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A Mastiff engine that we have just acquired. Looking very smart indeed. Do have a look at the photos. We plan to get thie engine running (have every expectation it will run) and will update this web page when we have. If you are interested please do call anyway.
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.
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We have now got this engine running. We have sorted the wiring and firing order. We have added a small aero engine carb to the top inlet and added an insert to the flywheel, a pulley pull cord starter. The engine runs nicely however we think our carb is too small and a bit difficult to adjust, but at least it was able to demonstrate the engine runs. Apparently some people elect to have twin carbs that sit directly on the inlets. I will say there is some weeping of sump oil that is perhaps coming from the flywheel end of the crank, so perhaps a bearing seal needs replacing if it bothers you.
I also have a video on my phone that I can WhatsApp to your phone. It sounds lovely when runnig too.
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.
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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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.
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Call Howard on 01225 812155 or
07753 610420
Alternatively email: sales@myford-lathes.com
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