The Lempor ejector is a Steam locomotive exhaust system

Steam locomotive exhaust system

The Steam locomotive exhaust system consists of those parts of a steam locomotive which together discharge exhaust steam from the cylinders in order to increase the draught through the fire...

 developed by noted Argentine locomotive engineer Livio Dante Porta

Livio Dante Porta

Livio Dante Porta was an Argentine steam locomotive engineer. He is particularly remembered for his innovative modifications to existing locomotive systems in order to obtain higher performance, energy efficiency and reduced pollution. He developed the Kylpor and Lempor exhaust systems...

. In a steam locomotive

Steam locomotive

A steam locomotive is a railway locomotive that produces its power through a steam engine. These locomotives are fueled by burning some combustible material, usually coal, wood or oil, to produce steam in a boiler, which drives the steam engine...

, draft

Draft (boiler)

Draft is the flow of combustion products going from the firebox, through the boiler and up the stack. Draft may be natural, produced by the rising of the combustion gases in the stack, or by mechanical means, for example a blower...

 is produced in the firebox by exhausting the steam coming from the cylinders out of the chimney, or also by a blower. The LemPor exhaust delivers a 100% improvement in draughting capacity over traditional exhaust systems. The Lempor Ejector also ejects differently to the conventional blastpipe; as one cylinder ejects it creates a vacuum in the other cylinder, thereby requiring less power to drive the piston. Overall the Lempor ejector increases locomotive power by about 40%. The name is a combination of the names of Jean Lemaître

Jean Lemaître

Jean Lemaître was a mechanical engineer from the Nord Belge Railway, who developed a Steam locomotive exhaust system.The Lemaître Exhaust featured 5 nozzles in a circular pattern exhausting up a large-diameter stack, with a variable area nozzle exhausting up the center, and improved efficiency by...

and Porta.

External links

• LemPor Exhaust on The Ultimate Steam Page.