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Rusty_Ranger
01-17-2008, 09:04 PM
hi, i was wondering if the 350cfm carburator fits on the stock manifold? and in the FI swap section is says that the 350cfm TB with the swap really wakes up the 2.8, would this happen as well with the larger carburator? and is any one running a 4bbl on there stock/ported intake? i've seen 4 to 2bbl adaptors and vice versa but i was wondering if it would be worth it?

Broncodude
01-17-2008, 09:38 PM
Are you wanting carb or injection? I have a Holley on a 2.8 and it runs great.

skippy
01-18-2008, 07:43 PM
Are you wanting carb or injection? I have a Holley on a 2.8 and it runs great.

which carb and which manifold?

enginepaul
01-18-2008, 08:21 PM
The throttle body is a different set-up entirely; it still uses a computer, the Holley doesn't.
I never tried it, but I doubt if an adapter would work very well.

Rusty_Ranger
01-19-2008, 08:51 PM
sorry, i wasnt clear enough. i'm keeping the the carburation, i know the diffence of FI vs carburation. i was just compairing what it said about the flow rate of the TB and the response from the engine and if a same flow rate carb would have similar results power wise. i was thinking of keeping the stock manifold but porting it. and for the adaptor, would it be worth puting a small 4bbl on a stock/ported manifold? or would it be a waste of fuel? (BTW I think carburators are rated for flow of fuel [mixed gasoline and air], not just gas right?)

BDAB
01-19-2008, 10:09 PM
I don't see why it wouldn't work but it would not be as powerful for reasons you mentioned. the flow rate from the injector in the throttle body would be more consistent than the carb dumping the fuel in. case in point. in 1988 (maybe all the way through 95, I seem to recall test driving a new 94 Tahoe, called a K5, but it was still a Tahoe, and it was carbed) there were 2 versions of the 350sb availible for the chevy 1500. one was carbed and one was TBI. the TBI has much better throttle response and no choke problems.

you would also need a bigger cam to take advantage of the porting and polishing of the intake. biger cam means bigger exhaust.

those 4bbl to 2bbl adapters are a joke, they serve no purpose and still restrict the flow. the only 2 advantages I seen (on the same car) was on 1976 olds omega that I had. it had a 260ci small block V8 and there was no 4bbl intake for it. Advantage 1 was being able to swap a 4bbl carb on this engine. Advantage 2 was using less gas with the 500 holley than the stock 2bbl because it had small primaries and huge secondaries that didn't open til I put my foot in it. but there is a 4bbl intake for the 2.8L

skippy
01-20-2008, 10:11 AM
ah,but is there a 2 barrel carb that bolts directly to stock manifold?i plan to do the duraspark this summer,and i want the 2150 feedback carb hanging from a nail in the man cave.any thoughts?

Old Red Ranger
01-20-2008, 02:53 PM
The stock "feedback carburetor" should also be replaced with an earlier non emission controlled 2 BBL carburetor to make this conversion function properly. You can get a 2 BBL carburetor from a Ford 2.8L that had a Duraspark ignition or upgrade to a Holley 350 CFM 2 BBL carburetor P/N 0-7448. This will eliminate the need for, and make the stock EEC nonfunctional. This is not a complicated swap. Not as complicated as people make it sound.

copied directly from the tech page. I too am thinking of durasparking this summer and it would appear to me that the Holley unit is a direct bolt on. I've found it online for around $270 at a few places. I would like to get the offy intake manifold, but unless I can find a used one for cheap I will probably just port or extrude hone the stock manifold. I guess we will have to get verification on the compatibility from someone who has actually done the wrenching on this exact setup(holley 2BBL and stock manifold)

skippy
01-20-2008, 03:00 PM
thanks,i printed out the duraspark info and have it on the workbench,i found a 2 barrel at advance auto parts for $174.it's listed for 2.8 pinto and is of course rebuilt.guess i can take it back if it doen't fit.

