1 post, and the thread does a ninety degree turn off topic !
Single cylinders used to be notoriously difficult to supercharge - the long dwell between intake gulps played havoc with the mixture strength,
and the plenum chamber needed to be large to accomodate enough mixture for the next gulp.
(Although there were some successful supercharged singles)
Twins and multis had less problems in this respect, feeding into smaller cylinders, more often as it were.
These days, fuel injection would readily take care of the mixture problems on singles, no black magic needed.
That Ajay supercharged V4 was always my fav-o-rite prewar what-could-have-been british racing motorcycle.
The story goes that Walter Rusk 'the blonde bombshell' of prewar racing discovered that the blower, being chain driven, could be made to spin faster with a change of sprockets. So he instantly demanded 'more puff'. On the old Clady circuit in Ireland, with its 7 mile long straight, he did the first ever 100+ mph lap of any racing GP circuit - and apparently those who saw him that day say he physically manhandled the bike to stay on the track, the power being considerably in advance of the cycle parts of the day - the frame was decidely spindly for the power.
He was denied a win though - the fork links broke (some say he broke them from applying sheer strength to steer it) - apparently it was accidentally fitted with touring fork links, not the extra strength racing versions they'd had made especially. Rusk died early on RAF duty during the war, so a postwar career was sadly denied, he was apparently considered a real star in the making.http://www.findagrave.com/cgi-bin/fg.cg ... d=15570593
Ajays had had a lot of trouble with cylinder head sealing with those V4s and the early air cooled versions - they didn't use enough head studs ? - even though they'd gone to water cooling to solve all the problems. So the V4 was never resurrected after the war - and the ban on supercharging effectively and eventually killed off the 2 cylinder porcupine racers. Honda remade/reinvented it as the V4 VF and VFR series, not slightly related though of course, to a runaway commercial success.
Sammy Miller has one - of the 2 ? surviving bikes, they didn't build very many - and still 'parades' it at classic race meets.
This bike would have to have a place as a contender as the best looking racing motorcycle of all time ?
Even though it was never fully developed, or really had the chance to win races.