Alteration of the incandescent microengine into a compression one. Drawing, description

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Alteration of the incandescent microengine into a compression one. Tips for a modeler

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A simple and reliable version of the conversion of the domestic heating micromotor TsSTKAM 2,5K into a compression one was developed by the instructor of the Palace of Pioneers of the city of Chelyabinsk I. Yarov. After modifications, the motor obeys even novice modellers. "Diesel" is especially good for performances in the "air combat" class.

Here's what's changed. Instead of a regular cylinder head, a new, easily removable one was used. This allows you to change the gaskets when choosing the volume of the combustion chamber, to switch to the head of the GSK type in the incandescent version. The very same transfer to another type of fuel takes a few minutes - just unscrew the shirt and install one or another insert.

The regular finning of the cylinder jacket is removed. In its place, a thread M21X0,75 or M21X0,6 is cut. When performing this operation, a mandrel is used to ensure the alignment of the cylinder seat and the machined surface. A new shirt is wrapped on the resulting seat. Its material is aluminum alloy type AK-4, D16T or D1.

For the convenience of working with a removable shirt, it is useful to make a key, the spikes of which fit into the slots in its upper end. At the other end of the key plate, a groove is cut for the hexagon of the glow plug body.

Refinement of the TsSTKAM 2,5K micromotor (click to enlarge): 1 - cylinder jacket, 2 - gasket, 3 - insert, 4 - counter piston, 5 - cylinder sleeve, 6 - modified crankcase

Universal key (click to enlarge)

The insert for the compression version is machined from AK-4 alloy (in extreme cases, from D16T), the seat for the counter-piston is rubbed on the mating part. The counter-piston is brass (LS-59), to increase the resource after grinding, the working surface is chrome-plated.

The counter-piston fitted to the insert should sit in place from strong hand pressure or under light blows of a 25 g hammer. Passing gases through this interface is unacceptable, otherwise all the advantages of the micromotor will be nullified. With careful execution, the converted TsSTKAM 2,5K motors in the compression version significantly exceed the well-known KMD-2,5 even of early production in their characteristics.

Author: A.Stefantsev

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