweighted, AVS spring loaded.....otherwise they should be pretty much identical. Did you compare the stock metering rods and jet sizes?

    I think it´s true what blownhemi said. There should be a bigger Version like 950 cfm. At what rpm did you see this vacuum?

    Michael
     
  21. rumblefish360

    rumblefish360 so close yet so far away

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    If, IF anybody is actually any good at machine work and knows something about how to re-angle the ghrote blades, the Edelbrock carbs can be bored out to a larger size. The bigger the bore the more of an angle change the butterflies need to be readjusted for.

    The boosters, which can not be bought seperatly, can be whittled down smaller and made smoother.
     
  22. doogievlg

    doogievlg Well-Known Member

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    My fastest time with a Edelbrock was 13.2 but my car was cutting out bad at the end.

    The Eddie vs Holley battle is a true classic. I love my thunder series carb when I am on the street. It is much easier to start and cruises great. My Holley sits on the shelf until the slicks go on, then the Holley goes on. My car picked up some mph and dropped a tenth or two but that could have been from me easing off the timing.
     
  23. Darter6

    Darter6 Well-Known Member

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    11.90's with a 750 Eddy.Torker 383 intake. 3800 lbs fully street driver. 451 stroker
     

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  24. flyfish

    flyfish C8H18+N2O = :-D

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    It started life as a Holley 650dp. I put in a proform main body (making it 750 cfm), ran it for years, then last year I converted it over to e85 with Robmix metering blocks....my point is, you don't have to have a HUGE carb to go fast, but you do need to know what you are doing or your car will be never live up to its FULL potential.
     
  25. rumblefish360

    rumblefish360 so close yet so far away

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    A-Men!!!
     
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