TIME­LINE: M SERIES & MORE

Real Classic - - Velocette Mac -

1931: EU­GENE GOOD­MAN ex­per­i­ments with the Model M. In­tended to be cheaper than the cammy K-series, it was a 348cc side­valve which proved too slow for Ve­loce’s cus­tomers 1934: MAC in­tro­duced with longer 96mm stroke, giv­ing 349cc. It out­put 14bhp at 5000rpm and reached 70mph 1937: AUTO AD­VANCE / re­tard ig­ni­tion tim­ing in­tro­duced on all three M mod­els 1948: DOWTY OLEO­MATIC forks re­place Webb gird­ers. Front brake on MOV and MAC in­creased to 7”. MOV (to­tal pro­duc­tion c4500) and MSS dis­con­tin­ued at the end of the year 1952: SWING­ING ARM rear sus­pen­sion ar­rives, with twin Wood­head­Mon­roe shocks, re­vised gear­box, new frame, dual seat and fuel/oil tanks 1955: A SPRING-FRAME al­loy-en­gine MAC (15bhp at 5500rpm) was speed tested and reached 79mph 1958: VOLT­AGE REG­U­LA­TOR re­lo­cated to un­der the sad­dle. Venom/Viper oil tanks and var­i­ous brack­ets strength­ened 1960: MAC DIS­CON­TIN­UED: pro­duc­tion to­talled c25,000 over 27 years. Club­man mod­els launched for pro­duc­tion / en­durance rac­ing 1964: CUT-PRICE ‘spe­cial’ edi­tions of Viper and Venom in­tro­duced 1967: MARK II ver­sions of Club­man mod­els fea­ture 2ls front brake and other high per­for­mance com­po­nents from the Thrux­ton 1970: FI­NAL THRUXTONS use Amal con­cen­tric carbs. Mo­tor­cy­cle pro­duc­tion draws to a close

1933: THE HIGH-CAM en­gine ar­rived as the 68mm x 68.5mm 248cc MOV (type M, over­head valve) with en­closed valveg­ear and geardriven cams. It out­put 12bhp at 5000rpm and reached 67mph

1935: MSS in­tro­duced with big­ger 81mm bore, giv­ing 495cc. It out­put 28bhp at 5000rpm and reached 80mph

1946: THE FIRST peace­time pro­duc­tion ma­chine built at Hall Green was a 350 MAC in March

1951: HY­DRAULIC FRONT forks re­place the air-as­sisted Dowty setup. Sig­nif­i­cant en­gine up­date mid-year: al­loy cylin­der and bar­rel, im­proved lu­bri­ca­tion, higher com­pres­sion, re­vised cams

1954: MSS REIN­TRO­DUCED with an 86mm x 86mm all-al­loy en­gine giv­ing 499cc in a springer frame. It out­put 27bhp at 5500rpm and reached 82mph

1956: VIPER 350 & VENOM 500 in­tro­duced; Viper much shorter stroke than MAC. Out­put 27bhp and 36bhp for 90mph and 102mph. MAC and MSS adopt Amal Monobloc carb and head­lamp cowl

1959: EN­GINE EN­CLO­SURES in­tro­duced on MSS, Viper and Venom

1961: VEELINE full fair­ing in­tro­duced. Venom Club­man Veeline main­tains 100mph for 24 hours. New fuel tank for Club­man mod­els. New high-out­put Miller dy­namo

1965: EN­GINE LU­BRI­CA­TION mod­i­fied to ad­dress wet sump­ing prob­lems. Hand-built top-spec rac­ing Thrux­ton 500 model in­tro­duced; 41bhp at 6200rpm and 115mph

1968: COIL IG­NI­TION adopted. Fi­nal Viper built: pro­duc­tion to­talled c3700

Newspapers in English

Newspapers from UK

© PressReader. All rights reserved.