Price Units


10/1/2012 Note: Act now as we have only 3 engines left in the current production run, scheduled to be completed in November. – SOLD

10/1/2012 Note: Act now as we have only 2 engines left in the current production run, scheduled to be completed in November.

Subsequent orders for manufacturer delivery is estimated in March 2012.

Title Input Calc Constants Value Units
MAWP – Maximum allowable working pressure 150
To Determine Steam Engine Boiler Horsepower
P – Mean Effective Pressure in Cylinder 80% of
120 Mean Effective Pressure in Cylinder 80% of boiler 80%
L – Length of Stroke in feet 4 0.3333333 Converted to Inches.
A – Area of Piston in Inches 3 7.0685835
N – Revolutions per minute 700 700
Boiler HP
6.00 1 HP = 33,000 ft-lbf/min 33000 ft-lbf
Engine Horse Power with 2 pistons 11.995172
Pounds of steam per hour 413.83 The Boiler Horsepower (BHP) is the amount of energy
required to produce 34.5 pounds of steam per hour at a pressure and
temperature of 0 Psig and 212 oF, with feedwater at 0 Psig and 212 oF
34.5 lbs
Gallons of water per hour 50 Water Weight per gallon 8.3 lbs
To Determine Electrical Generation
Horse Power (20% less)
9.5961376 Pulley Efficiency 80%
Kilo Watts per hour with loss 6 Generator Efficiency 80%
AMPS per hour 49.80 Watts per HP 746 watts
To Determine Boiler Fuel Usage
BTU Input 413833.43 1000 BTU’s per pound of steam for a BHP is
equivalent to 33,475 BTU/Hr
Actual BTU Input with Added Fuel 496600 20% fuel Added for inefficiency
Lodgepole Wood BTU per pound
6206 20%
Moister of Lodge-pole Pine based on Site:
2465 pounds
per cord
Pounds of wood per hour 80.02
Cord per hour 3.25%
P=Mean Effective Pressure in
Cylinder (MEP)
L=Length of Stroke in FEET (times
2 for Double acting engine)
A=Area of Piston in Inches
N=Revolutions per minute

Manufacturer’s Details:
This two-cylinder, up to 20-horsepower, 3 x 4-inch, double-acting, 90° “V” engine is designed in the simplest possible form for steady-state power production.
It will produce up to 20 hp with a maximum of 200 psig @ 700 rpm.
It is well balanced and is designed for self-starting.
Its low-speed torque is in the order of 200 ft-lb and should be handled carefully.
It has very large balanced piston valves that will greatly increase its efficiency and can stand a considerable amount of superheat. Its nominal cutoffs are 55% admission and 65% exhaust. Cylinder clearance volume is in the order of 12–13% and will allow for moderate compression, which helps in starting the engine from cold.
Admission starts at 1% before dead centers to aid in high-speed running with the standard 55° eccentrics.
This engine is not equipped with reverse or variable valve timing.
Power can be increased by changing the eccentric angle to 60- 65°, but this also decreases engine efficiency.
This engine has a drip valve on the bottom of each valve bore to augment getting rid of condensed water when the engine is started from cold.
Warning:  Hydraulic lock and damage can occur when a piston-valve engine is started carelessly from cold.
The two-cylinder “V” engine design was used with great success for small engines by Abner Doble and by Bill Besler in his famous steam-powered airplane.
It is the simplest and lightest configuration for a two-cylinder engine and requires only two crank webs and a crankshaft of only five parts.
The intake and exhaust manifolds are not included. Motor mount brackets can be made out of 1-1/2″ steel angle iron 18″ to 24″ long and bolted to the two bottom ½” holes in each end plate.
It is advisable to mount a 8 to 10-inch pulley on the CW main shaft for hand rotation to ease starting the engine Add approximately one quart of MOBILE SYNTHETIC 30-40 weight air compressor oil to the crankcase, view the level in the crankcase sight glass. This oil will not solidify if water/steam were to enter the crankcase. Regular synthetic oil can be used. Connect low-pressure air to the two steam inlets in the two blocks and the engine should run nicely. It would be wise to recheck the valve timing and make sure that the admission to both the piston top and bottom are about equal. Correct valve timing is most important. Install an engine oiler before running on hot steam.
ENGINE OILING— On occasion open the bottom drain plug and see if any water has accumulated in the bottom of the crankcase. If so, let it run out, and then close the drain plug.
Before operation, make sure the oil level is visible in the sight glass. This engine requires steam cylinder oil injected into the steam line to protect the valve and piston from wear. MOBILE ONE synthetic oil of 400 viscosity is recommended, as well as any steam cylinder oil. The feed rate should be in the order of 1 quart per every 50– 60 hours of operation with highly superheated steam.