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Cj3b Gasmilage; CJ3B Gasmilage
Topic Started: Aug 7 2009, 08:07 PM (2,406 Views)
our53cj
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I'm new to the site but my father and I are just cresting the hill on a frame up restoration of our 1953 CJ3B. My question is... What type of gas mileage can I expect to get out of my 3B? It doesn't have an over drive. It does have a rebuilt 134 F head engine and all other running gear has been rebuilt. Can any of you guys help?

Thanks guys.
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yjcanibul
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hi our53cj,


I found these numbers awhile back, my guess is about 18 mpg which is pretty good

maybe some of the daily drivers on here can confirm or give some real world #'s

I base the 18 on whats published for the m606 3B below, it holds 10.5 gallons and has a cruise range of 175 miles, thats about 16.5 mpg but the m606 is about 10% heavier so the lighter 3B would be 16.5 x 1.1 = about 18 mpg

http://www.film.queensu.ca/cj3B/Photos/Mil...606Brochure.JPG
57 3B : big speedo / Hurricane / YF 938 SD / IAY-4012 / T90 / D18 / 5.375 final drive / open diffs / Firestone 6ply Military NDCC / 12v Delco SI alt / Kayline Top / venting windshield / tub patched / "still fixing leaks one at a time"

89 wrangler : h/duty axles + 5spd / 200+hp 4.2L / arb locked / multiport fuel inj / warn hubs+winch / 1/4 mil km / fishing+trail riding / gets me to work
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1954cj3b
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134fhead with 33s no overdrive prob around 12mpg

mine on other hand will get around 22mpg with the 4.3 fuel injection motor
and sm420 trans soon as it goes in

but the 10 gal tank will kill me lol :rolleyes:
3b'ers do it on all 4's
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our53cj
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Thanks for the input. I plan on 31x9.5's on the rims now but would like to get a set of stock rims and 600x 6 NDT's for car shows.

Still would like some real world mileage from guys who drive theirs daily.
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donk
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I get around 16 mpg. Gas gauge doesn't work. A while back, I made the turn into my driveway and I coast to a stop. After checking wires, battery and wondering why she won't run, I finally figured out the obvious, so I carry a gas can behind the seat just in case.

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1953 CJ3B/Hurricane F-134/
Bantam TC-3 trailer

Hampden,MA
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OZ-JEEP
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While my setup is not the same as yours I get 20.5 MPG with 225V-6 ,T-86 ,4.27:1 axles sporting 33" tires. This is when driving conservitively, if I get my foot on the throttle alot it drops to around 16 MPG.
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O.G. "OZ" Findley
1954 CJ-3B
1970 Jeepster/Commando
Michigan
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COPPERSWILLY
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I get 20 mph out of my jeep. Original motor with spring over and 33x12.50 tires. I found this out by filling my tank driving my jeep to work which is 5 miles on the dot then going home then back to work then home again and refilling the tank...it took 1.3 gallons...I was shocked a little but very happy. I had my carb rebuilt and tuned by a master carb man and he told me that my mpg would improve. The guy was right
Chris .... MD
54 cj3b OIIIIIO
62 cj3b OIIIIIO
74 cj5. OllllllO
49 Bantam TC3
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our53cj
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Thanks for the help. Figured I should show a picture of what this info was for.

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OZ-JEEP
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Thats a real nice looking Jeep! I like that color green and I see you have a back seat too.

I clocked my milage by filling up and then took a long cruise of known length and then filled back up again to do the calculation. I never recalibrated my speedometer for the 33" tires and the axle gear change so I knew that I wouldn't be able to use the odometer to track the miles to do the calculation.
O.G. "OZ" Findley
1954 CJ-3B
1970 Jeepster/Commando
Michigan
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Larry (TX)
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our53cj,

Congrats on a VERY nice restoration you two have done on the 3B as it appears it's about as a professional job as can be. I too like the dark green paint trimmed with black accessories, and the seat covers are exceptionally good looking and probably very comfortable as well.