Tony Raine
01-22-2008, 12:25 PM
i run a holley 350 2 barrel on a duraspark'ed 2.8, and it runs great. i think i ran #58 jets (they come with #61). carb bolts right on. stock throttle cable too. don't use a carb adapter to run a 4-barrel. i used one (quadrajet to 2 barrel intake) and it cracked when i tightened the bolts by hand with just a socket.

http://i2.photobucket.com/albums/y46/tony_raine/My%20Bronco%20II/In%20Jonesboro/Carb%20Swap/100_0964.jpg

skippy
01-22-2008, 03:38 PM
i run a holley 350 2 barrel on a duraspark'ed 2.8, and it runs great. i think i ran #58 jets (they come with #61). carb bolts right on. stock throttle cable too. don't use a carb adapter to run a 4-barrel. i used one (quadrajet to 2 barrel intake) and it cracked when i tightened the bolts by hand with just a socket.

http://i2.photobucket.com/albums/y46/tony_raine/My%20Bronco%20II/In%20Jonesboro/Carb%20Swap/100_0964.jpg

thanks a bunch!picture is worth a thousand words.thats exactly what i had in mind.engine looks kinda naked there.

jester77
01-25-2008, 06:55 PM
uh.... steam cleaner?? Just kidding. This is the setup I am looking for my 85 Ranger 4x4. I can't wait to start my weekend project. My real questions are- Does the Duraspark conversion page give accurate details on changing the ignition?? And mainly- do you notice any improvement in the performance? I really want to get a bit more out of my ranger.

jester77
01-25-2008, 07:14 PM
quick question- what is the round thing with the electrical connector just in front of the carburator?? When you did the swap do you eliminate the EGR valve and the catalytic converter?

skippy
01-26-2008, 12:21 PM
quick question- what is the round thing with the electrical connector just in front of the carburator?? When you did the swap do you eliminate the EGR valve and the catalytic converter?

that would be the egr valve and sensor.i plan to get rid of or blank off the ports between the valve and intake.don't know about the cat,we need some more input from duraspark converts out there.my understanding is that "all" emissions parts can go bye-bye,not that i would do anything to break the law.:shok:

Tony Raine
02-01-2008, 02:36 PM
engine looks kinda naked there.
yeah, getting rid of the stock garbage frees up a lot of room. plus that is an "in progress" pic. at that time, i didn't have some stuff done yet (fuel line, choke cable, etc....)

uh.... steam cleaner?? Just kidding. This is the setup I am looking for my 85 Ranger 4x4. I can't wait to start my weekend project. My real questions are- Does the Duraspark conversion page give accurate details on changing the ignition?? And mainly- do you notice any improvement in the performance? I really want to get a bit more out of my ranger.

if i cleaned the motor, it would be harder to tell which parts are new and which still need to be replaced, haha. mines an 84, so i don't know if yours will be different. mine was just splicing a few wires (didn't use stock plugs), pretty easy stuff. as far as performance (and reliability, and better gas mileage), it was worth every penny.

and i don't have a cat for now (yes, thats illegal), but would like to get one someday after i get all the other problems sorted out. and i don't know about the round thing. engine has been running good for a few years like this, so i'll just leave it alone for now

SNAFUHK
02-06-2008, 09:22 AM
I have a 2.8l with a holly 500 on it and I'm runing duraspark,hedman headers and I have no cat or EGR on it. and it works well the 350 holly will not need any mod's to dolt on I'll get a pix of it soon as i can to show what it looks like

jester77
02-10-2008, 10:22 AM
Bought all the duraspark stuff off of the duraspark conversion page. Next step is to buy the holley 350- probably next payday- going to get one with the electric choke kit.

I was wondering the statement says remove all the wires except.... That ugly coffee can and smog pump.... I know this is probably easier than I am making it out. BUT Sure makes a man nervous to start this. I have been wrenching on cars my entire 44 years, but I am used to a 69 bronco not this newer stuff. Just seems so simple but if I screw it up.....

Any new photos I can go off of??

OilPatch197
02-10-2008, 11:01 AM
thanks a bunch!picture is worth a thousand words.thats exactly what i had in mind.engine looks kinda naked there.

Hey Tony, Where and what are the specs on those extra long spark plug cables!?:dunno:

[edit] and looking at my catalogs, the (#61) jet does not come in the jet kits holley offers, you have to buy them individually, Jegs catalog offers #40-100 for Holley main jets.

OilPatch197
02-16-2008, 04:38 PM
BUMP, HEY TONY YA AROUND?:clapping:

Tony Raine
03-03-2008, 01:04 PM
sorry, not around here much. spark plug wires are just a universal set. too lazy to cut them down, but it does make it easier to take off the dist. cap when it gets wet. next set will be cut down, though.

and in the pics i posted, there are still plenty of wires that can be removed. i haven't removed the egr valve yet because i am waiting to find a good chunk of scrap steel to make a block-off plate. i'm not very good at wiring, so i have been taking my time on that.

the holley came with 61 jets from the factory. i had to buy individual sets to get the right mix. too bad those sets in the magazines don't have the smaller sizes, i think mine are 58 or 59.

