I'm maybe going to reveal a massive hole in my knowledge here... Why is a triple piston moving faster than an IL4 or a twin piston at the same RPM? Surely at equivalent RPM / bore / stroke the piston is travelling the same speed irrespective of configuration?
I’m no expert but my understanding is that it’s to do with bore and stroke relative to crank rotation, so a longer stroke will mean the piston is physically moving faster in its directional travel. Also, if you are getting to 675cc with 3 pistons they are bigger and heavier, that’s my understanding.
Anyway....be lovely seeing ducati back in the competitive classes but it will be a farce I fear. How many classes? SS, V2/triple, M2? What else?
Sorry mate I meant to say "means the piston is physically moving FURTHER for a given RPM, hence the M/s.. look it up on the workshop of something like that.
Yeah it's interesting. If the bore / stroke / rpm were same then I'd logically expect that the piston distance / speed would be the same. The mass of the reciprocating parts, thermal dynamics and forces would be different for different configurations (2, 3, 4 cylinders, v arrangement vs. inline vs. boxer etc.) which would influence the piston conditions for each scenario too. Logically I'd have expected a twin to be the most extreme as for a given displacement there are only two pistons to do the work, stroke tends to be longer, pistons have more mass etc. Never thought about it before... it's something else to occupy the mind.
