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Originally Posted by sourbastard
The old rule of thumb "1 horsepower per cubic inch" is usually measured at the flywheel.
Once the head is ported & shaved, exhaust is flowing, once the cam, stall and diff ratio is set, once injectors and ECU are done, you are only left with a few factors left. Some can be addressed such as intake manifold and TB size, but you cant beat things like cubic capcity and the stroke, which in the end will be what will hold back larger numbers in NA form. |
On that basis, the Nissan shouldn't be able to produce 221KW(287bhp), as it only 215 cubes. I can tell you that it is not a highly strung motor and there are other motors that produce much higher specific power per litre(think M3, s2000 etc).
Its all just a matter of time before someone unlocks the potential of the I6 and i'm hoping useless finds the key to it.