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Old 09-01-2017, 03:19 AM   #6 (permalink)
Master EcoModder
Join Date: Jun 2010
Location: Australia
Posts: 253

Delivery 'Boy - '86 Suzuki Mighty Boy
90 day: 37.15 mpg (US)

SkipSwift - '13 Suzuki Swift GL
90 day: 35.44 mpg (US)
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If you combined a variable compression engine that uses a sliding piston in the head (to vary compression without affecting squish clearance) with a simulated atkinson-cycle (with VTEC engagement so you could still run normal cam timing in power mode) you could reap *huge* part throttle gains.

Remember the Prius engine is around 13:1 compression right now. I'm willing to bet that the only reason it isn't 15:1 (for better efficiency on a highway cruise) is because it would ping at full power (you could close the intake valve even later, but that would reduce max power further). With a variable compression engine and atkinson-cycle you could eliminate that shortcoming.

You would always be running the highest expansion ratio possible.

But that just mixed three patents from major companies that don't want you using their tech...

Originally Posted by Crazyrabbit
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