2bbl carb
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Tuned
Joined: Jul 2004
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From: Jersey Shore
2bbl carb
Since the gas is going to make me take out a 2nd mortgage on my house, I think I need to get rid of the offy dp n holley setup. Which setyup would you think would be the best to do, 1. putting back the 1 bbl w/o all of the emissions stuff? 2. If seen clifford has a 2bbl adapter for the original manifold, but I was wondering if Ill be gaining any gas mileage back going to a 2bbl? I need to do somthing, everyother day the price are goin up $0.20 and thats just crazy. So let me know what you think of these two setups. mind you I have 82 bronco w/3.70 gears and 33" and a 6" lift.
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Joined: May 2002
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From: Fraziers Bottom, WV
Installing my Offy "C" and Holly 390 took my mpg from 14.5 to 16 MPG. The old 1bbl was not that good on fuel! I would keep the offy setup and after I got over the new 4bbl and keep my foot out off the floor it is great!
P.S. drop the big tires and go back to the OEM size and the MPG will come back! No carb will do well with 33" tires.
P.S. drop the big tires and go back to the OEM size and the MPG will come back! No carb will do well with 33" tires.
Last edited by 5_labsownus; Sep 1, 2005 at 10:16 AM.
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Joined: Apr 2004
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I also don't think the one barrel will solve any problems. I just rebuilt my 1 barrel 1&1/2 ago. It was good for about 6 months, ran danm good and got 13-15+ mpg. But today it starts way hard and I would be lucky to get 10 mpg. My 4 barrel is in the mail and I ain't scared and gas here is 3.00/gal+. but just in case I also have a 4 cyl. ranger
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Joined: Apr 2004
Posts: 1,127
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From: Lewistown, PA
The 1bbl. carbs are a gas wasting PIG.
Try to modify your driving habbits. Don't accelerate quickly.
Keep the engine well tuned.
Some say electric fans help.
Keep the tires inflated properly.
M/T tires eat more gas than A/T tires
Wide tires eat more gas than narrow tires
Properly gear the truck to keep cruising RPM's at or near tourqe peak.
Try to modify your driving habbits. Don't accelerate quickly.
Keep the engine well tuned.
Some say electric fans help.
Keep the tires inflated properly.
M/T tires eat more gas than A/T tires
Wide tires eat more gas than narrow tires
Properly gear the truck to keep cruising RPM's at or near tourqe peak.
Thread Starter
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Tuned
Joined: Jul 2004
Posts: 321
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From: Jersey Shore
So it doesn't matter whether its a 1,2,or 4bbl is what your telling me? Cause I see I could use a clifford adapter to utilize a 2bbl carb on the stock manifold. See the other prob that im having is that it takes the truck at least 5 mins. to warm up and that only at 65* outside, winter is coming and im not sure what i can do to warm her up faster. Also, it still hesitats when I get on the gas through everygear. It becomes an actually bucking bronco. What should I do?
Posting Guru
Joined: Apr 2004
Posts: 1,127
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From: Lewistown, PA
Do you have a heat riser on your air cleaner?
Open element air cleaners are not as good as most people seem to
think. It takes longer to warm up because you are pulling in cold air, and when the engine warms up, it pulls in hot air from the engine-not good.
The hesitation sounds like it is either carbon build-up, faulty ignition components, timing, or an improperly tune carb. Maybe a combination of these. One can lead to another.
Open element air cleaners are not as good as most people seem to
think. It takes longer to warm up because you are pulling in cold air, and when the engine warms up, it pulls in hot air from the engine-not good.
The hesitation sounds like it is either carbon build-up, faulty ignition components, timing, or an improperly tune carb. Maybe a combination of these. One can lead to another.
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Tuned
Joined: Jul 2004
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From: Jersey Shore
No i do not have a hear riser. How do they function, where do they go, and how do I get me one of them?
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Posting Guru
Joined: Apr 2004
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From: Lewistown, PA
How do they function?
During warm up, exhaust gas leaves the exhoust manifold via a duct to the underside of the air cleaner snout. On the snout there is a valve that opens and shuts dependinding on the air temp. During the warm up, this valve shuts(?) blocking outside airflow from the airbox. Once the temp rises, the valve opens(?), blocking the exhaust and allowing cool, fresh air from the airbox. Most people deem this setup unnecessary and rip off to put on chrome open element air cleaners.
Where do they go?
Between the exhaust manifold and the underside of the air cleaner snout.
Where to I get one?
The junk yard should be full of them. Often one may have to replace the valve and the heat duct. The duct becomes brittle over time from heat and the elements an falls apart. Best bet would be to get a set up off an old carbed 300 truck.
I plan on installing EFI exhaust manifolds on my carbbed 300.
The rear manifold has a tapped hole in it for what was propbably an EGR valve.(?)
I plan on using this as a source of exhaust heat to help with cold weather start up.
During warm up, exhaust gas leaves the exhoust manifold via a duct to the underside of the air cleaner snout. On the snout there is a valve that opens and shuts dependinding on the air temp. During the warm up, this valve shuts(?) blocking outside airflow from the airbox. Once the temp rises, the valve opens(?), blocking the exhaust and allowing cool, fresh air from the airbox. Most people deem this setup unnecessary and rip off to put on chrome open element air cleaners.
Where do they go?
Between the exhaust manifold and the underside of the air cleaner snout.
Where to I get one?
The junk yard should be full of them. Often one may have to replace the valve and the heat duct. The duct becomes brittle over time from heat and the elements an falls apart. Best bet would be to get a set up off an old carbed 300 truck.
I plan on installing EFI exhaust manifolds on my carbbed 300.
The rear manifold has a tapped hole in it for what was propbably an EGR valve.(?)
I plan on using this as a source of exhaust heat to help with cold weather start up.
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Elder User
Joined: Sep 2003
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I run a heated Clifford mainfold with a 2 bbl adaptor and a Motorcraft 2150 2V carb with #50 jets. This works great on my stock 300. I also have the EFI w/ walker y-pipe and a 2.5" exhaust out the back. I also run the GM-HEI combo ignition.
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Tuned
Joined: Jul 2004
Posts: 321
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From: Jersey Shore
well ya see the offy dp has 2 holes through the intake that i believe are for the water hot water tubes. However the hoses that are in my rig are way to big to slide into the manifold. Could it work if I made them go to a metal pipe then back to the tubing?