Supercharged diesel Royal Enfield - One that didn't make it into production

Royal Enfields with Hatz diesel engines were sold in the UK by Charnville Classics of Coalville. In Ireland, Derek Rynhart of Rynhart Research and Development decided to supercharge the engine. Gordon May was able to ride one of the supercharged bikes and it efortlessly got to 70mph, some feat for a 350 diesel. 

Rynhart was determined to set a world speed record for a diesel motorcycle. Unfortunately things have taken a turn for the worse over the last year or so. Derek Rynhart told Dieselbike.net that he had been forced to call it a day and wind his company up due to the fact that his superchargers were too good. 

Combustion pressures of the Hatz 1B30 are 55bar but Rynharts supercharger put these up to 100bar which resulted in four broken crankshafts. 

The superchargers were O.K. on the bigger 1B40 engines but still there were problems.

The engines fuel pumps could not generate enough pressure to get the diesel into the chambers. 

It was with these problems in mind that Hatz told Rynhart they were not prepared to upgrade all of their engines to take account of the super chargers capabilities. 

Given that Rynhart managed to more than double the BHP of the 1B30, this is a shame for riders who ride 1B30 Hatz engined bikes. 

No doubt there are more details that may come out in time but those above give the main reasons why we will see no supercharged hatz motorcycles in the near future.