Universal Atomic 4

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The Universal Atomic 4 is a four-cylinder, gas engine produced by the Universal Motor Company between 1949[1] and 1984 for use as auxiliary power on sailboats.[2] Both 18 horsepower (13 kW) and 30 horsepower (22 kW) versions of the engine were produced.[3] Over 40,000 of the engines were produced during that time, with an estimated 20,000 still in use today.

History and Lineage[edit]

The Atomic 4 is descended from an earlier Universal Motor Company design called the Utility Four, which was used extensively in World War II by the United States Navy and allies to power the lifeboats for the ships, barges, and tankers of many navies and merchant marine fleets. The Utility Four was replaced by the Atomic 4 in 1947.

Specifications[edit]

Engine Type Four Cylinder, Vertical, 4 Cycle, L-Head
Bore 2 9/16" x 3 1/8"
Displacement 64.46 Cubic Inches
Compression Ratio 6.3:1
Engine Rotation Counter-clockwise from flywheel end
Firing Order 1-2-4-3 (no. 1 on flywheel end)
Reduction Gear Ratio 2.04:1 or direct 1:1 drive
Maximum Operating Angle ~15 degrees
Fuel regular leaded gasoline (will function on unleaded fuel with precautions)
Lubrication Oil SAE 30
@ RPM 600 1000 1500 2000 2500 3000 3500
Brake Horsepower: 5 7.3 11.9 16.2 20 25 30

References[edit]

  1. ^ MotorBoating. May 1981. pp. 112–. ISSN 1531-2623. 
  2. ^ MotorBoating. August 1976. pp. 49–. ISSN 1531-2623. 
  3. ^ MotorBoating. November 1965. pp. 52–. ISSN 1531-2623. 

External links[edit]