The Panther Page

The Bikes: Heavyweights

The Models

{On 30/04/00 I broke up the unweildy single page on heavyweights into this collection of smaller pages on each stage of the development of the marque. There will doubtless be some teething problems - I anticipate many broken links between models - please aleert me to any you find. The boundaries between the various stages are somewhat arbitrary - especially between the P&M "Panther" models and the subsequent models of the Panther marque. I'll do this a little more rigorously as the site develops. It's a little untidy at this stage - bear with me!}

The first Panthers were the 1.75 h.p. Phelon & Rayner machines produced from 1901 to 1903.

The design was licensed to Humber who produced 2.75 h.p. and 4.5 h.p. machines from 1903 to 1905.

After disputes with Humber over licenses and royalties Phelon & Moore started producing a range of P&M machines from 1904 through to 1925. These included 2.75 h.p., 3.5 h.p. (solo, sidecar and forecar), 4.5 h.p. and the 3.5 h.p. Colonial and RFC/RAF models.

From 1924 through to 1935 P&M produced various models with the name Panther. The models that I am (somewhat arbitrarily) considering to be P&M Panthers are the 1924-29 Panther (including Models 1 to 3), 1930-35 Panther 50 and Panther 55, 1932 Panther 70 Express, 1929-35 Model 60 and 1929-35 Model 80 and 85.

From 1925 through to 1929 P&M produced various racing models.

From about 1929 the marque became known as Panther. The various Panther models post 1930 are treated separately.

From 1931 to 1938 a 490cc Model 90 was made.

From 1938 to 1939 the Model 95 (a vertical engined version of the 1938 Model 100) was made. This is a rare machine.

The definitive Panther is the Model 100, manufactured from 1932 through to 1963.

The final Panther heavyweight model is the Model 120, developed from the Model 100 in 1959 and sold through to the demise of P&M in 1966.

The Engine

Name - M100ENG.GIF, Source - Unknown, Size - ~17kThe defining feature of the heavyweight Panthers is their engine. The design of motorcycle with a large single cylinder engine as a stressed member spanned the entire history of the company, starting with a 500cc model and ending with a 600cc model (Model 100) and a 650cc model (Model 120). This is a black and white line drawing of the classic large single engine. The cutaway drawing shows clearly details of the valve gear and the timing side. The Burman gearbox and Amal carb are also shown. My guess is that this is a mid fifties Model 100 engine (well I used this picture when I was building the engine in my mid fifties Model 100 - so it had better be!). The Amal Concentric rather than Monobloc carb would provide a latest date (which I will look up sometime real soon!). The engine is a stressed member in the frame and the brackets on the head where this attaches below the frame headstock are clearly visible. The engine has a semi wet sump as can be seen from close inspection of this picture. The prominent finned part of the crankcases at the lower front forms an oil tank as part of the engine. The flywheels do not run in this oil however; there is a weir separating them from this oil reservoir. Oil return is provided by the flywheels flinging oil over this weir. The oil pump is located behind the large pinion in the timing chest. The magneto (Lucas K1F) and dynamo (Lucas E3H ?) are mounted one above the other on top of the crankcases behind the cylinder. The magneto (the lower of the two) has manual advance/retard. There is a chain drive to the dynamo. Behind the lower pinion in the timing chest are the cams and the cam followers, tappets and push rods are visible.

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