Fuel injection plugs

[James Ballenger]

Howard Wilkinson wrote:

> James:
>     I must take issue with this statement.... my experience with
> engines suggests that this is far from the truth:
>
> >If the engine is not throttled and remains where it will make peak
> power it
> >will have significantly less wear on the engine.
>
> My experience with numerous gas engines over the years would suggest
> that there is a far stronger correlation between % Max BMEP operation
> and engine wear.  At WOT (Max BMEP) combustion temps are greater, the
> lubrication is less effective, and bottom end stresses and bearing
> wear are higher.  Greatest engine life, and minimum wear appear to be
> at lower throttle settings, and constant load.  This may not be
> correct according to the experts, but this is what I've observed to be
> true.       H.W.

I am not familiar with the max bmep term, could you explain?  One this to
consider is the changes that could be made if this were the case though.
At max ve, we could optimize the ignition timing/cam duration/timing to
make max power at this specific point.  By doing so we could significantly
reduce advance and therefore negative torque on the engine btdc.  We would
also have less wear because the engine rpm would be constant and would not
experience varying loads on the bearings and such.  Though temps would be
greater as you mentioned.  Load would not be an issue because the
transmission would compensate, always giving the engine some load.  The
magnitude of the load would be in the engineers hands.  At this point it
seems as though we would be dealing more with transmission reliability
than engine reliability.

James Ballenger