Ronald Valentine Engines

The finest miniature engines in the world

Ruppart Opposed Twin
Ruppert Opposed Twin 7.5cc Diesel Engine

Technical Data:



Bore                              17.0 mm
Stroke                           16.7 mm
Rpm                           12,000 rpm
Power                             0.8 Hp
Total combustion            7.5 cc
Weight                           460 g
Intake                          rear drum


Mr. Ruppert was the designer of these engines. Webra Manufactured them under license for about one year. The engine was too expensive and the Webra crank shafts weren't manufacture properly. The Ruppert's were far better. Mr Ruppert repaired many of the opposed twins manufactured by Webra in Berlin


1956 Ruppert Opposed Twin Diesel Engine

1956 Ruppert Boxer 7.5cc 

Ruppert Opposed Twin 7.5cc Mk II

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