The Panther Model 100 was a British motorcycle. It had a 598 cc, 6.5:1 compression ratio, 87 mm × 100 mm (3.43 in × 3.94 in), OHV sloper engine in a frame where the engine replaces the front down-tube. Panthers were manufactured in Cleckheaton, Yorkshire from 1900 to 1967.
source/image: DLMmotorbikes
Launched in 1932, the Model 100 continued through to 1963. While the engine and overall layout stayed essentially the same, the specifications steadily evolved over these thirty or so years. In the spring of 1934 new engines were developed for the 1935 model year.
They featured a new heavily finned sump containing 3 ½ pints of oil. The timing chest was redesigned to accommodate the oil filler at the top of the chest rather than on the cover, which was now of totally smooth design.
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A 598cc engine was used in the Model 85 Redwing (previously Model 80) from 1929 to 1930 and the Model 60 (previously Model 3) from 1928 to 1935. The Model 100 engine was largely a development from the Model 60. The earlier engines had compression ratios of either 5.4:1 (Model 60 pre-1930) or 7.0:1 (Model 85 and Model 60 post-1929).
