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BigRedTruck
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types of carburators
I'm looking at getting my truck more fuel efficient while it is in the shop getting tuned. they said something about a part being 2 or 4...I think they were feeds into the engine. supposedly a carb with 2 instead of 4 gives you more milage. I have no Idea what they are talking about and was wondering which type a 69 360ci would have and if switching causes more wear,strain or anything negative like that. also If you have a any other ideas on improving milage that would be great because i'm looking at a daily commute of 26 miles in each direction.
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69 F100 360ci
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6/8/2004, 3:52 pm
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6772FordFseries
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Re: types of carburators
They were referring to the carburetor. A carb can either come as a 2-barrel or a 4-barrel. Each barrel (or venturi) feeds fuel into the engine, and as you should know, the more fuel you can cram into an engine, the more power it will make. Of course, as power goes up, mileage goes down....and vice versa. The best you can do is to try to find a medium ground with decent power AND decent mileage, but that's kinda the Holy Grail.
360s came stock with a 2-barrel carb, so unless a previous owner has swapped it out for a bigger 4-barrel, that's what you should have. A 2-barrel is better for mileage, since less fuel is getting fed into the engine, a 4-barrel is better for power, since the extra fuel will increase horsepower.
There are many things you can do to increase mileage, but keep in mind that not only will your power probably decrease a bit, it won't be necessarily cheap and you'll probably never get it down as low as a small block, for example. One of the big culprits on our trucks is the steep rearend gears. These trucks were made for low-end grunt and the rearend gear ratios reflect this, but because of it, the mileage pretty much sucks on the highway, because the engine is turning at higher RPMs. Putting numerically-lower rearend gears into your truck will definitely help the highway mileage since your engine RPMs will be lower, but it won't seem as strong, power-wise. Your take-off will suffer just a bit.
A good flowing dual exhaust system with headers and high-flow mufflers will allow the engine to breath a little easier and mileage will go up a tad. Other smaller things might help out include making sure your tires are properly inflated (since under-inflated tires cause rolling resistance), making sure the engine is in good basic tune (spark plugs/wires, carb, etc.) and using a smaller rear view mirror as opposed to large West Coast style mirrors, which tend to act as a sail on the highway. If your truck doesn't have a topper (canopy) on it, dropping the tailgate while on the highway will help a bit, since it too tends to act like a sail.
Hope this helps some. Good luck!
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Keith
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6/8/2004, 4:47 pm
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willowbilly3
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Re: types of carburators
Also you might install a vacuum guage and always try to drive with it reading as high as possible as that is a basic reflection of fuel comsumption. There were actually cars back in the 60s that came with them and just used colored zones instead of numbers and called them things like economy meters.
Skinney tires will get better milage than fat ones too. Make sure your front end alignment is correct and that no brakes are dragging.
There is some contoversy over thermostats as the cooler ones will often produce more peak horsepower but at the same time a hotter one will make your engine run more efficient, especially in cooler weather. I wouldn't go cooler than 180-190 degrees and up north I used to run a 205 on my 300-6 year round. I picked up about 1 1/2 mpg city when I changed from a 180 to a 205 in the winter.
If you can find a shop with a 4 gas analyzer and can afford to spend a few bucks, they can tell you if your engine is running efficiently and you may be able to have it fine tuned to help some. First you should have a compression test and determine if your engine is tunable or not.
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I'm a lumberjack and I'm OK, I sleep all night and I work all day
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6/9/2004, 2:09 am
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TheImpaler
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Re: types of carburators
I've always heard that a "properly tuned" 4 barrel will yield better mileage than a 2 barrel - especially an old, worn 2 barrel.
Thoughts?
-Patrick
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6/9/2004, 3:37 pm
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6772FordFseries
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Re: types of carburators
Yes, actually I believe that's right...in theory. I mean, the primaries of a four-barrel are normally smaller in diameter than the two on the two-barrel, meaning that slightly less fuel is being fed into the engine at lower RPMs. It's only when you romp on it and get the 4-barrel's secondaries opened up that your mileage actually goes to pot.
I've actually heard of some people who have wired their secondaries shut, to prevent them from opening at all, basically converting their carb into a small 2-barrel...
...but what's the fun of having a four-barrel and not USING it?? 
