Flathead facts & figures


Description: facts & figures

Author: panhead
Date: Sun Feb 25, 2024 4:52 pm
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Category: Facts & figures

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ModelYearDescription
W1937 - 1952low compression 45 Solo
WL1937 - 1952high compression 45 ci with 3-speed transmission
WLD1973 - 194245 ci extra high compression with 3-speed transmission
WLDD
WLDRCompetition Special, 45 ci with 3-speed transmission and aluminum heads
WLA1940 - 1945 and 1949 - 1952US Army low compression 45 Solo
XAUS Army
WLC1942 - 1943Canadian Army low compression 45 Solo
WLH1950Special batch for Dutch Military Police
WLJ1951Special batch
WRRace model
WSSidecar Twin, 45 ci low compression with 3-speed transmission and sidecar gearing
G1937 - 1973Servi-Car with tow bar, 45 ci with 3-speed and reverse transmission
GA1937 - 1973Servi-Car without tow bar, 45 ci with 3-speed and reverse transmission
GD1937 - 1941large body Servi-Car without tow bar, 45 ci with 3-speed and reverse transmission
GDT1937 - 1941large body Servi-Car with tow bar, 45 ci with 3-speed and reverse transmission
GE1964 - 1965Large Compartment Servi-Car with airtank, 45 ci with 3-speed and reverse transmission
U1937 - 194874 ci medium compression with 4-speed transmission
UA1939 - 1940Low compression US army 74 SV
USSidecar Twin, 74 ci medium compression with 4-speed transmission and sidecar gearing
UL1937 - 194874 ci high compression with 4-speed transmission
UH1937 - 194180 ci medium compression with 4-speed transmission
ULH1937 - 194180 ci high compression with 4-speed transmission
UHS80 ci medium compression with 4-speed transmission and sidecar gearing
Flathead, 1940 - 1952 Civilian models
W (Iron heads)
WL (Aluminum heads) compression6 to 1
G (Servi-car) compression4.75 to 1
Number of cylinders2
Cylinder bore2 3/4 inches
Stroke96.85 mm / 3 13/16 inches
Wheelbase57 ½ inches
Average delivered power and RPM25 HP at 4500 RPM
Gear Ratios
Motor SprocketClutch SprocketCountershaft SprocketRear Wheel SprocketHigh Gear Ratio
Solo (iron heads)315917414.59 to 1
Solo (alu. heads)305917414.74 to 1
Sidecar275917415.27 to 1
Tire Inflation Pressures
Solo 4"00 tireFront12 lbs.Rear 14 lbs.
5"00 tireFront12 lbs.Rear12 lbs.
Servi-Car4"00 tireFront12 lbs.Rear20 lbs.
5"00 tireFront12 lbs.Rear 16 lbs.

Flathead pictures in the Gallery

Information per year


Sources: Bruce Palmer: How to restore your Harley-Davidson
Greg Field: Original Harley-Davidson Panhead
Peter Henshaw: The legend of Harley-Davidson
Harley-Davidson Panhead Service Manual - 1948 - 1957
This board and various other sources

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