4 bbl on a 2bbl intake

[stegomon]

work for an auto parts store chain. was looking at some crap on the shelf and saw one of them adapters to slap a 4bbl on a stock intake. pros cons?

thinking of putting it on my 84 ranger with a duraspark conversion. i don't want mad horse power...just something for a little more kick and fun.

i do know that there is a 4bbl intake that i can get. but i don't want to drop $200 into this engine...might as well do a 4.0 swap

 

[BLOODBANE]

Unless your gonna do some work to the engine (cam and heads) why? Dumping more fuel down the throat and it not really wanting to take it is kind of a waste. On my stroker everything is matched, or build around the cam grind. Lots of folks do it though, just never made much sense to me

 

[Will]

It's stupid--don't do it.

I don't feel like writing for an hour.

 

[cody93]

dont do it, theres only so much fuel an engine can suck in without cam/valve mods

 

[Sunk]

You'll need more air to go with that extra go-juice too.

 

[stegomon]

ok i wont do it....thanks guys

 

[small ranger]

Or you could look at it this way......Holly 390 cfm carb has smaller primaries than a Holly350 cfm carb. you will get better atomization of fuel when running on the primaries, and as long as the vac secondaries are tuned correctly they will only open as wide as nesessary. Now if you use a double pumper 4 barrel then you will be wasting gas.

 

[85_Ranger4x4]

Or you could look at it this way......Holly 390 cfm carb has smaller primaries than a Holly350 cfm carb. you will get better atomization of fuel when running on the primaries, and as long as the vac secondaries are tuned correctly they will only open as wide as nesessary. Now if you use a double pumper 4 barrel then you will be wasting gas.

Bingo, that is the whole point of a 4bbl.

James S Denton on here took a dremel to his factory 2.8 intake and made it a 4bbl intake, search for it.

 

[Will]

Everytime the air charge hits something, fuel particles get knocked out of it. Cutting the 2bbl manifold would be a better way to do that.

The 390 may well have smaller primaries. It's also rated at 390cfm at a lower manifold pressure than the 2bbl rating. That means the 390, if rated like a 2bbl, would be something larger--500cfm maybe. It's not a given that the primaries are smaller, but I would believe it.

I like the correct sized carb. How about grinding the center out to open a plenum in the manifold and installing a progressive, 2bbl?

http://www.webercarbsdirect.com/32_36_DGV_p/22680.005.htm

 

[kimcrwbr1]

CFM and venturi size you could possibly bore out the ports on the manifold to fit a 2150 carb with 1.21 venturies. The 2.8 comes stock with 1.08 venturies but if you put a 1.21 carb on it there is not enough cfm for the venturi cluster to atomize the fuel properly and that raw fuel just washes down into the crancase by the rings and will reduce ring life. If you want balls 5.0 l (302) and a 4 BBL.

 

[85_Ranger4x4]

CFM and venturi size you could possibly bore out the ports on the manifold to fit a 2150 carb with 1.21 venturies. The 2.8 comes stock with 1.08 venturies but if you put a 1.21 carb on it there is not enough cfm for the venturi cluster to atomize the fuel properly and that raw fuel just washes down into the crancase by the rings and will reduce ring life. If you want balls 5.0 l (302) and a 4 BBL.

I tried a 1.21 2100 as an alternative to the non-feedback 2150 on my 2.8. I had to sand the carb spacer so the throttle plates wouldn't hit it.

I don't recommend it, plain and simple it was too much carb. Ford did put the 1.08 2150 on 302's (where I got one) but nothing near as big as 1.21 on a 2.8.

 

[kimcrwbr1]

I believe the carb spacer felpro # 60529 is for the 1.21 venturi carb I just dont know if anyone has opened the bore on the 2.8 intake the size of the 1.21 venturi carb. Still it would probably need some custom work oversize pistons and custom cam to achieve the CFM needed to process the fuel.