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Dietmar Blersch     Biberach, Germany      3/17/2007

4 stroke IC engine with a bore of 25 mm and a stroke of 38 mm


The first run of it was in the first week of February 2007. I made the frame out of 5mm sheet metal, so it was possible to make the it solid and out of 1 piece.

The flywheels are made of ZA 25 alloy. Before I made the governor I studied the old Hercules engine manuals and based on them I constructed this device. To enlarge the forces of the regulator I made 2 lead balls instead of the steel ones that were used in the Hercules engines.

The small brass container between the tank and the carburetor regulates the level of the fuel.  So it doesn't matter if the tank is full or nearly empty, the fuel level is always the same.  If the level in the brass container is falling a little, air gets into the tank from the upper silicon hose of the tank and fuel is flowing into the brass container.  But it's very important that the tank is airtight. If not the fuel system doesn't work.

The next steps I have to make is to replace the glass tank and to build one that looks similar to the one from the old original engines and to spend the engine some paint.  Another improvement to make it look more original will be to construct a spark ignition system .  At the moment the engine is running with a glow plug.

For the fuel I mixed regular model engine fuel with about 15 percent gasoline and 5 percent WD 40. If you add gasoline it's easier to start the cold engine.  Another fuel that I tested is a mixture of about 60 percent alcohol, 20 percent gasoline and 20 percent rizinus for the lubrication. In this case the usage of the gasoline is necessary if the engine is cold when you start it.

In the next time I want to add a small generator ( I recently got a small electric engine from a friend ) and a little lamp to complete it.


Copyright 2007,  Florida Association of Model Engineers and engine builder as noted above, All rights reserved.