28-04-13, 07:23 AM
(This post was last modified: 28-04-13, 07:24 AM by MightyClown.)
with a perfect engine we would have fully variable intake trumpet length, cylinder compression, intake valve timing, exhaust valve timing and exhaust length. An engine is a mechanical pump really and as we can't adjust many of those attributes the engineers have to optimise for a specific operating characteristic.
What we can do is alter some of those parameters though , like honda with opening a second set of intake vales (vtech) , benelli with the intake trumpet change (lifts the 'cone' of the top) and putting valves in the exhaust to alter the back pressure.
I do look forward to the day when we have pneumatic valves, forced induction (turbos will return!) and variable exhaust capability to give us a motor able to operate at it's most efficient capability over a wide rev range.
Right now bikes are built as leisure devices and the requirements for fuel economy are secondary to power and basic marketing requirements. In 20 years i think we'll be riding smaller (400cc?) engines yet generating more power and we'll go fully automatic, we'll have a gear shifter and clutch - just they won't physically do anything as the computer will control the gear control as i think we might have more gears to allow the engine to remain in a specific rev range for efficiency requirements.
Keep the Exup.