Tell us your name (first will do if you don't want your last name posted) and what part of the country you're located in.

Regarding mileage, I'm sorry that I can't give you any figures as I've never once calculated that on my '53. I fortunately have an accurate reading gauge and when I see it at or near 1/4 remaining, I simply fill up the tank. Having run out of gas on many occasions when I first started collecting these little flatfender jeeps back in the 60's, I too usually carry a five gallon jerry can of spare gas.

Please post more photos when you complete the project, (most all of us enjoy looking at other's 3B's).

Larry S.
Larry Steed
Pearland, Texas
'53 Willys CJ3B
'52 Willys M38
'86 Chevy M1009 CUCV (K5 4x4 Military Blazer)
M100 1/4 ton jeep trailer
M416 1/4 ton jeep trailer (2 ea.)
M101 CDN 1/4 ton jeep trailer
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HOGHEAD
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I to like the dark green & as mine is not done yet I cant give you any MPGs ,, But your 3b is very nice,, I only wish mine will look as good,, The black sets it off .. ;)
Dargan Md...
Death Before 2 Wheel Drive...
"On a Steel Horse I ride"
AMC Rules.
"Journey" not the Destination...
59 Cj3-b (married to a 74 Cj-5 frame & AMC running gear)
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Willys Overland,,

My Build http://z4.invisionfree.com/CJ3B_Bulletin_B...?showtopic=2892
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oldtime
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our53cj,
Welcome to the CJ3B PAGE B.B.
I suppose it is obvious what I think about a dark green CJ-3B....
Here's my old 53 currently going for its second ground up 100% rebuild. http://www.film.queensu.ca/CJ3B/Photos/Fin...shdiecker3B.JPG

As you know fuel consumption is a variable thing with a multitude of factors to consider.
For a basic example; the wide track and heavy tire / wheel combinations will readily effect the jeeps fuel consumption.

I have run various CJ model jeeps extensively as daily drivers.
But I have not operated the model 18 transfer case since 1984 without the Warn Overdrive.
My 1953 will average around 18 mpg on the big roads when cruising 55 to 60 mph.

That jeep was set up as follows...
Stock/ standard F-134 bored 30 over.
6.9 ratio head compression
"Hillbilly tuned" Autolite IAY- 4041
Carter 938 SD
Standard exhaust system
8.5 Auburn Clutch
Borg Warner T-90 A
Warn 25% overdrive
5.375 final drive
6 ply 6.00 X 16 NDT's on standard rims
Optional front disengaging hubs

When the engine crankshaft velocity raises above 3000 rpm the power generation becomes overmatched.
Also the wind drag co-efficient increases substantially around 55 to 60 mph.
So between the crankshaft velocity and the disproportionate increase of air disturbance the fuel mileage really starts to suffer after 55 to 60 mph.

I believe a reversable modified CJ-3B is capable up to 20 mpg.
A radical modified (engine transplant) would probably get around 24 mpg max.

EDIT: numbers have been lowered to reflect todays fuel
Currently building my final F-134 powered 3B .
Rock Crawler using factory parts from the Willys Motors era (1953-1963)

http://s4.zetaboards.com/CJ3B_Bulletin_Board/topic/30228766/1/#new
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our53cj
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I imagine the front disengaging hubs would help with MPG. Thought about putting them on but I like the looks with out and the idea of just having to pull it into 4 wheel drive when I need it . I hated having to turn the lockers when I needed four wheels on my old Ford.

My name is by Krist by the way.
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Dougie
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A trick I learned in my VW bus with the non-functioning gas gauge was to fill up the tank every 200 miles. At 25 mpg and a 10 gallon tank, that left some reserve. It's easy to watch the odometer.

Obviously when in low range the mileage is going to be a lot worse...
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jenks54
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Krist,

Is that a Whitco top? If not, can you tell me what it is?

Thanks!
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