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Stelzer engine

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Title: Stelzer engine  
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Subject: Piston engine configurations, Flat-ten engine, V5 engine, Orbital engine, Rhombic drive
Collection: Free-Piston Engines, Proposed Engines
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Stelzer engine

Stelzer engine

The Stelzer engine is a two-stroke opposing-piston design proposed by Frank Stelzer. It uses conjoined pistons in a push-pull arrangement which allows for fewer moving parts and simplified manufacturing. An engine of the same design appeared on the cover of the February 1969 issue of Mechanix Illustrated magazine.


  • Operation 1
  • Applications 2
  • Prototypes 3
  • See also 4
  • References 5
  • External links 6


There are two combustion chambers and a central precompression chamber. Control of the air flow between the precompression chamber and the combustion chambers is made by stepped piston rods.


Applications envisaged for the engine include driving:


A prototype engine was demonstrated in Frankfurt in 1983 and Opel was reported to be interested in it. In 1982, the Government of Ireland agreed to pay half the cost of a factory at Shannon Airport to manufacture the engines. [1] A prototype car with a Stelzer engine and electric transmission was shown at a German motor show in 1983.[2]

See also


  1. ^
  2. ^ Popular Mechanics, March 1984

External links

  • U.S. Patent 4,385,597 -- Two-Stroke Internal Combustion Engine 1983
  • Diagrams of Stelzer engine and linear alternator
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