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Keith
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6/9/2004, 4:34 pm
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BigRedTruck
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Re: types of carburators
That explains a lot...as far as getting a different a carb...a different two barrel would not help? I have seen these Holley things everywhere and they are supposedly performance models. But, that would mean less fuel efficiency because the fuel volume is increased for more power? Another little bit...really does not belong here but there would just be too many threads for simple questions. Style side, flare side, fleet side...no clue. I my truck has that metal trim on it and I have seen some f-100's without it. I was wondering if the 69 models were offered without the metal trim and if I could take mine off and have it look like one of the other models. I like the smoother look and well. a new trim set cost around 500 bucks...sorry for all the trouble I’m still a bit new at all of this and am just started to understand the basics of motor vehicle mechanics. and what is a Cleveland engine the other ones who are named after towns and have entire books devoted to them? How can I tell.the metal plate on the engine is corroded/unreadable. Thanks for the help
Last edited by BigRedTruck, 6/11/2004, 12:03 am
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69 F100 360ci
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6/10/2004, 11:15 pm
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willowbilly3
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Re: types of carburators
There was several different trim levels and combinations of side trim. If you remove yours there will be holes to fill where the clips were. Step side is a truck with the fenders on the outside of the bed and a step between the fender and cab. Style side is Ford's name for the style with the fender wells on the inside of the bed and the whole bed basically the same width as the cab and matching the bodylines of the cab. The majority of pickups are style side. Fleetside was what Chevy called the same thing.
The confusing array of city names that Ford has on engines derived from the city that the plant was in that manufactured them. I think it started when they introduced two completetly different 351 cubic inch engines. At that time the one made in Cleveland with the 4 barrel carb was the hottest on so it was always desireable to have a Clevland. These were last made around 1973-74. The other 351 was the Windsor which shares the same basic design of the 289-302 small block. These are the same 351 ( 5.8 liter) that remained in production through 97 in the trucks. If you post the info off your door tag here we can tell what engine your truck came with. I see in your signature line you list a 68 260. A 360 would have be the available V8 in 69 and also the 390. These engines are what is called the FE engine family and they both look identical with no external details to help distinguish one from the other. Both engines even have the same bore and the same block. The crankshaft stroke is basically where the difference lies and you can make a 360 into a 390 with the crankshaft, rods and pistons. Many 360s have been represented as 390s. The easiest way to tell an FE is to look where the intake manifold meets the head. That conjuncture is actually under the valve cover.
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I'm a lumberjack and I'm OK, I sleep all night and I work all day
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6/11/2004, 12:54 am
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NM5K
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Re: types of carburators
There were actually cars back in the 60s that came with them and just used colored zones instead of numbers and called them things like economy meters. >>>>>>>>>
They stuck those on pontiacs quite a bit in the 60's...Usually the sportier models...If that makes much sense...:/ I had a 66 bonneville land monster once, but it didn't have one...That car had a nice interior though...Was in perfect shape on the inside. Always liked pontiac interiors with the wood paneling and neat gauges they often used. Had a 389...With all that weight, it needed it...Maybe the biggest 4 door sedan I ever had in sheer length and wheelbase...And it had those long lost things called fender skirts...Never see those any more..Once had a 73 coupe deville for a while. It wore skirts also..That pontiac was just as big I think..MK
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1968 F-250 / 300 six / T-18
Dana 60 - 4.10 Limited Slip
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6/11/2004, 2:22 am
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BigRedTruck
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Re: types of carburators
vin is f10yde90842 all I fugured out from that is that it is a f100 and has a 360
131 2 f100 7 81 g 17
05000 175 4000 612290
the rest of that info I had trouble understanding because it is out of place in relation to the example in the owner's manual.
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69 F100 360ci
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6/11/2004, 8:07 pm
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6772FordFseries
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Re: types of carburators
quote:
BigRedTruck wrote: ... Another little bit...really does not belong here but there would just be too many threads for simple questions....
Actually, individual threads are probably better, since they'll be easier to find. When good information is presented in the Engines forum about outer stainless steel body trim, it makes it next to impossible to find for someone looking for it a few weeks or months down the road.
But to answer this question...at the top of this page are links to the VIN deciphering pages. Click on your year (1969) and then just compare the codes with what's on your VIN tag.
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Keith
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6/11/2004, 10:19 pm
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