Panther Model 100
The Model 100 Panther motorcycle is the quintessential Panther. It had a 598cc, 6.5:1 compression ratio, 87 x 100 mm, ohv sloper engine in a frame where the engine replaces the front down-tube. Launched in 1932, the model continued through to 1963. Whilst the engine and overall layout stayed essentially the same, the specifications steadily evolved over these thirty or so years.[1]
Development
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). The frame derives from the 1928 Panther and the tank from the 1932 Model 50. The history of the development of the Model 100 is as follows.[1]
- 1932 - Model 100 launched. P&M 4-speed gearbox, Webb forks.
- 1933 - Sturmey-Archer 4-speed, hand-change gearbox introduced. Frame redesigned. Terry de luxe saddle.
- 1934 - Burman 4-speed foot-change gearbox introduced
- 1935 - Engine improvements - finned sump, better lubrication
- 1936 -
- 1937 - New fully chromed fuel tank with red and black lined cream panels and snarling Panther logo
- 1938 - Kidney-shaped rocker cover introduced. Redwing designation dropped
- 1939 - Miller Dynamag replaces BTH magneto. 3.5 gallon tank introduced
- 1940 - Production ceased for war
- 1946 - Production resumed after war. Lucas magneto introduced.
- 1947 - Dowty Oleomatic forks introduced
- 1948 -
- 1949 - Very little change
- 1950 - Manual advance/retard reintroduced
- 1951 -
- 1952 - Lucas Magdyno introduced
- 1953 - Very little change
- 1954 - Swinging arm Model 100 introduced. Four gallon tank. Panther forks.
- 1955 - Amal 376 introduced
- 1956 - Amal 389 introduced. Heavy duty, sidecar trail Panther forks.
- 1957 - Swinging arm Model 100 de luxe introduced. Last year of rigid Model 100. Dualseat as standard.
- 1958 -
- 1959 -
- 1960 -
- 1961 -
- 1962 - Standard Model 100 last manufactured
- 1963 - Model 100 last manufactured. It was the end of the line for 600cc four stroke heavyweights. The 650cc Model 120 continued for another three years
Technical Information
Engine Numbers
Engine Numbers are of the following format[2] yyMxxxz where:
- yy stands for the year of manufacture (add 40 if it is a single digit),
- M is the definitive code for a Model 100. Other letters may follow the M:
- MS (pre 1957) MSN swinging arm, half-width hubs
- MS (post 1957) de-luxe
- xxx stands for the serial number, and
- z stands for the modification code.
Detailed Technical Specifications
From "Modern Motorcycle Maintenance"[3]
- Tappet Clearance (cold)
- Inlet, nil.
- Exhaust, nil.
- Valve Timing
- Inlet opens before T.D.C., 25 degrees.
- Inlet closes after B.D.C., 55 degrees.
- Exhaust opens before B.D.C., 70 degrees.
- Exhaust closes after T.D.C., 30 degrees.
- Tappet Clearances for Valve Settings
- Inlet, nil.
- Exhaust, nil.
- Ignition Advance
- 38 degrees full advance.
- Valve Guides Protrude from Cylinder Head
- Inlet, .71875 in.
- Exhaust, .71875 in.
- Cylinder Bore in Inches
- 3.4253 ins. +0005 in.
- Rebore to plus .010 in. when bore exceeds 3.4303 ins.
- Piston Clearances
- Top land, .021 in. to .0225 in.
- Top skirt, .0036 in. to .0041 in.
- Bottom skirt, .0036 in. to .0041 in.
- Piston Rings
- End gap, .010 in.
- Vertical play, .001 in. on all rings.
- Main Bearings
- Driving side: R. & M. LJ. 1 1/8 in. (2).
- Timing side: R. & M. LRJ. 1 1/8 in.
- Mainshaft
- End float, .030 in.
- Big-end/Connecting-rod
- Side play, .030 in. to .035 in.
- Big-end Bearing
- Type: Hardened steel, double roller.
- Recondition when noisy.
- Gearbox
- Bearings, types and sizes:
- 52mm by 20mm by 15mm.
- 72mm by 1 1/2 ins. by 17mm. Ball races.
- Bushes, (reamed): .9355 in.+.001 in.; .656 in.+.001 in.; .788 in.+.001 in.
- Fine-limit Diameters
- Connecting-rod: Little end(reamed), .876 in. + .0005 in.
- Camshaft bushes, .. .625 in. + .001 in.
- Tappet guides .. .. .3125 in.+ .0005 in.
- Cam-followers .. .. .375 in. + .0005 in.
- Note
- All rocker-box screws are same length with the exception of the centre screw over the push rod tube. If this is inserted in a wrong position there is a danger of cylinder-head breakage when tightening down.
- Left-hand Threads
- Large dynamo driving sprocket. (pre 1950 models).
- Special Tools Available from Makers for Comprehensive Overhaul
- Dowty fork key.
- Clutch nut key.
- Engine sprocket remover.
- Crankpin and engine shaft nut key.
- Main pinion extractor.
- Ball race fitting tools for frame.
- Tappet stud extractor.
- Exhaust nut spanner.
- Valve removing tool.
- Fork ball fitting tool.
Carburettor Settings
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Float Body |
Note | Source | ||||||||
| Year | Spec | Make | Type | Bore | Block | Main | Pilot | Slide | Cut-
away |
Jet | Needle | Grv. | |||
| 1935 | Solo | Amal | 220 | [4] | |||||||||||
| 1938-45 | Amal | 89/014 | 220 | 29 | /4 | Std. | T-29-Std | 3 | A,B | [5] | |||||
| 1946-50 | Amal | 289C/1A | 1 1/8" | 229/069R | 220 | 29 | /3 | Std. | T-29-Std | 3 | 64/156 | A | [5] | ||
| 1951-53 | Amal | 289Q/1C | 1 1/8" | 229/069R | 220 | 29 | /3 | Std. | T-29-Std | 3 | 64/156B | A | [5] | ||
| 1954 | Amal | 289Y/1C | 1 1/8" | 229/069R | 220 | 29 | /4 | Std. | T-29-Std | 3 | 64/156B | A | [5] | ||
| 1955-56 | Amal | Monobloc 376/30 | 1 1/16" | 376/057 | 250 | 30 | 376 | /3 1/2 | .106 | 2 | 376/098 | [5] | |||
| 1957-66 | Amal | Monobloc 389/21 | 1 1/8" | 389/056 | 280 | 30 | 389 | /3 1/2 | .106 | D | 2 | 376/098 | [5] | ||
- Notes
- A - For Pre-monobloc carbs a Std. needle jet was .106"
- B - Cutaway /3 option
Sources
- ^ a b "The Panther Story" by Barry M Jones, Panther Publishing Ltd.
- ^ Panther Page Tech Specs http://www.pantherownersclub.com/PantherPage/p-ts-eng.html
- ^ "Modern Motorcycle Maintenance" by Bernal Osborne of Motor Cycling, Second Edition
- ^ 1935 P&M Instruction Book
- ^ a b c d e f Various - including Pitman's handbooks and Amal spec sheets