On 5/28/04 2:26 PM, "Al Hatten" <alhatten@xxxxxxxxxxxxxx> wrote:
> That doesn't sound right. Diesels are 2-stroke engines similar to bike
> engines except that they have an intake valve.
>
Diesels got both 2 and 4 cycle engines.
http://www.marinediesels.info/Basics/the_4_stroke_engine_explanation.htm
http://www.marinediesels.info/Basics/the_2_stroke_engine_explanation.htm
> They need exhaust back pressure to properly scavenge the cylinder, otherwise
> excess gas (and raw fuel) would go through without burning.
>
I am not sure I understand what you meant by 2-cycle engines needing back
pressure to scavenge. Back pressure tends to impede the flow of gas into the
exhaust. I worked on a couple of 2 cycle outboard boat motors that my father
and brother-in-law had tuned so that a pulse of air, that was below ambient
pressure, would arrive at the exhaust valve just as it opened to encourage
more flow from the cylinder then had it seen ambient air pressure.
> Al Hatten '93 Virago XV-1100 VOC #7745 Napa,CA - Wine Country
--
Doug
Tir na nOg
[Tir na nOg is a mythical place where no one ever gets old. It is the land
of the forever young in an Irish legend.]
Copyright ) 2003 Douglas W. St.Clair
___________________________________________________________________________
(un)subscribe info, archive: http://archives.itg.uiuc.edu/virago/
