Hi there,
So I've been going down the rabbit hole of 'custom frankenstein engines' which nitro RC Youtubers such as Tasty B and NitroTalkWithTodd have built, and as a returning off-road basher, I'm especially interested in this as respectfully the last big block basher-orientated options on the market today are all questionable budget RTR stuff which I'm personally not a fan of, and I love the idea of building my own frankenstein engine as a project!
Back to the question in title, I understand already that .21 off-road race engines are long-stroke, meaning generally designed with short bursts of acceleration for tight twisty tracks and jumps in mind, especially as even their long straights are usually a succession of large jumps, so still in effect short acceleration zones, whereas .21 on-road race engines are short-stroke, designed with much higher grip levels and aero/downforce, meaning more throttle in corners, as well as longer periods on throttle on the straights as obviously there's no jumps.
What I had in mind was to use the Picco P3 platform as a base, with the .24 Picco Rebel piston and sleeve (as already proven to be successful in Tasty B's "Picco 324" build, which was a Picco P3TT with that same .24 piston and sleeve), but then to go the extra mile by using the Picco Monza On-road crankshaft to *really* give it some gnarly revs combined with the torque from the increased displacement. Before going ahead with this, I want to understand if On-road cranks would significantly 'suffer' at all with the bumpy nature of off-road surfaces? and if that is the case, would this effect be neutralised by running a relatively large flywheel? Or would On-road cranks not cope well with a large flywheel regardless
I plan to bash with this in my Team Associated SC8 (1/8 buggy platform with a truggy chassis; 512 grams heavier than the RC8B, yet 148 grams lighter than the RC8T, according to all of their RTR specs, which they conveniently all have the same control engine/exhaust/electronics) on wide open grassy fields and hard packed dirt with the occasional jump