-------------- Original message --------------
From: Kenyon Wills <imperialist1960@xxxxxxxxx>
>
> --- pnkmoore@xxxxxxxxxxxxx wrote:
>
> > I'm curious to know what it
> > means for an engine to have "small duration" as
> > referred to by Roger and/or Gabby.
>
> Others will add, but what it means to me is that the
> cam, which is responsible for bumping open the
> spring-loaded valves, opens them for a shorter
> duration of time, thereby allowing less fuel/air into
> each cycle and yeilding a more fuel-efficient engine
> that is more durable, as an industrial or marine
> engine might be.
>
>
>
> The engine that is an industrial or marine engine is
> obviously not a car engine in its expected
> application, and will likely operate at a co nsistent
> speed, so it has different needs/designs than a car
> engine. Taking a boat out to an island or running a
> welder/cement mixer will result in a very constant RPM
> demand over time, and not the stop & go
> acceleration-oriented stuff that you get in a vehicle.
>
> One important parameter for such an engine might be
> comparative fuel efficiency at the expense of torque
> or HP at RPM that it is not expected to operate at.
>
> -By inserting a different cam into an engine that had
> already been developed, Chrysler and other companies
> are able to broaden their offerings without totally
> reinventing their products.
>
> -Kenyon
>
>
>
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