Obviously getting your hands on a p400 would be best in the upper ranges.
True, and they dont come anymore balanced than any other engine. I would love to see the broken crank p400 if you have any pics or links to read about.
Come spring I'm gonna pull my engine for a refresh, head studs, timing gearset, and a new Bull Moose pump. While I'm into this I'll have to make a decision on squares or diamonds. I have diamonds on now but I have 3 sets of Optimizer heads with squares. Want to use the best ones.
Pushing the fuel to the sides so it doesn't have good exposure to oxygen to efficiently combust is essentially putting the flame out (at least part of it). Too small of precups cause localized regions of rich fuel condition in the chamber, causing high egts, excessive smoking, and poorer efficiency for high fueling applications.But the flame isn't being put out. It's just been moved to the walls of the chamber.
Yeah it's only .3cc, and that doesn't sound like much. But a fair portion of the fuel will have been vaporized by the time it's moving through the throat (thus taking up more volume). And beyond 3,000 rpm, that amount of fuel has to move through the precup throat very fast (at 3,000 rpm, the injection event happens 25 times per second. taking into account the 4 stroke cycle, 25 injections of fuel has to move through the precup throat in about a quarter of a second total). Add on top of that high boost from a big ole turbo, and there is a lot of mass that has to move through that little hole in a fraction of a second.After all the most I've seen is 300cc which is only .3cc per injection event.