|Authors: || R. U. K. Gustafsson, G. P. Blair, B. I. R. Jonsson |
|Title: ||Reducing Exhaust Emissions and Increasing Power Output using a Tuned Exhaust Pipe on a Two-Stroke Engine|
|Date: || November, 2001 |
|Published:|| SAE Small Engine Technology Conference - Pisa, Italy - SAE 2001-01-1853/4251 |
At the 1999 SETC meeting, a paper presented a simple, tuned and silenced exhaust system for a two-stroke
engine which theoretically reduced both noise and exhaust emissions and increased engine power and fuel
efficiency. In this paper the design concept is applied to a small 56 cc industrial engine and
experimentally shown to deliver the projected behaviour that was predicted in that earlier publication.
Experimental test results are presented for power output, fuel consumption, and exhaust emissions to
illustrate these statements.
An accurate engine simulation software (VIRTUAL ENGINES) package is employed to model the entire two-stroke
engine and to demonstrate not only its effectiveness as a design tool in this area but also that it can
accurately predict the above-mentioned performance and emission characteristics. By examining the output of
the engine simulation it becomes possible to determine the gas dynamic and thermodynamic origins of the
improvement in these performance characteristics and to inexpensively use that tool for further optimisation
and enhancement of the engine performance and exhaust emissions.
You may obtain a copy of this paper at the
SAE International website.