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Old 03-31-2008, 08:33 PM
willigiggin willigiggin is offline
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460 with holley 4180C

I have a 34', 1989 Georgie Boy RV, the gas milege is awful 5 or less miles per gal.

Does anyone have a suggestion on modifications to the carburation system that might make a difference.

Is there anything to be gained in stripping all of the polution controls from this unit and replacing the carb.

I've tried with no success to tune the unit as it is but it's been like this
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Old 03-31-2008, 09:14 PM
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Replace it with an different Holley. The 4180 is made by Holley to Ford specs and is an emissions carb and there isn't much you can do to it. I replaced the 4180 on my 1984 460, C-6 and 4.10 rearend in a F-250 crew cab, super duty (light 1 ton). Stock 6 to 7.5 mpg was the best I ever got. After the install of a Holley 1850S with a 2 stage power valve and reworked vacuum secondary spring, later opening. It added just over 1 mpg. I recurved the dist, to 35° mechanical advance in at 3500 rpm and with vacuum advance 50° total. The mpg is right at 10 mpg. The exhaust is both head pipes dump into a single 3" pipe, muffler and tail pipe. Other than going to headers it as good as it is gonna get.
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Old 03-31-2008, 10:05 PM
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Quote:
Originally Posted by Bear 45/70 View Post
Replace it with an different Holley. The 4180 is made by Holley to Ford specs and is an emissions carb and there isn't much you can do to it. I replaced the 4180 on my 1984 460, C-6 and 4.10 rearend in a F-250 crew cab, super duty (light 1 ton). Stock 6 to 7.5 mpg was the best I ever got. After the install of a Holley 1850S with a 2 stage power valve and reworked vacuum secondary spring, later opening. It added just over 1 mpg. I recurved the dist, to 35° mechanical advance in at 3500 rpm and with vacuum advance 50° total. The mpg is right at 10 mpg. The exhaust is both head pipes dump into a single 3" pipe, muffler and tail pipe. Other than going to headers it as good as it is gonna get.
It's all about making as much torque as possible and then not using it . Might try advancing the cam if you have that nasty retarded chain...
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Old 04-02-2008, 01:11 AM
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I have a 88 Georgie Boy witht the same set up. I replaced the timing set-up, an RV cam and had higher gears put in the rear end and I increased my mileage 20%...It increased from 5 MPG to 6 MPG (that's a 20% increase)...But I drive it 65 + mph too.
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Old 04-02-2008, 02:35 AM
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The best mileage tactic is to flat slow down. I quit the 60 - 65 mph stuff and now run about 55 and gained 1 mpg just from that even with 4 quads on a double axle trailer behind the truck.
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Old 04-02-2008, 05:33 AM
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Great stuff guys....I'm in snow country Canada so it's in storage right now but this gives me something to work with and I have some time to source out a carb. Bear do you know, is there much difference between an 1850s and the 4160 series Holley.

Yes I must say I push it pretty hard, not under 65 on a good highway, probably a good to slowdown even for safety.
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Old 04-02-2008, 10:07 AM
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The 1850 is a 4160 carb. 4150, 4160, 4180 and 2300 are series of carbs. List numbes such as 1850 or 1850S are the actually numer of a carb. The difference between a 4150 and a 4160 is that the 4150 has a full size metering block, with regular jets while the 4160 uses a metering plate for jetting. The 4180 is an emissions modified, for Ford specifically, 4160 carb.

Here's a list of all Holley carbs by list number and the parts they use:

http://www.holley.com/data/TechServi...%20Listing.pdf

This page has much info need by by the Holleycarb use who is gonna work on it.

Holley Performance Products Technical Library

The whole site is very informative.

Holley Performance Carburetors, Fuel Injection, and Fuel Pumps
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Old 01-22-2013, 03:31 AM
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F350/ 460 W/ holley 4180

I have a F350 W/460 & a Holley 4180 carb. I normally dont like Holley carbs, but since it came on the truck I'll try and work with it. I get terrible mileage, 3 maybe 4 mile to the gallon. Ive been looking at other Holley carbs on
http://www.holley.com/data/TechServi...%20Listing.pdf but it doesn't say which carbs are California emission control legal. My 85 F350 is Catalytic exempt. Ive looked at the 1850 & 4150 carbs but really have no idea what to look for. I have a neighbor down the street that has a stock 88 F350 W/460 & a Holley 4 barrel carb, it has a 10 ft utility bed & rack and gets between 10 & 12 mile to the gallon. Don't see any numbers on the carb but the carb looks physically smaller. My truck is used exclusively around town, 15 - 45 MPH, one in a while on the freeway. Ive owned the truck since Aug.2012 & it hasn't been on the freeway yet. Any ideas as to other carbs. Thanks
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Old 01-22-2013, 05:08 AM
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"other" carbs that are California legal???

With that mileage you probably have a blown power valve.
Have you considered rebuilding your existing -legal- carburetor?
It takes the Holley 3-1346 kit.

I replaced my worn out 4180 with a 0-80457s (electric choke 4160)
It works well and fits, other than having to change some fittings and connections, and swap over the single lead Motorcraft choke cap.
But it doesn't have evaporative emissions control vented float bowls.
I'm emissions exempt here.

I don't think anything but original equipment is legal in California.
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Old 01-22-2013, 05:08 AM
 
 
 
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1850, 1983, 3, 4150, 4180, 4180c, 460, carburetor, carburetors, emissions, ford, gallon, holley, holleycarb, miles, source, vacuum

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