Petter M type 5 horsepower - Chronological table of main changes |
This table is intended only as an "at a glance" summary. For the detail please follow the links in the table headings and cells.
Year |
Petter Model |
Bearings and lubrication | Fuel system | Magneto | Flywheels | Exhaust pot | Base tank/ Crankcase | |
| 1913- 1914 | Petter Junior | Flat or Doughnut for tank cooling. Blade type piston deflector | Greased mains. Splash for big end. Straight glass oiler. Cylinder oiler fitted to boss in crankcase side | Single chamber with float | CAV and others. Perhaps including Bosch ZE1 and Simms SF1 | Twin spoked -crowned or flat. Single or twin solid. | Fabricated | small
filler, large bolt holes Arch base with bed cover. Oiler boss |
| 1915 | Fully cooled "Jellymould" head | Carb overflow to fuel tank added then overflow re-routed to Carb drain cock | Thomson-Bennet AC1Z | cast - small flange | ||||
| 1916- 1917 | twin chamber Carb for fuel/oil | twin chamber Carb for fuel/oil | ||||||
| 1918- 1922 | "Victory"
Half-cooled Paraffin head Ramp piston deflector |
Cast iron Oil pot replaces second Carb chamber | Later style Carb and Patent diaphragm pump | Thomson-Bennet AC1 | Base mounting holes reduced to 1/2". Oiler boss disappears | |||
| 1923 | 1922 model | Half-cooled Paraffin head | Oil from pressurised double dripper (early - late) fed to each main , and thence to crankpin by main journal scrolls and web drillings | Solid flanged base introduced | ||||
| 1924 | 1923 model | Appletop hopper added to range | Ring oiled mains. Crankpin fed from starting side main by single scroll and web drilling. Cast iron Oil pot | BTH T-B1 Wico EK appears briefly. |
Cast interim | |||
| 1925- 1929 | "Handyman" model introduced | Oiler changed to Wineglass style | BTH M1 | Cast - bolt top. reversible flange | ||||
| 1930 | New model - Universal petrol and paraffin engine | Petrol-only head with optional paraffin ring. | Retained ring-oiled mains | Petrol only option without drain | BTH AF2 or 4 | |||
| 1931- 1940 | Cistern hopper added to range in 1935 | Ball and Roller main bearings. Crankpin supplied by Calibrater through main bearing housing to crankshaft oil gallery. | Common with S type: Large filler and S type lift pump bosses at rear |
