Duesenberg straight-8 engine

This article is about straight-eight engines made by Duesenberg. For the automobile marketed and sold under the name "Duesenberg Straight Eight" from 1921 to 1926, see Duesenberg Model A.
Duesenberg straight 8
Overview
ManufacturerDuesenberg/Lycoming
Production1921–1937
Layout
ConfigurationOverhead cam multivalve overhead valve straight-8 engine

The Duesenberg straight-8 engine was produced from 1921 to 1937 and sold in Duesenberg automobiles. Fred and August Duesenberg got their start building experimental racing engines which achieved a great deal of success. Among their accomplishments are wins at the Indianapolis 500, the 1921 French Grand Prix and speed records at the Bonneville Salt Flats. They used the expertise they had gained to start building production engines and cars which were renowned for their performance and luxury.

Among the novel design features (for a pre-1940 production engine) seen on various Duesenberg engines are single- and double-overhead camshafts, three- and four-valve heads, superchargers and aluminum castings.

Production engines

Main articles: Duesenberg Model A and Duesenberg Model J
Duesenberg Model J engine[1]
Overview
ManufacturerDuesenberg
Production1928-1937
Layout
ConfigurationStraight-eight engine
Displacement420 cu in (6,900 cc)
Cylinder bore3.74 in (95 mm)
Piston stroke4.76 in (121 mm)
Cylinder block materialCast iron
Cylinder head materialCast iron
ValvetrainDOHC, 4 valves per cylinder
Compression ratio5.7:1
Combustion
SuperchargerDuesenberg centrifugal (optional from 1932)
Fuel systemSingle updraft Schleber carburetor
Fuel typeGasoline
Cooling systemWater-cooled
Output
Power output
  • 265 hp (198 kW) at 4,250 rpm (normal)
  • 320 hp (240 kW) at 4,200 rpm (supercharged)
Chronology
PredecessorDuesenberg Model A engine
Production Engine Displacement Bore x stroke Cam and valve Model
1921–1927 260 259.7 cu in (4,256 cc)[2] 2.875 in × 5.000 in (73.0 mm × 127.0 mm) SOHC 2v A, X
1928–1937 420 419.7 cu in (6,878 cc) 3.750 in × 4.750 in (95.3 mm × 120.7 mm) DOHC 4v J, SJ, SSJ

Competition engines

The engines listed below were designed by Duesenberg for the Indianapolis 500. Some engines of the 122 CID and 91 CID design were bored/stroked to larger displacements for other races classes, after the 1930 rules change at Indianapolis.

Production Engine Displacement Bore x stroke Cam and valve
1919–1921[3] 300 296.9 cu in (4,865 cc) 3.000 in × 4.750 in (76.2 mm × 120.7 mm) SOHC 3v
1921-1923[3] 183 183.0 cu in (2,999 cc) 2.500 in × 4.660 in (63.5 mm × 118.4 mm) SOHC 3v
1923-1925[3] 122 121.3 cu in (1,988 cc) 2.375 in × 3.422 in (60.3 mm × 86.9 mm) DOHC 4v / DOHC 2v (supercharged)[4]
1926–1929[3] 91 90.3 cu in (1,480 cc) 2.286 in × 2.750 in (58.1 mm × 69.9 mm) DOHC 4v
1930–1932[5] 244 244 cu in (4,000 cc) ? SOHC desmodromic

See also

References

  1. ^ Cheetham, Craig (2006) [2004]. Vintage Cars. St. Paul, MN USA: Motorbooks. pp. 75, 79. ISBN 978-0-7603-2572-8. Retrieved 2013-12-13.
  2. ^ "Directory Index: Duesenberg/1922_Duesenberg_Model_A_Catalogue". Oldcarbrochures.com. Retrieved 2011-11-20.
  3. ^ a b c d Borgeson, Griffith (1998). The Golden Age of the American Racing Car. SAE International. ISBN 978-0-7680-0023-8. Retrieved 2009-07-05 – via Google Books.
  4. ^ Vaughan, Daniel. "1925 Duesenberg Eight Speedway Roadster". conceptcarz.com. Retrieved 27 August 2016.
  5. ^ "Duesenburg SOHC 8 Cylinder Indianapolis Racing Engine". Museum of American Speed. Retrieved 27 August 2016.
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