Wulf engine Norton Villers

Oct 19, 2005
Country flag

The first modern multi-cylinder stepped piston engine, designed by Bernard Hooper whilst Chief Engineer of Norton Villiers Ltd. The engine was 500cc capacity producing 42 BHP at 6500 RPM, achieving a mean top speed of 103.15mph at the MIRA proving grounds. Group Chairman, Dennis Poore, insisted that the basic engine should be able to allow for a 750cc unit from the same engine block. This means that the 500cc unit shown is of course much larger than it would otherwise be. The air cooled Wulf shown above was further developed at BHE Ltd as a liquid cooled Wulf II unit in the interests of creating a low emissions two stroke engine with greater efficiency. The Norton Wulf, Wulf II and Norton 76 (new Commando replacement) are currently on loan to the National Motorcycle Museum at Solihull in England.

In January 1973 the ‘Mk.5 Fastback’ was launched and the ‘Long Range’ discontinued. In April the ‘Roadster’, ‘Hi Rider’ and the ‘Interstate’ all began to use a new 828 c.c. engine. Development work also began on a 500 c.c. twin, stepped piston engine, with a monocoque pressed steel frame. The new engine, called the ‘Wulf’, was dropped in favour of developing the rotary Wankel type engine that had been inherited from BSA.

Apr 19, 2011
handsome looking machine, the engine does not look out of place in their. I wonder if any modern manufacture will pick up on the new two stokes used in outboards, I have one in an Evinrude, that is claimed to use less oil than an equivalent four stroke, assuming you change the oil and need to dispose of? The engine uses voice coil actuated injectors directly in the head, so no fuel enters the crankcase, just air and oil. Runs about 300:1 fuel oil ratio, is torquey and runs without a batttery.

Cheers Richard


Nov 20, 2004
Country flag
hobot said:
In January 1973 the ‘Mk.5 Fastback’ was launched and the ‘Long Range’ discontinued.
There wasn't a "Mk.5 Fastback"-as the Fastback model was discontinued for 1973.