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Analysis of an Extended Stroke, (Offset Crankshaft), Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 03, 2006 by SAE International in United States
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This is a fundamental analysis of an extended stroke, SI engine accomplished by comparing its performance to a typical engine with exactly the same piston data. The stroke extensions include the intake and power strokes, with longer crankshaft durations of 202 degrees, and the compression and exhaust strokes, with shorter crankshaft durations of 158 degrees.
The primary focus of the analysis is to determine the impact on performance attributed solely to the mechanical differences of the two engines. This was accomplished by using an Air Standard Otto Cycle analysis which neutralized potential differences in combustion effects. The secondary focus is a qualitative discussion on potential improvements in combustion efficiency.
CitationJibben, J., "Analysis of an Extended Stroke, (Offset Crankshaft), Engine," SAE Technical Paper 2006-01-0014, 2006, https://doi.org/10.4271/2006-01-0014.
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