The Lister 12/2 mates up well with either the ST7.5 or ST10 head. My designation for this combination is simply 12/2ST7.5 or 12/2ST10. Lister produced a generator based on the 12/2. My effort follows the same general layout making use of the stronger and more efficient micro Vee belts that are available at your nearest auto parts store. Expect 6KW continuous, and lots of capacity for short intervals to start motors like well pumps.
This is another page that will be added to and changed in my usual random order. At the bottom of this page is a link to the old Lister generator sets, they are beautiful!
With the experience I am gaining with the 6/1, it is time to start putting the 12/2 together. Today I went down to Binford Scrap Metal and found some heavy six inch U channel. I gave about $8 for all the metal required to make the base, I would imagine I would have paid $80 to $100 for new metal.
I spend a good part of the day cutting it and welding the base. The idea is to get support under the whole base of the engine, and have everything looking like it was made to go together.
I am very pleased with the basic set up on the 6/1, the idea of mounting the head on something that tracks between the rails works very well. With this set up, it's easy to fit a belt tension system and a anti twist adjustment to assure that the head is in alignment and stays there. I will refine the tension system just a little more when building this unit.
This frame will take two men and a boy to move around when I get done, but considering we're going to mount an engine that weighs 1432 pounds on it, who cares about a few extra pounds?
The goal will be to keep things compact, this engine has a lower base than the 6/1 and the flywheels hang lower than any part on the engine. The six inch channel 'up on end' raises the base high enough to keep the flywheels in the air.
July 21, 2002
The 12/2ST10 Listeroid is taking shape. The ST head got a new dog house that looks more the period and some green paint. This equipment looks like it belongs together. Notice the custom pulley, the drive is based on an 8 rib micro groove belt, versus the 6 groove used in the 6/1.
Engine 1432 pounds, generator head 305 pounds, base 100 pounds, generator carriage, 15 pounds, generator pulley 13 pounds. We're at 1865 pounds and have lots of stuff to add yet.
Other projects have kept me away from the 12/2. I made some time to check out the oil pump. there's a bolt in the top that can be removed to check for oil pressure. This one had next to no oil being pumped! I finally took the pump loose and disassembled it. It is of the plunger type and appears to be as simple as it gets, a check ball prior to the plunger, and a check ball after the plunger feeding the oil galley.
Above is a crude drawing of the plunger pump. Red is the plunger driven off the lobe on the cam shaft, two ball checks, some springs, and that's about it.
After cleaning up the pump, I noticed I could easily blow by the check valves! Looking at the seats, there was no mystery as to why. I think they may have missed the step of cutting one seat. I manufactured a tool to shape the seat and all seems to work well now. The volume of oil the pump delivers is low, if you have an engine like this, make sure the plunger pump is delivering oil before you run it!
After optimizing the operation of this pump, I allowed it to set for a week. With compression released in both cylinders, I removed the bolt at the top of the pump and turned the engine over many times without seeing oil at the output of the pump.
I have noted that many of the old Listers were fitted with a hand operated priming pump, I feel it would be an excellent idea to fit this engine with same. At the very least, I'd take this easily removed bolt out and pour some oil into the pump BEFORE I attempted to start this engine after it sat for more than a few days. If I get another Lister with this type of pump, I will see if it operates any better. Perhaps the ball checks will 'seat in' with some use and cure the problem?