The new VR220/330 series engines have been created to modernize the division's Mobile Equipment, Industrial Power Unit, and Enginator Capability through the power range from 50 to 150 BHP. The design concept which followed was to make a family of engines having a good balance between Reliability, Cost of Manufacturing, Application Ease, Serviceability, and Engine Performance. The new VR220/330 series is a refinement of an earlier VR engine family manufactured at Waukesha. Features have been developed to meet the demands of the Mobile Equipment and Industrial Engine Markets.The VR220/330 engine series has a 3.875” bore, 4.665” stroke for a displacement of 55 cu. in./cylinder. The engine family consists of 4 and 6 cylinder Gasoline, Gaseous, Diesel, and Diesel Turbocharged models. The engine family was designed to utilize some existing tooling, along with currently accepted foundry techniques, and engine technology. Family concepts emphasized interchangeability between fuel types, and maximized commonality of internal and external engine parts for cost effectiveness, as well as simplifying service and maintenance.The paper is divided into 3 sections emphasizing Engine History, Design Section, and Development Program. Engine History covers the initial approach and rationale for the VR220/330 family. Design Section covers design philosophy used on major engine components and features. Development Program covers the steps used in obtaining good engine performance, and solutions to problems encountered.