BassVirolla wrote: ↑17 Sep 2025, 18:13
Tommy Cookers wrote: ↑17 Sep 2025, 14:46
... but a 120 deg V6 is possible with paired firings so behaving like an inline 3
(exhaust pulses arriving at the MGU-H/turbo at the ideal 240 deg intervals)
Why not a single turbocharger? Nothing not solvable with a hot V, I think. Even if the "twin 3 inlines" is not ideal (which a 90⁰ V6 also is not), I cannot see any inconvenience with a flat plane V8.
an exhaust pressure pulse is productive for about 240 deg rotation and counterproductive for about 60 deg rotation
so 3 cylinders (per bank) is ideal in capturing high pressure and 2 or 4 cylinders (per bank) is inferior
a V8 90 degree bank angle having 3 exhaust pulses per rev per bank at equal (240 deg) intervals - any familiarity ?
2 crankpins for 2 conventional-intervals firings & 2 paired pins for (1 conventional-interval) simultaneous firing it is ..
like a V12 cut down to V8 (though of course that would give some engine frequency vibration)
but 90 deg bank angle & counterweighting gives no engine frequency force imbalance (ok a bit of moment imbalance)
yes (like the conventional flat-crank V8) there's a (smaller) vibration at twice engine frequency
the engine might only need 4 main bearings and 6 crank throws
all this assumes people want to maximise turbine work ...
eg for a so-called MGU-H or enabling leaner running than hitherto (this might depend on a higher explosive range fuel)
anything with a wastegate or a multiple-entry nozzle isn't trying to maximise turbine work