Panther Model 100

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Panther M100 Motorcycle
Panther M100 Motorcycle

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. Panthers were manufactured in Cleckheaton, Yorkshire, UK from 1900 to 1967[1]. Launched in 1932, the Model 100 continued through to 1963. Whilst the engine and overall layout stayed essentially the same, the specifications steadily evolved over these thirty or so years.[2]

Contents

[edit] 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.[2]

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

[edit] Technical Information

[edit] Engine Numbers

Engine Numbers are of the following format[3] 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.

[edit] Detailed Technical Specifications

From "Modern Motorcycle Maintenance"[4]

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.

[edit] Carburettor Settings

Bike
Carburettor
Jet
Throttle
Needle Jet
Banjo/
Float Body
 Note Source
Year Spec Make Type Bore  Block Main Pilot Slide Cut-
away		 Jet Needle Grv.
1935 Solo Amal       220                 [5]
1938-45   Amal 89/014     220   29 /4  Std. T-29-Std 3   A,B [6]
1946-50   Amal 289C/1A 1 1/8" 229/069R 220   29 /3 Std. T-29-Std 3 64/156 A [6]
1951-53   Amal 289Q/1C 1 1/8" 229/069R 220   29 /3 Std. T-29-Std 3 64/156B A [6]
1954   Amal 289Y/1C 1 1/8" 229/069R 220   29 /4 Std. T-29-Std 3 64/156B A [6]
1955-56   Amal Monobloc 376/30 1 1/16" 376/057 250 30 376 /3 1/2 .106   2 376/098   [6]
1957-66   Amal Monobloc 389/21 1 1/8" 389/056 280 30 389 /3 1/2 .106 D 2 376/098   [6]
Notes
A - For Pre-monobloc carbs a Std. needle jet was .106"
B - Cutaway /3 option

[edit] Sources

  1. ^ http://www.pantherownersclub.com/PantherPage/ Panther owners club accesed 2008-05-04]
  2. ^ a b "The Panther Story" by Barry M Jones, Panther Publishing Ltd.
  3. ^ Panther Page Tech Specs http://www.pantherownersclub.com/PantherPage/p-ts-eng.html
  4. ^ "Modern Motorcycle Maintenance" by Bernal Osborne of Motor Cycling, Second Edition
  5. ^ 1935 P&M Instruction Book
  6. ^ a b c d e f Various - including Pitman's handbooks and Amal spec sheets

[edit] External links