Em 7/3/2011 19:12, AK escreveu:
> Just to clarify, it's possible the VW engine has a waste spark during
> the exhaust cycle, this is not all that uncommon with lawnmower
> engines.


I have seen some engines with this "waste" spark. I think it simplifies
the design.
The manufacturer says it helps to burn some fuel that may have remained
unburned. To me they are just trying to "fancy" the facts.

I have also seen at least one engine that produces sparks at the end of
each stroke, even at the end of the intake stroke. It seems that the
uncompressed mixture doesn't detonate even with the spark.
This engine doesn't need a distribution system, each cylinder has a
spark at each half-turn of the crank-shaft.


Isaac


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