Live Steam  
Bitsa Twin Cylinder Steeple Model Steam Engine 
Fully Machined Kit in Brass, Bronze & Steel 

"Bitsa" - bits of this, bits of that. We have a few parts which are surplus or not quite useable but are too good to just throw away, hence the Bitsa Twin Engine kit.

The Steeple or Entablature engine is basically an upside down Marine Twin with 4 Columns and Flywheel from our Beam Engine, mounted on top and base plates.

The engine will of course work as is but customers can tidy up cosmetically by filling redundant holes, trimming surplus material from the Columns, etc., as per preferences.

The kit can also be customised, for example supplied with a single cylinder, flywheel from one of our other engines, pulley wheel, inlet/exhaust manifolds, hex/slot screws, etc. - let us know your ideas.

NOTE: The holes on the Column bases are slightly out of position (hence not usable on the Beam Engine) and the Beam Flywheels have a slight wobble.

The Bitsa engine is a simple design, yet retains the basic mechanics of engines which powered boats, farm equipment, and workshops in the nineteenth century.

NOTE: Pictures are of the assembled model (not painted or polished), lugs removed on the Mid Plate - this listing is for the kit of machined parts.

The Bitsa engine layout has two double acting cylinders, eccentric driven slide valves and the large steel flywheel offers smooth running and is capable of powering a range of accessories, in a variety of roles. The engine also includes triple split bronze pedestal bearings for the crank shaft, tube sliders and a substantial cast base.

On the twin crank shaft, the cranks for each cylinder are offset by 90° which means the engine will self-start in any position.

The engine will run in reverse by applying the steam (or air) input to the outlet ports. Our Reversing/Throttle Valve (optional extra) will control the direction and speed of the engine in either direction.

The kit consists of precision produced parts each carefully made and checked to ensure ease of assembly and reliability in service.

The cylinder assembly and piston are manufactured from brass and the piston shaft, connecting rod, column screws and valve from stainless steel so are not susceptible to the corrosion. The piston shaft passes through an adjustable gland and the steam inlet can be on the front or back of the chests.

Detail Specification:
- Type: Tube Slider
- Bore: 14mm
- Stroke: 18mm
- Flywheel Diameter: 120mm
- Valve type: Piston
- Height: 214mm
- Length: 160mm
- Width: 104 mm
- Weight: 3.1Kg
- Connections: 1/4" x 40 tpi ME

The kit consists of a set of fully machined parts that can easily be assembled using simple tools such as a screw driver, allen keys, pliers and metal file. The parts are mainly unfinished metal and will also require painting, polishing, filing, etc. to achieve the appearance shown in the pictures.

NOTE: The holes on the Column bases are slightly out of position (hence not usable on the Beam Engine), there will be lugs on the Mid Plate (#11 on the Assembly Drawing) and the Beam Flywheels have a slight wobble

NOTE: The kit is supplied with slot head screws (as per the pictures) but socket and hex head screws are available as an option. Some screws as provided may need to the cut or filed to length to complete the model.

Other options also available including a Manifold set which combines the two inlet ports together into a single port.

When assembled the engine is fully working and can be run using steam or simply using compressed air e.g. from hand or foot pumps.

To power the engine with live steam, connect it to one of our Model Steam Boilers.

Bitsa Twin Cylinder Engine Kit

  • Product Code: BVTA
  • Availability: 1
  • £349.00

Available Options

Related Products

Pulley Wheel

Pulley Wheel

The pulley wheel is designed as a simple add-on to all our engines and can be used to drive all kind..


4mm 5.5mm Spanner for M2 and M3

4mm 5.5mm Spanner for M2 and M3

Small stamped steel spanner for use with M2 and M3 hex head screws/nuts.A basic tool for assembling ..


Steam Reversing Throttle Valve

Steam Reversing Throttle Valve

The valve will allow our engines  to be run in forward and reverse and their speed controlled b..


Brass Pulley Wheel

Brass Pulley Wheel

The pulley wheel is designed as a simple add-on to all our engines and can be used to drive all kind..


Tags: Live Steam, Model Steam Engine, Fully Machined Kit, Twin Cylinder