Tweeder
03-03-2008, 01:33 PM
i had a side-hung Holley 350 on a 2.8L with #53 jets. WAY too damn much carb for that little engine. never once ran right. FWIW, that carb was a stock application on a 302 back in 78. next thing i'm gonna put on it is the Holley 390 4bbl on an Offy manifold. should play a lot nicer at lower revs

Tony Raine
03-03-2008, 01:43 PM
i don't know what a "side hung" carb is, but it sounds like you were running it too lean with 53's. mine runs excellent, and its not a difference in location, because it runs great here in jonesboro. back when i lived in hartman, i even drove it to russelville, which is where you live isn't it tweeder?

Tweeder
03-03-2008, 02:12 PM
side-hung = the pivot for the float is off to the side. as opposed to a center-hung

nope, with #53s it ran rich....to the point that it would become a flame-thrower. you really had to wind it up high to get enough air through the venturi to properly atomize the fuel. when that BII got retired, the 350 went on top of a otherwise stock 302 with the "stock" 61 jets.....works great there and goes like a raped ape clear to redline without showing signs of slacking off.

from that right there tells me i'd want a carb with much smaller primarys on a 2.8L


ps...i live in Cabot, now.

trents
03-06-2008, 02:53 PM
"i haven't removed the egr valve yet because i am waiting to find a good chunk of scrap steel to make a block-off plate."

You can also plug the holes with JB Weld. Stick a cotton ball in the holes first so the JB Weld doesn't run out the back and then after you fill in front of the cotton balls point the snout up in the air until the JB weld sets up.

Tony Raine
03-26-2008, 09:02 AM
found some 1/4". traced the gasket onto it with a dremel (easier to see than a marker). drilled out the holes, and cut it out with a 18V dewalt sawzall, and ground the rest on a bench grinder. finished it off with some hi-temp paint (not in pics).
http://i2.photobucket.com/albums/y46/tony_raine/My%20Bronco%20II/In%20Jonesboro/Engine%20Pics/IMG_0636.jpg

http://i2.photobucket.com/albums/y46/tony_raine/My%20Bronco%20II/In%20Jonesboro/Engine%20Pics/IMG_0637.jpg

http://i2.photobucket.com/albums/y46/tony_raine/My%20Bronco%20II/In%20Jonesboro/Engine%20Pics/IMG_0633.jpg


ps...i live in Cabot, now.

cool, i'll have to give you a yell next time i'm passing through. still got the b2?

jester77
03-30-2008, 06:47 PM
does putting the blockoff plate change anything with the vacuum? I read on another forum (BII.org) that you need to put a different space under the carb ot elimate vacuum leaks?? or a couple gaskets out of some kind of t-bird??

Tony Raine
05-07-2008, 10:54 AM
block off plate doesn't change anything as far as vacuum. the carb spacer is different. i have the right one, just can't remember the part number at the moment. its for a 3.8 t-bird, though.

85_Ranger4x4
05-07-2008, 12:17 PM
block off plate doesn't change anything as far as vacuum. the carb spacer is different. i have the right one, just can't remember the part number at the moment. its for a 3.8 t-bird, though.

Are the throttle bores too small with the stock one? In an attempt to put a Motorcraft 2100 carb on my 2.8 I discovered that the holes are two small. Nobody stocks 2bbl spacers anymore so after 4 hours at the drill press with a rotory file I discovered that the carb was too big to work anyway.

Eric Kropp
05-07-2008, 02:13 PM
I hear Weber makes a bolt on carb for these to with good results. Kind of pricey though.

Eric

85_Ranger4x4
05-07-2008, 03:18 PM
I hear Weber makes a bolt on carb for these to with good results. Kind of pricey though.

Eric

I only tried the 2100 because it came with my 289, and I will be running it on there for awhile once I get it put in. My brother was itching to rebuild it so I let him and just tried it on the 2.8 for grins. It did go down the road better than it ever has, but wouldn't idle for a darn. A new/factory rebuilt carb is way out of my league for this engine, it just isn't worth it for an engine that is almost shot and on its way to a well deserved retirement.