Ralph,


This cute, little Diesel is making a very respectable 0.33 HP at this relatively low RPM.

MVVS uses a steel sleeve, replacing the true ABC setup for it.


To honor the warranty, you should use the manufacturer's recommended fuel.
In reality, as long as you keep the Castor oil content at the recommended level, no damage should occur.
Ether is somewhat less energetic than kerosene at 15,000 btu/lb, compared with about 19,000, so replacing some of the ether with kerosene could give you a bit more power.

Ether is, however, the more volatile, compression sensitive ingredient of the fuel, and MVVS' 45% recommendation is at least in part, to make the engine easier to start and to make it idle more reliably.

Using crankcase pressure to pressurize the fuel tank is not recommended in an R/C engine.

The carburettor will be getting a less consistent pressure curve, when compared with muffler pressure. ...And a Diesel should have very good suction for fuel, making even muffler pressure unneeded.


I would not recommend drilling the back-plate.

See if one of the back-plate top bolt holes extends into the crankcase and use a pressure fitting with the same thread, but it is not recommended anyway.