Carburettor selection
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Carburettor selection
I wanted to change my 351 Windsor F250 from EFI to a carby I have bought a 7181 Edelbrock Inlet manifold and wanted to buy an Edelbrock Carby.
I have been trying to work out which is the right model carby to select any Ideas?
I have been trying to work out which is the right model carby to select any Ideas?
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Bigger isn't better.
probably a 600 cm .
Look at what size stock carb was on a 86 or so.
Probably 600 to 650.
A too large of carb is hard to tune.
Plus you lose usable power
I had a edy 600 on a Windsor in a f350 ran good.
smaller carb gains torque.
Larger gains top end
probably a 600 cm .
Look at what size stock carb was on a 86 or so.
Probably 600 to 650.
A too large of carb is hard to tune.
Plus you lose usable power
I had a edy 600 on a Windsor in a f350 ran good.
smaller carb gains torque.
Larger gains top end
Post Fiend
Joined: Apr 2002
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From: Waterloo, Iowa
Too small for what, is the question. What are your plans or how is the truck to be used?
A smaller carburetor will most definitely run out of steam at some point at the high end or high speed high RPM. I doubt you'd notice in most situations. An oversized carburetor will tend to be harder to tune and not idle well or respond crisply in high load or low speed just off idle acceleration. That's why big trucks always had small carburetors.
High velocity though the venturi atomizes fuel droplets best. If you aren't spooling up to 5,000 regularly around town a huge carburetor is probably a poor choice. Depending on what you want out of your truck, a smaller or larger carburetor will make a big difference. Selecting the wrong size carburetor and then trying to make it work is a pretty classic tuning error.
A smaller carburetor will most definitely run out of steam at some point at the high end or high speed high RPM. I doubt you'd notice in most situations. An oversized carburetor will tend to be harder to tune and not idle well or respond crisply in high load or low speed just off idle acceleration. That's why big trucks always had small carburetors.
High velocity though the venturi atomizes fuel droplets best. If you aren't spooling up to 5,000 regularly around town a huge carburetor is probably a poor choice. Depending on what you want out of your truck, a smaller or larger carburetor will make a big difference. Selecting the wrong size carburetor and then trying to make it work is a pretty classic tuning error.
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I use the ute for general driving, getting firewood, tip runs. Not trying to beat the land speed record or anything like that. It is used as a semi farm truck.
I want to ensure I still have the power to pull and tow as well as improve fuel consumption if possible. I have had the ute for about 6 months and I don`t think I have pushed her over 3750rpm.
I want to ensure I still have the power to pull and tow as well as improve fuel consumption if possible. I have had the ute for about 6 months and I don`t think I have pushed her over 3750rpm.
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Then I would have the 2bbl rebuilt or replaced.
why all the time and expence of a 4bbl if that's all you need.
the 2bbl may not be as fast as the 4bbl.
but they make a good torque curve.
For a truck to use for working I'd prefer a 2bbl.
Fuel mileage should be better with a 2bbl.
Unless. You mash it to the floor all the time.
why all the time and expence of a 4bbl if that's all you need.
the 2bbl may not be as fast as the 4bbl.
but they make a good torque curve.
For a truck to use for working I'd prefer a 2bbl.
Fuel mileage should be better with a 2bbl.
Unless. You mash it to the floor all the time.
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Joined: Aug 2010
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From: Chillicothe
The big thing is what transmission do you have? If you have an overdrive automatic you will need a standalone transmission controller.
Other than that, my favorite carb is a good old quadrajet. But the manifold would need an adapter so unless you want to do that. I would next go with a 500 vacuum secondary carb. The small factory cam and factory heads wont flow enough to need much more than that.
Other than that, my favorite carb is a good old quadrajet. But the manifold would need an adapter so unless you want to do that. I would next go with a 500 vacuum secondary carb. The small factory cam and factory heads wont flow enough to need much more than that.
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Why? What year is the truck and what trans does it have? And what fuel milage does it get now? If this is a '90s truck it will most likely have a computer controlled trans.. unless it's a manual. A truck this age could now have deteriorated wiring and/or a failing PCM which would make maintaining the EFI system difficult, but a carb conversion involves replacing all of the intake, fuel and ignition systems and figuring out some wiring for the dash gauges so it's not exactly a simple task either. In fact it would be a lot easier to replace the PCM and fix the existing wiring if necessary to get the EFI system back in top operating condition. Fuel milage achieved will depend more on the size and weight of the vehicle and how it is used, the larger versions of these HD trucks running around town with a load in them won't ever do better than 8-12mpg no matter what the powertrain is, that is just physics at work. The state of tune of the engine could be the difference between 8mpg or 12mpg but that is about it, you will never see 18+ from one of these big old truck in case that is what you were thinking.
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