Originally Posted by 408wkash
Talk to Karl at Massive before you take Toms device. Alot of guys have done VERY succesful 2.5 builds with the 2.5 head revving to the moon.
With the 2.5 liter, due to it's high stroke (3.93), the pistons speeds are very high. Revving at 9000rpm the piston linear velocity will be at 30m/s, near Formula 1 engines.
Like Tom said, for a high revving 2.5 you'll need good forged internals and a dry sump, at least.
IMHO, even with forged internals a 2.5 revving this high will not last too much.
The force between piston and cylinder walls (high rod angle x high rpm) will be very high resulting in premature cylinder wear.