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rmw, both us and the competition run the engine at constant speed. But since the rest of their system is different than ours in terms of components involved, my hunch is that they just have a better, cooler running assembly of parts than we do and that it really has nothing to do with the fact...

The hoses run along the top of the frame and are exposed to the elements. Hopefully the attached picture helps. What I think from all this is that the return hose is probably the most important and could probably see an improvement by going up one size and adding some insulation? Probably...

Mike, I can see where larger hoses and reduced pressure drop might be a simple improvement. But assuming the condenser is doing a perfect job and brings the cooled gases down to ambient (as good as it gets), then I don't see how the hose can get any hotter than ambient on its way to the cab...

Mike, absolutely agree. Also more noise from the gear motor and complexity for service. It just goes against my grain to cave in and copy the competition.

Thanks, Mint. I'm obviously not a refrigeration engineer or I wouldn't be asking these questions! Do you agree with IRstuff about insulating the hoses? And can you expand a little on "adsorb" and "sub-cooling" since I'm not sure what happened to those 1970's brain cells that sat thru Thermo 232.

First post here. Seems like a smart group of guys around that can maybe help with this question. We build off-road machines with the engines mounted at the rear, maybe 20' away from the cab, and use an engine driven a/c compressor. This approach has worked great for many years, just not so...

It might be easier to answer the question to know what kind of circuit you are using it in. But to clarify your nomenclature, if I might, it's not really Direct Acting but Direct (Pilot) Operated as opposed to the optional Remote (Pilot) Operated. See...

http://www.spiralock.com/

We make off-road vibrators for seismic exploration and have been using Spiralock for over 25 years on most all female threads. I agree with unclesyd that the load distribution on the bolt is probably the most overlooked advantage. I convinced myself with a 3/8 NC hole and a 3/8 Spiralock hole...

The SPS Unbrako catalog gives the "Calculated double shear strength" of its dowel pins.