It is a bit amusing to read : Some like to go for short stroke engines for getting high revs and high performance. Some like to go for extra long stroke - ah - for what benefit ? I got a 1935 Horex 600 four valve single with 103.5 mm stroke, had the first ride this year on Sunday. Yeah, great thumper at some 26 or 30 hp. But I would not want to punish it for extended times, forces in the engine getting unhealthy at higher speeds. I´d think a good combination of carbs, c.r. with a modern piston and unrestricting exhaust system should provide a lot of fun on twisting roads anyway.
I did complete crank webs as well , press fit parallel pins, main shafts integral. No need to nitride I´d say, get high tensile steel and they will do. Yes, machining is a laborious job, even more the grinding of the pin bore to a decent surface roughness with intergral main shaft. But a 40 mm pin in a high tensile crankweb is an extremely rigid assembly so due to this I had to apply my press to get run out from 0.06 mm after pressing in to less than 0.02mm , no copper hammer could do - or I was no longer strong enough to swing it hard enough at my age . . .
Vic
I did complete crank webs as well , press fit parallel pins, main shafts integral. No need to nitride I´d say, get high tensile steel and they will do. Yes, machining is a laborious job, even more the grinding of the pin bore to a decent surface roughness with intergral main shaft. But a 40 mm pin in a high tensile crankweb is an extremely rigid assembly so due to this I had to apply my press to get run out from 0.06 mm after pressing in to less than 0.02mm , no copper hammer could do - or I was no longer strong enough to swing it hard enough at my age . . .
Vic