JAP DRAWINGS SURFACE
Well not so much ‘surface,’ as published for the first time. Quite a few years ago a roll of film, which had been found in the street, was handed in to the police in Wolverhampton. The roll was of over 700 microfilmed JAP drawings which had perhaps been dumped after Villiers took over JAPs and moved the remnants of the JAP Tottenham (London) factory to Wolverhampton.
Not being claimed or an owner found, and rather than being destroyed, the film was given to a friend of ours who allowed the Vintage Motor Cycle Club and the Morgan Three-Wheeler Club to copy them. The MTWC made digital copies and a copy was given to Loose Fillings some years ago.
The first set of three drawings published are of the 8/45 KTOR and JTOR crankcases of 1924 or thereabouts, probably with the later addition of ribs to the drive-side crankcase. There should be a timing cover for a single platform magneto but we have not found it yet. It may be that the drawing was lost when a new drawing was done for the 8/80 in 1936.
Future uploads will include the 1936 8/80 996cc JAP and the postwar Mk1 1098cc JAP used by Coopers. As well as crankcases there are cylinder barrel and head drawings of various types but no small parts – the collection is almost exclusively of drawings for moulding and machining of castings in iron and aluminium.
As well as twin-cylinder engine drawings there are many of the speedway 500 engine which will also be published. Note that the drawing number is the same as the JAP part number
So, watch this space, and here is the first being the 1924 and onwards crankcase for the JTOR, KTOR and probably the water cooled LTOW. Later, these drawings were amended for the 8/80 and in due course the 8/80 timing cover was amended in 1949 to suit the pump used for the dry-sump engine.
If you want higher resolution files, you can download pdfs from JAP DRAWINGS in the menu across the top of the page.
Above: Drawing 7405
Above: Drawing 7406
Above: Drawing 7439 for chain driven magneto
Here’s a list of the available motorcycle-type engine drawings which will eventually be published: