how to get 4bbl on stock log manifold

[matt1967]

I don't need to do this, for my application but I know it will work, and sometimes a 4bbl is more tunable than a 2 ( and there made small enough anyway ) like for turbocharging. anyway, get the apropriate adaptor from sumit, to mount a 2300 holley ontop of a stock log, then get a squarebore- Holley 2300 adaptor, flip it upside down, sit the 4bbl on the squarebore flange, and bolt everything togther.

 

[Bort62]

Why on earth would you want to do that?

 

[CobraSix]

with those adaptors, My guess is you'll have difficulting closing the hood on most of the smaller cars (mustangs, falcons, etc).

Slade

 

[matt1967]

Why on earth would you want to do that?

tunibility, for custom stuff. like turbocharging. wouldn't have any performance gains on a stock motor, over what a 2bbl would. Or also, runninng a Holley Projection TBI system, they run a standard squarebore flange

 

[Bort62]

It wouldnt have any gains on any motor, stock or otherwise.

You are going to be limited by your min venturi area anywhere in the system - and that is at the 1 bbl adapter. There is no point in trying to cram a 4bbl through a 1bbl hole.

 

[CobraSix]

Well, forced air is a slightly different scenario. But even with a TBI, you'd see no performance gains until you did force air. By that point, a 2V would still probably out perform since you'd lose less suspended fuel since it doesn't have as many turns. Remember, each one of those bends will cause turbulence, slow down the air/fuel mixture, and cause more of the fuel to fall out of suspension leading to no performance gain.

I still say you wouldn't fit it under the hood either. Heck, I could barely fit the Offy 3x1V adaptor with 1100s and a thin air cleaner under my hood.

Slade

 

[Bort62]

Forced air isnt really any different... It's just fluid dynamics.

A restriction like that causes a pressure drop - plain and simple. You are not going to force any more air through a 2" venturi adapted to a 1" hole that you will through the 1" hole in the first place. You will get the same amount of pressure drop no matter which way you slice it (to a first order approximation)

 

[Anonymous]

well, my 2 cents prolly aint worth a penny, but i do have a question. if youre gonna add a turbo or blower any way why not just take the extra time and (minimal) extra bucks and direct mount your 2v or projection with a blow through design? just me personally (your car do what you want) i cant see spending 3 to 5 grand on either a blower or turbo only to choke off with cheezy adapters that barely work to begin with. want a good example? look at the restrictor plates in nascar. blown or not you wont be getting MAXIMUM gains---you may see SOME but not MAX. like i said--- its your car, but i think youd wind up with a hard to tune, ill running dawg that you couldnt close the hood on. hey if im wrong i wont be to proud to say so---its just an opinion is all

 

[matt1967]

well, my 2 cents prolly aint worth a penny, but i do have a question. if youre gonna add a turbo or blower any way why not just take the extra time and (minimal) extra bucks and direct mount your 2v or projection with a blow through design? just me personally (your car do what you want) i cant see spending 3 to 5 grand on either a blower or turbo only to choke off with cheezy adapters that barely work to begin with. want a good example? look at the restrictor plates in nascar. blown or not you wont be getting MAXIMUM gains---you may see SOME but not MAX. like i said--- its your car, but i think youd wind up with a hard to tune, ill running dawg that you couldnt close the hood on. hey if im wrong i wont be to proud to say so---its just an opinion is all

the log isnn't wide enough to direct mount a 4bbl, some kind of intermediate adaptor would be needed. I only put this topic up, because someone might be able to use it, I'm going to run a Transdapt or Clifford adaptor, and a Holley 2300 for my project.

 

[Anlushac11]

8)

Matt, I dont think you want to do that.

Im betting your thinking Holley model 4150 4bbl but that is too big for our engines. That means you would be better off running a Holley 390cfm 4bbl.

But if your at that point there are plenty here who will tell you that it will bea easier to just mount a modified Holley 500cfm 2bbl for a modified engine or a holley 350cfm on a lightly modified mostly stock 200. The adapter will be easier and tuning is just as easy, its almost half a 4150/4160.

I think you should do more reading here before pursuing your 4bbl idea.

Only exception would be if you get a Aussie 2v head or a CI Alloy head. On those heads a 4bbl intake is/will be available and they breath well enough to take advantage of the biger carb.

Also tuning for a blow through turbo will be easier with a 2bbl.

 

[matt1967]

8)

Matt, I dont think you want to do that.

Im betting your thinking Holley model 4150 4bbl but that is too big for our engines. That means you would be better off running a Holley 390cfm 4bbl.

But if your at that point there are plenty here who will tell you that it will bea easier to just mount a modified Holley 500cfm 2bbl for a modified engine or a holley 350cfm on a lightly modified mostly stock 200. The adapter will be easier and tuning is just as easy, its almost half a 4150/4160.

I think you should do more reading here before pursuing your 4bbl idea.

Only exception would be if you get a Aussie 2v head or a CI Alloy head. On those heads a 4bbl intake is/will be available and they breath well enough to take advantage of the biger carb.

Also tuning for a blow through turbo will be easier with a 2bbl.

I knew a 4160 would be too big, but a 390 holley or even a 450 holley, might do it. like I said, I'm going to run a 2300 2bbl 350 CFM, I just ordered 1 from summit today. I'm leaving that 4bbl adaptor idea out on the table, for anyone who might need it.