Mastiff IC gas/petrol engine, designed by L C Mason for sale. Horizontally opposed 4 cylinder, 4 stroke. Information on the Hemmingway website. A rare and very interesting engine.
These do not come up for sale very often. This one will need setting up along with a carb etc.
INFO TAKEN FROM THE HEMMINGWAY WEBSITE
Much like Westbury, Leonard Charlish Mason (always "Len") was a polymath with a large variety of interests and disciplines. Following his ever popular design for Minnie, the steam traction engine, he turned his hand to petrol engines. The Mastiff is a genuine triumph of design. Mason has bought together a number of creative, trend-setting features within a compact engine which is in fact not difficult to build. Almost every aspect of the engine has been considered from first principles rather than by following convention.
Known as a great starter and a silky smooth runner, the Mastiff is a compact unit with a particularly low centre of gravity. The horizontally opposed layout provides a low head height, great balance and a stiff crankcase and crankshaft. With a Bore x Stroke of 3/4" x 7/8" the 4 cylinder Mastiff has a swept capacity of 25cc. The side valve arrangement helps to reduce complexity whilst providing ample breathing through 5/16" valves. Mason's camshaft arrangement has considerable merit for the constructor. Loose silver steel inlet and exhaust cams are hardened separately then fixed with Loctite to a mild steel shaft using an assembly jig to ensure perfect orientation.
A vertical shaft for auxiliaries (driven by 2:1 skew gears) is used to power the distributor and oil pump. A pressure relief valve and an external oil pressure indicator are incorporated to ensure good lubrication from the shallow sump. The engine can be built with either a single horizontal or twin downdraught carburettors and the manifold arrangement is neatly achieved without tortuous routing. As the engine was conceived for marine use, water cooling is by thermo-syphon.
The Mastiff stands 6.5" tall, 8.75" long and 7.5" wide over its 0.25" x 32tpi plugs. Interestingly, the hole spacing for the mounting bearers is an exact match for the Myford cross-slide, making running-in a simple affair.
Price: £ 1,680 (No additional VAT to add)
Happy to consider a loco, traction, or stationary/marine/aero engines as a part exchange.
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