What follows are some long term goals and like all such things are subject changes as imposed by reality.
My only real plan for increasing the efficiency of my listeroid engines comes out of how I will be using the engine. Rather then running for long periods of time the engine will likely only be run for an hour or three at a time meaning a significant percent of the run time will be at less then full operating temperature. So when practical I can preheat the engine coolant, sump oil, and fuel if needed (vegetable or thicker used motor oils).
This is a wood/coal burning water heater sold by Sears a while back and will be plumbed into the engine coolant loop as shown by the drawing at the link below.
http://listerengine.com/coppermine/albums/userpics/10034/Engine%20preheat.jpgIt could also be used to supplement the heat from the engine if needed for co-generation, but you would need to sit there and feed it about every five minutes. But a wood gasifying system could be used with the gas being burnt in the water heater.
The other day someone stated that the most efficient way of running a mechanical load from an engine is by direct or belt drive rather then thru a generator and a motor. In that vein I have collected the following equipment to be driven directly by the engine.
An air compressor which has many uses in a wood or metal shop. It will need a rebuild before it can be used.
Also a compressor but it is from a refrigeration system. This link shows something like (very simplified) how it will be setup.
http://home.earthlink.net/~lenyr/refrig.htmThe condenser coil will be in a tank of water a small pump will be used to create a spray to increase the evaporative cooling if needed.
I also have a 600 gallon milk tank which will be cooled by the other end of the system. The chilled water can then be pumped thru a radiator in the house when A/C is needed, this pump and a fan are low powered enough that they can be run off the house batteries and PV system without the engine running. That way the engine and compressor does not need to run all the time while I can still get some amount of cooling. This milk tank has some insulation but when the install is completed it will be better insulated. In colder weather it will be used for storing the engine heat.
The pump in the picture is mainly intended to be manually operated by screwing in a pipe as a handle. But it can also be powered by a connecting rod to the cross hole just below, the other end would be connected to a crank on a suitable gearbox, got one from some junked out farm equipment. I will likely run it with a low voltage DC motor direct off the battery bank but if needed any motor or even a belt to an engine could be used and there is also the manual option.
I currently have a conventional submersible pump down the well, which of course can only be run by electricity and a good deal of it when running even if the average energy use is small.
If I were to drop a jet pump down the well it could be operated by the above piston pump making it possible to get water regardless of what kind of power was available.
This piston pump is also in need of a complete rebuild, even the teeth on the sector and rack gears are worn down to sharp points.