Heavy Fuel System

Background information of our HF-Engines:

End of 2007, 3W-Modellmotoren started with the R & D of Heavy Fuel Engines. 3 groups of technicians worked intensively 2 shifts per day to find a practical solution. Existing systems had been tried out with disappointing results which did not satisfy our demands.

Than a new approach was started:

• Crankcase was pre heated for the cold start of the engine using cartridge heaters.
• Air intake section and carburettor were modified.
• For 1-cylinder engines a special shaped muffler with integrated heat collector accepting cartridge heaters had been fitted.
• For 2-cylinder engines 2 heat collectors (1 for each cylinder) with cartridge heaters were fitted.
• Engines were tested with an ambient temperature of +45°C in our test room. Starting and running without problems.
• To simulate low temperatures, a 5Ltr. Tank with JET A-1 was stored in the deep freezer at -18°C over night. Cold start was no problem.

The combination of all the modifications was a break through of all efforts and hard work.

3W-Modellmotoren GmbH applied for patents of their HF-System in Germany and the USA. Registration numbers of both patent offices had been received in August 2008.

Standard available options:

• Break In Procedure using our program which can be modified to meet our customers specifications
• Automatic Compression Release Valve starting with a cylinder capacity of 55ccm

• Manual operated compression release valve
• Engine Mounting Plate with a 4th. ball bearing, designed to accept a Bental or Sullivan alternator or alternator / starter unit.

• Rear out put shaft standard, but not applicable with rear induction engines
• TS-cylinder (Twin Spark) starting with a cylinder capacity of 55ccm
• Painted cylinders, standard with CS engines

Electric onboard starter: