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The glow plugs used in model engines are significantly different from those used in full-size diesel engines. In full-size engines, the glow plug is used only for starting. In model engines, the glow plug is an integral part of the ignition system because of the catalytic effect of the platinum wire. The glow plug is a durable, mostly platinum ...
Four-stroke model engines have been made in sizes as small as 0.20 in3 (3.3 cc) for the smallest single-cylinder models, all the way up to 3.05 in3 (50 cc) for the largest size for single-cylinder units, with twin- and multi-cylinder engines on the market being as small as 10 cc for opposed-cylinder twins, while going somewhat larger in size ...
There also exist model diesels with fixed compression heads. A few examples are the British 5 cc OWAT or the American DRONE. These engines have a fixed compression ratio, but the compression can be altered slightly with the use of more or less lubrication oil in the fuel. Also the engine's load affects the compression and ignition timing.
2" Scale Steam roller and traction engine models on display at Midland Model Engineering 2007. The 'classic' areas of model engineering interest are live steam models (typically steam locomotives, stationary engines, marine steam engines, Showman's engines, and traction engines), [2] internal combustion engines, [3] and clock making. [4]
Scale Aircraft Modelling, Guideline, January 2013; Plastic Model & Tool Catalog 2015 , Magazine Daichi, April 2015; Lune, Peter van. "FROG Penguin plastic scale model kits 1936 - 1950". Zwolle, The Netherlands, 2017, published by author ISBN 978-90-9030180-8
The model engineering range was extensive throughout the inter-war years, with much production sold as kits of castings, though some complete engines were also sold. Most of the models were designed to be representative of a class of engine, mainly steam driven, rather than an accurate scale recreation of a specific engine.