This is real easy, except people don't want it to be.
Lister said concrete block, nothing else, during the entire production run of the CS from 29 to 81.
Lister made lots of other engines and did lots of other engineering, the CS was only a small part of their output.
Many if not most of the other engines they made were shipped with flexible mounts specified, ergo Listers, surprise surprise, knew all about resilient mounts, but still never said they were permitted or recommended on a CS
The CS was notable for many things, not just a long production run, but unlike much of the rest of their production, the CS series was designed to basically run forever and never wear out.
If you take an low and reasonable average hours of a CS at 50k and production of 250k units then by the time Lister were printing the installation instructions in the 80's they had about 12.5 million installed hours experience at a very conservative estimate.
It is a STATIONARY engine, if you wanted a portable, semi portable, marine, traction or other engine they would steer you towards a different model in the range.
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As I have stated elsewhere, I was working for someone who needed to see if a lister could be driving a hydraulic pump on 24/7 duty on flexible mounts on a barge, solid mounts would have made her thrum like a rail, so we can experiements with proper strain gauges and proper data capture under a wide range of loads and conditions (with the caveat they were all run on a good engine with no malfunctions) (don't forget the sump design, a barge was ok because it was flat and negligible wave motion) and as I said I can't recall the numbers exactly but as expected there was an amplitude of over a ton on the mounting bolts, which is why Lister used 3/4 bolts eh.
As I have stated else where, been doing engineering all my life, and when you are talking about complex systems, and technically speaking a DIY steel frame and randomly selected mounts that deteriorate with age and varying load conditions etc etc is a very complex system, and complex systems cannot be modelled economically until the capital investment is measured in the tens of millions of dollars, and finite element modelling is not only expensive, it is anything but fast, quicker to built a test bed (which many of you will do) and add strain gauges and capture data (which none of you will do)
RSJ and other extruded steel forms were about when lister was making steel bases for CS series, but they never used them, they welded up honeycomb base structures with very large amounts of deposited weld and very long welds, with a very high proportion of welds (in the honeycomb base) wrapping around an edge of plate, which just about triples the weld strength.
Listers were a short days journey by horse from where cast iron as an engineering material was basically invented, they knew all about its properties and how it differed from steel.
If Listers did not do something, they had a reason, and the reason is usually easy enough to percieve, unless you have an agenda.
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None of this says it is an engineering impossiblity to mount a CS on flexible mounts and not detract in any way from the performance of the engine when mounted on a concrete block.
Unless you have a "Standard" (with a capital S) steel frame then every last one is bespoke, and needs to be treated afresh, ditto specification of mounts and mount points etc
This is not a trivial engineering task, doing it is easy, doing it WELL will be vastly time consuming and expensive, and the same end results can be achieved more rapidly in other means. Fools rush in where angels fear to tread.
I'm a time served engineer, I grew up around CS and probably have 100k hours of being "around" them on a daily basis, I grok computers, data aquisition hardware and software, FEMS, and I live in a place where just about anything engineering I want is at worst a phone call away, and I would shy away from a DIY skid frame and resilient mounts, they are a direct analogy to the railway sleeper and cast iron trolley I bought mine on, ok for a few hours here and there in a field not under full load.
Not because I couldn't do a good job of work of it, but because life is too short to spend 400 hours achieving something that can be achieved in 8 by other methods.
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The vast majority of you don't even have listers, you have one of a variety of knock off cheapo copies, and by definition you do not know what corners were cut or what effects they have, long or short term.
The best way I can characterise the approch that I see here is many of you appear to think you are starring in your very own episode of mythbusters, can I rubber mount my listeroid so I can stand next to it and feel no vibes?
Yeah you can, provided you are honest, and speak aloud the subject, it only has to work long enough to film the episode and bust the "myth" because by definition you are moving the goalposts and most certainly do not want to play the 100k hours of reliable running scenario.
There are two camps here, and the ones like Mr Belk who isn't playing and needs that shit to work else it is back to stone age survival techniques with tallow candles for light and so on are quite happy to take lister word on the product they made and know better than anyone else. And then there is the other camp, and quite honestly given what many of them appear to want to do if I was an engine salesman I would NOT have steered them anywhere near a lister.
You can, technically, rubber mount a CS PROPERLY, but by definition if you have the ability you would know enough not to try, just like you can, technically, wire a house with live cable, but a coded sparky wouldn't do it (lightly, though he will have a take to tell)
Bob is playing devils advocate and looking for answers that way, they won't come at zero cost and over the internet, catch a flight over here and I can introduce him to people and let the dog see the rabbit.
To give an analogy.
Birmingham (the one here in the UK) was at one time the world centre for small arms production, amongst other things they made 2 shilling muskets for trade, pop a match in the flash hole, stand upright, fill with water and leave overnight, if it didn't weep they were sold.
This got them such a bad name the better gunsmiths of brimingham went to parliament and got a law passed and built their own barrel proofing house (it is still in use today as a matter of fact) which got them their good name back and differentiated them from the trade musket makers.
Mr Belk I am sure will either know this story, or know his subject well enough to accept it and give half a dozen other examples.
Doo wah diddy with his copy of the anarchists cookbok and instructions on how to make a zip gun will say it is all bollocks, just as the naysayers do here, and come up with pressure calculations and flame speeds etc etc to prove they are right, it can be done their way.
Well, it can, by the likes of Mr Belk, but not by them.
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