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General design criteria for a 2-stroke engine exhaust system


From what has been previously stated, it is possible to understand how the exhaust apparatus scheme which, if appropriately optimized, best meets the needs of a fast 2-stroke engine provided with a divergent section and a convergent portion (in their actual manufacture, often each of these sections is subdivided into several parts characterized by different tapers, especially for the divergent section).

So far we have talked about optimization in terms of the timing of the depression and compression waves that return to the exhaust port. The objectives of this optimization are essentially two: 1) the depression must reach the discharge port when the piston begins to detect the transfer port, so as to favor the washing of the chamber by extracting the spent gases and facilitating their filling with the fresh charge; 2) the compression wave is required to reach the discharge port when the transfer port is closed and only the exhaust outlet is open, so as to limit the loss of fresh charge towards the muffler.

FIGURE III Typical geometrical parameters of a typical exhaust system formed by: an initial cylindrical section (exhaust manifold), a divergent section, a cylindrical central section (if any), a convergent section, and a final cylindrical section (“stinger or needle valve terminal”).
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In this issue: CIK FIA EUROPEAN CHAMPIONSHIP OK-OK JUNIOR FINAL... A THRILLER! In Normandy there was the last challenge of the European Cik Fia Championship where the German Hannes Janker (KR/Parilla) in OK and the Estonian Paul Aron (FA Kart/ Vortex) in OKJ conquered the Continental title with performances not up to par. RACING DKM - ROTAX MAX CHALLENGE - IAME X30 CLOSE UP BRAZIL MOTORSPORT SWEDISH KART LEAGUE VINTAGE ALA KART TECHNICAL SIDE The exhaust system in high performance 2-stroke engines - Part II WATER TEST LUCID KART WATER PUMPS PREVIEW CIK-FIA WORLD CHAMPS & CIK-FIA WORLD JUNIOR CHAMPS IN KRISTIANSTAD, SWEDEN