[tjts1]

Originally Posted by cfg83

tjts1 -



That's a cool detail to know. I will look for this detail in the literature.

CarloSW2

It didn't even occur to me until I read it in a Mustang article.

The Duratec 3.7 V-6 is actually what the engineers call a "mild Atkinson-cycle" engine, where the variable intake valve mechanism keeps the intake valve open much longer than in a standard engine for better mixing in the chamber, thus reduced pumping work and better fuel economy.

Read more: 2011 Ford Mustang 3.7L V6 Engine - Muscle Mustangs & Fast Fords

"Mild Atkinson cycle"

First, the vehicle uses what he calls "mild Atkinson Cycle" combustion, which simulates a compression stroke that's shorter than the power stroke by leaving valves open during part of that stroke. This slightly reduces the power needed to pump air, improving its efficiency.

The Atkinson Cycle engines fitted to full hybrids run very efficiently at high speeds, at the cost of producing very little torque at low speeds. The hybrid's electric motor, which produces maximum torque from 0 rpm, neatly complements this.

Without an electric motor, the 2011 Explorer's engine can't run a full Atkinson cycle, but even shaving fractions from its pumping losses raises the power it generates from the gasoline it burns.

http://www.greencarreports.com/news/...id-tech-tricks