This is a very rough and ready answer, it misses a lot of the finer but important points, but it does answer the question.
with all the bruha over mounting issues of our beloved lister/oid i would like to pose the following questions
1. what makes a stationary engine "stationary" other than it sits in one place?
Enviornment more than anything else, eg always level, no change in altitude or change in climate more rapid than seasonal, not subject to any kind of acceleration, designed differently so maintenance is different, light weight not a design criteria, and of course medium or slow speed (lister at 650 is a medium speed engine)
2. what characteristics does a stationary engine have that a non stationary engine does not have?
(given similar size, power, and cylinder count)
What characteristics does a weight lifter have that a marathon runner does not? they both have 2 arms and legs etc.
Big one is stationary engines are always about generating torque.
Different lube, fuelling and thermal rejection systems, no constraint on flywheel diameter because gyroscopic precession is never an issue, etc etc etc.
3. what considerations in design are to be made when designing an engine to be stationary rather than non
stationary?
Everything is different to a degree, everything rotating or reciprocating needs to be light, because of precessive torque when the non stationary engine moves, you need different sump designs, different cooling strategies, literally everything is different.
Like the difference between a marine engine and a marinised engine, huge. Devil is in the details.
4. do all stationary engines have to be rigidly mounted? if so why?
To draw the centre of mass below the crank radius, and ideally below the crank case.
It's all about fatigue.
Stationary engine are invariably far more expensive by themselves than all other forms, and invariably form part of systems that are vastly expensive and usually critical uptime or serviceability or standby status, that shit has to work on the button for as long as required.
No chain or belt drives for camshafts or injection pumps for example, always pinion driven for maximum durability.
5. what are the primary reasons to rigidly mount a stationary engine?
Reliability and longevity.
6. are there examples of stationary engines that are resilient mounted?
There may be (with resilient defined the way it is in this forum, eg like a car or truck engine) but I have never seen or heard of one that was profesionally done, ever.
7. what make lister engines different than other stationary engines of similar size, hp, and cyl count?
(as it relates to mounting)
Nothing, how many other stationary engines of similar size hp and cylinder can you name?
Kubota, bzzzt, not stationary.
Off the top of my head I can think of Gardner 2lw, cos I used to work on them too, some deutz, some cats, those swedish ones I can never remember the name of and a few obscure small production run english makes.
They really aren't that common in the 300lb per bhp diesel less than 20 bhp and less than 3 cylinder flavours.
Lister made other diesel engines at the same time as the CS series that were not stationary, the clue is there.
i would be very interested in folks answers to these questions, most especially #7
bob g