Hi all,
The all conquering Guzzis 350cc won 5 consecutives World Championships between 1953 and 1957, a period in keeping with the MAC design and lifetime...
Giulio Carcano, their designer/enginer/race head honcho, said that, most of the time, they had way less than 33 HP to compete with the others guys, HP obtained at great cost with a SOHC design of impeccable racing heritage, having started in 1926 as a 250 cc with an horizontal cylinder .
The period 350cc DOHC single Norton Manx claimed more than 35 HP, but, too high and too heavy, being a reduced size 500 ie wrong approach, never got near the Guzzis.
I would think to extract anything near 30 HP from a MAC with street gasoline would be a miracle unless umpteen hundreds of hard earned cash are spent on this project.
The Velocette flagship, the 500cc Venom Thruxton, highly tuned with special head, valves and carburettor was rated at 42 HP @ 6200rpm by the factory and capable in Veeline version of 115mph on a good day... Lets not quibble and agree they found a few more, say 45 HP on their winning Production TT racer, hit 120mph, that's it...
To get speed out of his MAC, I would suggest the HP approach will not be a success and ROTM will have to explore other avenues to get the speed he wants...
ROTM should look at Carcano's work to get speed w/o HP, ie lightness, friction reducing measures, fairings and low frontal set up, small section tyres, efficiency, weight distribution etc...
All things that don't need that many dollars to implement, but mostly brain power.
Patrick