Live Steam 
Quad Cylinder "Mill" Model Steam Engine 
Fully Machined Kit in Brass, Bronze and Steel 

The horizontal four or quad cylinder "mill" engine is two twin cylinder mill engines connected via a large fly wheel on a steel plate and optional manifolds.

As such it is still relatively simple and retains the basic mechanics of engines which powered mills and workshops and which needed the extra power provided by a quad cylinder engine.

NOTE: Pictures are of the assembled kit, this listing is for the kit of parts. Also shown are the optional manifold and pulley wheels

The classic mill engine layout has four double acting cylinders, eccentric driven slide valves and the large brass flywheel offers smooth running and is capable of powering a range of accessories, in a variety of roles. The engine also includes 2 x triple split bronze pedestal bearings for the crank shafts, tube sliders and very substantial cast bases.

On the 2 x twin crank shafts, 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.

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 rods, column screws and valves from stainless steel so are not susceptible to corrosion. The piston shafts passes through an adjustable glands and the steam inlet can be on the top or bottom of the chests, left or right hand sides.

Detail Specification:
- Type: Tube Slider
- Bore: 14mm
- Stroke: 18mm
- Flywheel Diameter: 70mm
- Valve type: Piston
- Height (excluding manifold): 75mm
- Length: 150mm
- Width: 240 mm
- Weight: 3.3Kg
- 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 kit is supplied with slot head screws but hex head screws (as per the pictures) and socket head screws are available as options. Some screws as provided may need to the cut or filed to length to complete the model. Optional manifolds and pulley wheels are available.

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.

Horizontal Mill Quad Cylinder Engine Kit

  • Product Code: HQA
  • Availability: 8
  • £490.00

Available Options

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