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[Troy <speedyjeeper@xxxxxxxx>]

--- farna@xxxxxxx wrote:

> The exceptions to in-line smoothness are four and
> odd cylinder (3 and 5) engines. Something about the
> power pulses being to far apart to be smooth, I
> think. The odd ones just don't fire exactly opposite
> each other. Until the advent of computer balancing
> odd cylinder numbers didn't work well except in two
> strokes and diesels. Diesels vibrated anyway, I
> guess, and two strokes effectively double the number
> of power pulses (they fire at EVERY TDC, not EVERY
> OTHER one as a four stroke). Audi was the first to
> make a five cylinder gas engine, and I remember
> reading that computer technology (ignition and fuel
> controls, not balancing) was the key to their
> success. Volvo has made one since the intro of the
> 850, and there's the Suzuki three cylinder engines
> from Japan that was used in the late 80s intro of
> the Geo Metro -- and likely before. 
> 
> On April 5, 2006 Arfon Gryffydd wrote:
> 
> > Inline engines and opposed flat engines (old VW
> Bug) are smoother because
> > their pistons all move on a single plane and thus
> the weight/motion of some
> > counter act the weight/motion of the others.
> > 
> > V- engines have weights (pistions/rods) being
> thrown about on two planes
> > (~60 degrees off) and thus their momentum is not
> cancelled like inline engines.
> 
> 
>
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