Universal Atomic 4
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
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
| 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
- ↑ MotorBoating. May 1981. pp. 112–. ISSN 1531-2623.
- ↑ MotorBoating. August 1976. pp. 49–. ISSN 1531-2623.
- ↑ MotorBoating. November 1965. pp. 52–. ISSN 1531-2623.
External links
- Links to full Atomic 4 technical manual and owner's guide in .pdf format from Engines1.com
- The Care & Feeding of an Atomic 4
This article is issued from Wikipedia - version of the 11/25/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.