From the archives. And BMS= The first Classic BSA Scene. Text reads as follows:
Four views of BSA's abortive 250 4-valve twin carb racing single, now in the Stanford Hall Museum of Important Motorcycles. A one off, supervised by development engineer Doug Hele and designed by out-going Bert Hopwood, it was to have appeared at Silverstone Saturday, Geoff Duke up, but the managing director of the day demanded a guaranteed win; faced with such an impossible dictum, Hele withdrew the entry. Bevels and a vertical shaft took the ohc drive to one camshaft which then drove the other. The valves were disposed radially. Hele went to join Goldie designer Hopwood returning to Norton in 1956.
As jeff mention , this bike was featured in the "best o British:BSA" video , a bit of history about it and and the designer as well as Geoff Duke and the had some footage of this beast roaring to life , an incredible sound from a britbike , engine was capable of 11,000 RPM if I recall ... I have no idea how to post to youtube or I'd post it.
Funnily enough this has been topical in the Geoff Poyners reminiscences in 'The Star'. In this months issue he covered his time with the MC1 under the direction of engineer Bill Bentley. At this stage (1952) the develpment was headed by Doug Hele who had taken over from Hopwood. To cut a long story short after many months of work they were up to 32 bhp at 11,000 rpm. Not bad for the day!
Re: 250 4 valve twin carb racing single- one off#30267 10/19/071:24 pm10/19/071:24 pm
the jist was , oil drain problems from rockerbox. Concerns over bevel drive bushings and gear pitch Under finned . Comp ratio too high for reliabile running on poor fuel available. Primary drive problems. It was not reliable in tests and BSA/ Hele dropped it without further developement.
Shame Cheers pod
71 Devimead A65 750 56 Norbsa 68 Longstroke A65 Cagiva Raptor 650 MZ TS 250 The poster formerly known as Pod
Re: 250 4 valve twin carb racing single- one off#30268 10/19/073:25 pm10/19/073:25 pm