The HDT motorcycle diesel engine is based on stateoftheart highspeed automotive diesel engine technology, engineered into a complete power unit suitably sized and packaged for installation in a compact onoff road motorcycle. The basis of the design is a technology demonstrator program for a motorcycle diesel engine carried out by Cranfield University in the United Kingdom. Details of this program are reported in SAE Paper 982051. The aim is to produce the best possible power and torque without the need for turbocharging. To achieve good power, an advanced, thermally robust, freebreathing four valve cylinder head is used, in combination with an indirect injection combustion system and intensive development and tailoring of the fuel injection characteristics. Indirect injection also gives lower combustion pressures enabling lighter engine construction, less ‘diesel knock’ and low particulate emissions. The engine is of conventional mechanical design, optimized for this particular application. Lightweight reciprocating components give minimum vibration and reliability is assured by good design, high duty materials and advanced manufacturing techniques.

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