Jeepster Engines

1948 :INTRODUCED MAY 3 1948  4 CYL 63 HP L-HEAD ENGINE

1949 :MODEL 463 JEEPSTER REPLACED BY VJ-3 JEEPSTER ON JANUARY 10, 1949. AVAILABLE INCLUDED 134/L-4 (SAME AS 48) OR 148/L6.
 

1950 : OCTOBER 1949 TO MARCH 30, 1950 NO CHANGES FROM PREVIOUS YEAR MODEL. (SO A 1950 COULD BE A FLAT NOSE OR A V NOSE)
 

1950 BEGINNING APRIL MAJOR STYLING CHANGES (V NOSE) 4 CYL F/HEAD 134CU 72 HP ENGINE OR 6 CYL L/HEAD 161CU 90 HP WAS OFFERED..
 

1948 BODY STYLE=4 CYL L-HEAD
1949 BODY STYLE=4 CYL L-HEAD OR 6 CYL L-HEAD 148 CUBIC INCH
1950 BODY STYLE=4 CYL F-HEAD OR 6 CYL L-HEAD 161 CUBIC INCH
 

Information provided by Cliff Wepf

From the book Collector's Library, Jeep by Jim Allen, page 224:
 "Called the "Lightning 6," the 161 cid 75 hp flathead (L-head) 6-cylinder was available. On L-161 the engine number was located on a boss on the upper front of the passenger side of the engine block. Beginning engine number was 2S10001 and continued consecutively, regardless of model year."

4 Cylinder L-Head Engine 4-63

6 Cylinder L-Head Engine 6-63 engine

F-Head - 4 Cylinder - end sectional view

Pictures from Willys-Overland Mechanics Manual

standard of Jeep since its production runs was the L-Head engine. because of its valve configuration,  The following are its specifications. Used in the MB,GPW,CJ2A,CJ3A and Early trucks and wagons. From about 1947 until 1955, the slightly modified L-Head was used in the Pickup and Wagons. It had a different carburetor (Carter 626 1 barrel) and has an improved compression ratio*.

L-Head 134 4 Cylinder
Bore x Stroke
3.125" x 4.375"
Displacement
134.2 ci(2.2L)
Compression Ratio
6.48:1
Horsepower (gross)
60@4000rpm
Torque (gross)
105@2000
Main Bearings
3
Valve Configuration
L-head
Fuel
Carter WO-596S 1bbl downdraft

* L-Head 134 4 Cylinder
Bore x Stroke
3.125" x 4.375"
Displacement
134.2 ci(2.2L)
Compression Ratio
6.47:1
Horsepower (gross)
60@4000rpm
Torque (gross)
106@2000
Main Bearings 3
Valve Configuration
L-head
Carter 626 1bbl