![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjndFf3M6iuGBzob8EPzQh2mcuW0a6eMzXoqLxVgEbT1rpCN_ErHjCXYrO5eXKB61OD-5RVnoS5M_Fmv2vPpVxt76bZJTiBtzv-uPU1ufMC-oElo5kQ1vZHFb9goko8BnoxZpI7_TebdT02/s1600/4.jpg)
11 Nov 2014
Velobanjogent #2
Amazing project on the Velobanjogent
The Velocette ROARER : (1939)
A supercharged twin cylinder racing bike aimed at winning against
the supercharged contemporary BMW.
One single prototype was manufactured.
2 vertical cylinders, 4 stroke, OHV, 2 carburators
2 parallel contra-rotating crankshafts, geared together
(a technical layout which will inspire the Model O)
Cylinder : 497,7 cc (Bore : 68 mm ; Stroke : 68.25 mm)
Compression rate : 8.78/1 then 7.5/1
Boost pressure : 4 psi
Measured engine power : 54 bhp
3 plate clutch
4 ratio gearbox
shaft driven
I think the new pictures are a replica build but I'm not sure.
Go read the Velobanjogent blog to find out! :)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjndFf3M6iuGBzob8EPzQh2mcuW0a6eMzXoqLxVgEbT1rpCN_ErHjCXYrO5eXKB61OD-5RVnoS5M_Fmv2vPpVxt76bZJTiBtzv-uPU1ufMC-oElo5kQ1vZHFb9goko8BnoxZpI7_TebdT02/s1600/4.jpg)
The Velocette ROARER : (1939)
A supercharged twin cylinder racing bike aimed at winning against
the supercharged contemporary BMW.
One single prototype was manufactured.
2 vertical cylinders, 4 stroke, OHV, 2 carburators
2 parallel contra-rotating crankshafts, geared together
(a technical layout which will inspire the Model O)
Cylinder : 497,7 cc (Bore : 68 mm ; Stroke : 68.25 mm)
Compression rate : 8.78/1 then 7.5/1
Boost pressure : 4 psi
Measured engine power : 54 bhp
3 plate clutch
4 ratio gearbox
shaft driven
I think the new pictures are a replica build but I'm not sure.
Go read the Velobanjogent blog to find out! :)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjndFf3M6iuGBzob8EPzQh2mcuW0a6eMzXoqLxVgEbT1rpCN_ErHjCXYrO5eXKB61OD-5RVnoS5M_Fmv2vPpVxt76bZJTiBtzv-uPU1ufMC-oElo5kQ1vZHFb9goko8BnoxZpI7_TebdT02/s1600/4.jpg)
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