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Originally Posted by AdamAshmore
The higher rpm comes from a lower crankshaft, rods, and piston weight as it is this weight that needs to be accelerated. An engine of the same size, but with more cylinders should rev more due to the individual piston weight.
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Piston weight, rod weight etc are all likely to be very similar - check this by reading elsewhere by all means (try Atlas Technical forum) but the prime reason that the new V8s will rev higher is shorter, lighter crank with reduced vibration problems.