Here's my thought;
1) Leave your existing 25/2 connected to your generator
2) Mechanically lock a 1000RPM rated engine to your 25/2
Then, heres where the fun/creativity comes in:
Monitor (any, all, or a combination):
Fuel rack position
Electrical
Engine run time
Oil pressure, water temp etc
And use those paramaters to alter fuel position, compression release, total shutdown etc.
You could use simple mechanical springs, or a complex electronic system to do this.
I rigged up a small little "black box" to do this with some portable diesel generators. When the load approaches the max (18Amps out of the max 20Amps), the device activates the electric starter on the second genset for up to 10 seconds util it sees voltage output on the Gen head or charge coil. Then waits until the two are within sync by about 20V, and then closes the two together, locking them in phase. When the load drops down to below 16Amps per phase, the relay is opened, the two generators fall out of sync, and the second generators shut down selenoid is actived. (They're both diesel) It required some rewiring of the generator, but sure works nicely. Only works if you are slowly adding small loads though, adding a 20amp load pulls the voltage down so low that the two gens wont come in sync without some tweaking on the governor of the second generator before the breaker trips out on the first unit.
Have some fun,
Steve
