<div class='quotetop'>QUOTE (Tom @ Oct 22 2008, 01:15 AM)
<{POST_SNAPBACK}><div class='quotemain'>Sureley the oil is still going to be burnt off though just as it always has been? How significant are the emissions from that? Also, if two strokes could be made within reasonable emission levels, would the power characteristics and engine behaviour be as desirable as a 4 stroke?
No not yet. 2 strokes have always had a narrow rpm range for effective operation because they have airflow problems.
Adoption of forced induction will fix that in time.
Why would they need to continue to burn oil? Now that injection can occur without pressure from the crank, there is no need to put lubrication in the fuel. Although, I think some of the modern direct injection 2 strokes still require some additives to lubricate the injectors, but the new lubricants burn far cleaner than 2 stroke oil and not nearly as much is required for lubrication.
Furthermore, I would like to see 2 strokes remain valveless but now that manufacturers have successfully pioneered engine firing after top dead center there is a possibility to have a valved two stroke with very mild forced induction.
Such technologies would eliminate the inefficient energy losses from the empty stroke.