Quote History Originally Posted By xd341:
I could see it having a cross plane but if it does it probably won't be the 5.5. That motor is highly specialized to be an 8500 rpm flat plane. I doubt they would just drop a cross plane crank in the same engine. I'm not sure it would make it any more reliable anyway. Flat plane cranks are very strong.
My guess is it's the 5.5 flat plane with turbos.
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The issue with the flat plane is greater vibration magnitude, amplified by speed &/or load. Ferrari cut back the 488 TT motor to 3.7L to mitigate the problem.
Yamaha went with cross plane order in the R1 specifically to eliminate torque fluctuation from the previous 180° flat plane motor which smoothed its power delivery & helped mitigate traction loss specifically at lean angle. Different issue, but same underlying problem. With flat planes, the pistons effectively stop when they top & bottom out simultaneously, which sends a vibration pulse that travels down the drivetrain, & it rises exponentially with increased piston compression force &/or crank speed.
FP TT V8 is my ICE performance grail engine, so I hope it will happen & work reliably. Curtain is supposed to drop this summer, so we'll see.