Here are the specs for the uncooled engine:

Fuel:                Kerosene
Oxidizer:            Liquid Oxygen (LOX)
Mixture ratio:       1.8 (2.24 is ideal but 1.8 reduces the combustion temp.)
Thrust:              100 lbf
Chamber pressure:    200 psia
Chamber diameter:    2.24 inches
Chamber length:      4.0  inches
Nozzle throat dia.:  0.71 inches
Nozzle exit dia.:    1.23 inches
Injector pairs:      4
Fuel injection dia.: 0.045 inches
Oxidizer inj. dia.:  0.051 inches
Chamber temperature: 5400 Deg R (4940 Deg F)
Specific Impulse:    225 sec