Amalgamated Ariel (Ron Gardner) Ariès VT Arnott (JAP) Azzariti (Benelli) Battlogg, Stefan (Porsche) Bellini Bignan BMG see: Velocette BMW 2-valve (Franz Pohn) BMW 4-valve (Franz Pohn) BMW R1 BRM (British Racing Motors) Brüdersdorf, Roland Capriolo (system à la R. Küchen) Cenna (old story) Cenna (new story) Cosworth Daimler Benz & Co Decuir Delage GP DEMM DUCATI Factory line 1956 - present time Ducati 125 GP-triple nocker Ducati 1 cil. production desmo's (1968 - 1975) Ducati 250-GP-Twin Ducati paralleltwins Ducati Bevel-gear L-twins Ducati Pantah-line Ducati Four-valve L-twins experimental Ducati Four-valve L-twins old generation Ducati Four-valve L-twins new generation Testastretta Ducati Four-valve L-twin 1098 evoluzione Ducati Four-valve L-twin Panigale Ducati new generation aircooled L-twins Ducati new generation liquidcooled L-twins ST3(valve) Ducati Desmosedici L-Four Twinpulse GP-engine Ducati DVT-head DUCATI Non-factory line (private projects) Ducati Bellini, Paolo 4valve desmo 1 cil. (speedway) Ducati Del Biondo 4valve desmo 1 cil. Ducati ErLa Ducati Mazzucato, Carlo (speedway) Ducati Gerrit Rook Special (Ice-speedway) Schönenberg (Norton) Miscellaneous ESO Ferrari F1 GP Fiat 401 in tipo 801 Honda experimental Horak Howarth JAP Küchen, Richard see: Neander Lantenhammer, Otto Lau Foo Wah Mangoletsi Maserati 6 cil. Maserati V8. Mercedes-Benz (W-196 + 300 SLR) Michel-Aviation (AM-16 Aero-engine) Miller Minarelli : See Arturo Serri Mondial 175 Morini Motom : See Arturo Serri Moto Guzzi (Hans Peter Länge) MV Agusta 125 cc desmo double knocker Neander (system Küchen) Nerio Pancaldi Norton Manx (Doug Hele & Joe Craig) Norton350(Harry Hinton) Norton 350 (Bryan Thomas) NSU (Ultramax) (Willi Hartung) Orionette OSCA (Maserati 372 DS) Packer Special American Board Racer Pattakon Peeren, Frits & Cees Fick Pohn, Franz : see BMW Porsche 753 GP RudgeDDS (David Downer Special) Scarab (Reventlow) Schneider (system Michaux) Serri, Arturo Takegawa Honda Monkey Special Tehuelche Toyota F1-research engine Treen 350 cc research engine Unknown Tractor (1904) Vagova (Vareille) Velocette (patented by BMG)