page_title: Stuart Turner (company)
section_title: Gas/petrol engine kits
hierarchical_section_title: Stuart Turner (company) / Gas/petrol engine kits
context_page_description: Stuart Turner Ltd is a British engineering company, based in Henley-on-Thames, Oxfordshire, England, founded by engineer Sidney Marmaduke Stuart Turner in 1906.
context_section_description: 400
  A horizontal single-cylinder open-crank gas engine dating back to the 1920s with hot tube or spark ignition, 1.6875-inch bore and 3-inch stroke. The crankshaft was overhung, i.e. single main bearing.
  600
  A substantial horizontal single-cylinder open-crank gas (0.75 HP) or petrol (1.0 HP) engine. 2.5-inch bore, 4.5-inch stroke. From ST's 1930 catalogue "Its very efficient governor renders it particularly adaptable for lathe driving, and other variable loads".
  800
  A smaller horizontal single-cylinder open-crank gas (0.25 HP) or petrol (0.5 HP) engine based on the 600, but better suited to being made with a small lathe. 1.5-inch bore, 2.75-inch stroke.
  Sandhurst
  A horizontal single-cylinder open-crank gas (0.66 HP at 900 rpm) or petrol engine. 2-inch bore, 3-inch stroke, 150 cc, c. 1935, but also listed in the 1969 Stuart catalogue.
  AE
  A 60 cc four-stroke flat twin supplied only as castings, air or water cooled. Could also be supplied as a single-cylinder model, which was a useful capacity for 30 cc tethered boat and hydroplane class. 34.5 mm bore, 32 mm stroke. Made from around 1910–1912, these early versions had an automatic inlet valve.
  New AE
  A 60 cc four-stroke flat twin supplied only as castings, air- or water-cooled. The 'new' version was introduced in c. 1930 and produced until the war. It had both crankshaft and camshaft running in ball bearings, duralumin connecting rods, aluminium piston, and valves all mechanically operated. There was also a single-cylinder version. The twin produced 3/4 bhp at 3000 rpm, and 1.3 bhp at 4200 rpm, weight 7.5 lb including the flywheel. The single weighed 4.25 lb and produced 0.6 bhp at 4500 rpm. In the 1938/1939 Stuart Turner catalogue the air-cooled version of the twin-cylinder engine was also available with 1.5-inch bore and 1.75-inch stroke, giving 74 cc. The advertising suggests the main market for these engines was 'record breaking model boats and hydroplanes', and the single's 30 cc capacity was stated in 1931 to 'conform(s) to the rules of International Power Boat racing'.
  Lightweight
  With the same bore and stroke as the AE, the lightweight single-cylinder 2-stroke is 29 cc, 1/8 bhp, revs to 3500 rpm, and weighs 3 lb 12 oz, 5 lb 12 oz with flywheel. Like many Stuart Turner engines the Lightweight had iron pistons. It was water-cooled, and was available either as a finished engine or as a set of castings. Advertised in the 1931 catalogue as 'completely redesigned' making it 'easier to machine and lighter', it was probably introduced in the late 1920s, and was for sale through the 1930s, advertised sitting in the palm of your hand. It also appeared in the 1969 catalogue as a kit either water or air cooled, this time with an aluminium piston. An Amal carburettor was available as an optional extra.
  W2
  Three 147 cc engines were listed as new in the 1931 Stuart Turner catalogue all rated at ​¹⁄₂ HP at 1000 rpm. With 53 mm bore and stroke the W2 was a 2-stroke, and water cooled. The engine featured a cast iron piston and steel H section connecting rod. The steel crankshaft could be supported in either plain or ball bearings. The kit did not include a carburettor, stating that 'any good carburetor of the correct size may be used', though a range of extras listed included a Villiers carburetor. Likewise, the magneto was not included, stating that 'any standard single-cylinder magneto of 35 mm centre-height may be used', though an English magneto of unspecified make was listed among the extras available.
  A2
  The air-cooled version of the W2, identical in every other respect. In this kit only the cylinder was provided ready machined and ground. In the other kits this could be requested as an option.
  W4
  A water cooled 4-stroke overhead valve version of the W2. Separate inlet and exhaust camshafts ran in bronze bearings. The gear wheels to drive them were supplied ready-made. The four-stroke crankshaft could only use ball bearings.
caption: Stuart Turner Type 600 engine running on gas
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