Re: IML: 354 Hemi Industrial

[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 consistent
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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