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Actually, it could be either.
We simply need to understand that anything around10.1, will generate
an efficient engine, capable of converting the mass charge brought into
the cylinder, into power, at a rate favorable for good torque and hp.
Up around 15.2:1 on NA Engines, we are looking for a %VE (not VE%) of over 128% when
the intake valve closes, when the piston has begun moving past the intake cycle, and is
moving into the compression cycle.
The trapped compression on these engines is ~17.2:1.
Actual VE% is above 150%.
So an engine spinning 10,500 rpm, is inhaling air as if it was spinning ~15,500 rpm.
This then provides for an NA Engine the ability to produce about 3-fwHP / CID.
And here, with these FI Engine platforms, it's a big thing to produce 900 HP
from 376 CID. That's 2.39 HP / CID, using a blower.
Because these engines, including the roots blower, are very inefficient.
Raising the Static Compression Ratio will help, but we desire to do
that without moving the engine into self-detonation.
This then depends on the customer / owner making rational decisions. . . .