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1 Barrel Carbs and Fuel Economy?
https://slantsix.org/forum/viewtopic.php?t=53584		 Page 1 of 1
Author:  kxracer728 [ Mon Oct 14, 2013 8:01 am ]
Post subject:  1 Barrel Carbs and Fuel Economy?
I was wondering out of the holley 1920, 1945, carter BBS which carb is better for fuel economy?

I'm using the 1920 right now but it looks like i'm only getting 12 to 14 MPG. Which with a truck and the /6 i'm sure 16 city and 18 hwy are the most you could get. I know some things with my setup right now doesn't lend itself to better fuel economy! I'll work towards that overtime

I got a good deal on a rebuilt holley 1945, 8452 It is crossed to Tomco rebuilt # 1-412 that was used on 1979-1982 Chrysler cars...later on i'll try it out and see how it performs

Is anybody running this carb and what are your thoughts? And will this carb work OK with a intake manifold off a 72' dart swinger?

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Author:  Aggressive Ted [ Mon Oct 14, 2013 2:39 pm ]
Post subject: 
Ran a 1945 for 5 years.......and was not happy. Tore it apart too many times trying to get it to work well. I even tried #60 jets, #61's on up to #64's.

Found a unique version of the Holley 1920 which is different from the stock units called an "Economaster" built 1968 to 1972 for taxi cabs and I love it. great throttle response and awesome mileage and it has a super good valve with dual plungers.
Author:  Reed [ Mon Oct 14, 2013 2:57 pm ]
Post subject: 
The 1920 Economaster is the top of the heap for economy one barrels. It has more finely controlled metering as well as a venturi booster that provides a better vacuum signal to the carb. The economaster line had two and four barrel carbs as well, and if you have a choice you should always pick the economaster (provided it is in good condition).
Author:  kxracer728 [ Mon Oct 14, 2013 5:19 pm ]
Post subject: 
Quote:
Found a unique version of the Holley 1920 which is different from the stock units called an "Economaster" built 1968 to 1972 for taxi cabs and I love it.
Do you know what model #'s are "Economaster"? Or is there anything on the carb to tell you it's and economaster?

The #'s on my current holley 1920 are 6260 2 1267 supposedly it came off a 72' dart swinger but who really knows i guess...
Quote:
great throttle response and awesome mileage and it has a super good valve with dual plungers.
Are you talking about the power valves?
Author:  DusterIdiot [ Mon Oct 14, 2013 5:29 pm ]
Post subject:  Booster
Quote:
Do you know what model #'s are "Economaster"? Or is there anything on the carb to tell you it's and economaster?
The economaster 1920's did not have the weathervane venturi in the carb throat, but had a wagon wheel booster instead (round with "spokes"), Holley made a series of 2300's this way but most were smog replacements and had reverse idle screws so are not the best for retrofitting another engine.

That being said, if the carb is calibrated for the build correctly it should provide good mileage all things considered. Technically the Feather Duster/Dart Lite Holley 1945 is a non-economaster but was able to put down about 30-32 mpg on the average (power and acceleration suffered), but was calibrated for the gross amount of timing, massive EGR to knock the pinging back, and the luggy rear gear ratio when in OD...

-D.Idiot
Author:  kxracer728 [ Tue Oct 15, 2013 9:36 am ]
Post subject: 
Quote:
Technically the Feather Duster/Dart Lite Holley 1945 is a non-economaster but was able to put down about 30-32 mpg on the average (power and acceleration suffered)
WOW! that's hard for me to believe that a /6 could get that kind of gas milage...

I've looked at some pic's of the economaster and saw the wagon wheel booster inside the barrel so i will know how to identify them. If i where to buy another 1920 it would definitely be an economaster!

Right now, i'm not running EGR but i feel like that probably does help with MPG on around town driving. My base timing is set at 12 BTDC it seems with my slant between 8 and 12 are acceptable...
Author:  Aggressive Ted [ Sat Oct 19, 2013 9:53 am ]
Post subject:  1920 Economaster
Quote:
Post subject: (Mon Oct 14, 2013 5:19 pm) Reply with quote
Quote:
Found a unique version of the Holley 1920 which is different from the stock units called an "Economaster" built 1968 to 1972 for taxi cabs and I love it.


Do you know what model #'s are "Economaster"? Or is there anything on the carb to tell you it's and economaster?
Yes, you can look at the pictures by clicking on the red link below my name. Look at the font of the carb for the part number. I did one shot close up so you know where to look. The stock Economaster is R7585 and comes with a #552 jet. I prefer a #57, but have had excellent results with a #56 jet.

There is one for sale on eBay right now!

Quote:
Are you talking about the power valves?
Yes! It is dual two stage plunger. One kicks in first for light duty and press a little more for both! They will really get both tires spinning with 12 to 16 degrees initial advance.
Author:  Xproject187 [ Wed Jan 08, 2014 8:19 am ]
Post subject: 
Very interesting thread.
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