Ok, close your mouth and take a deep breath through your nose. Now exhale quickly through your mouth. Get the feeling? Now take another deep breath and place a plastic straw between your tightly closed lips. Now exhale through the straw. We'll call that exhaust (we could do it the other way, with two straws in your nose and call it headers, but that could get messy). Now just breathe in through your nose and out through the straw while you read on.
I'm not an engineer, but you'll see my point. To my simple way of thinking, your Power Stroke is just a big pump. It sucks in fuel through one hole, air through another; they mix and miraculously explode all by themselves,
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pushing you down the road. The more air and fuel, the bigger the explosion.
We increased our intake of air on The Turtle V by trashing the factory paper filter with all its plastic boxes, and adapting a K&N RE-0870 round tapered high-flow washable filter. The engine's intake air temperature sensor was reinstalled. The designers at International furthered our efforts by compressing the air with an efficient turbo charger, and pre-cooling it through the inter-cooler to make it more dense. By the time you read this, K&N may have a full air filter kit for the Power Stroke. They keep promising.
Fuel flow is not something we can do much about,
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except with our right foot.
The sophisticated electronic Power Stroke fuel injection system delivers just the amount the engine needs under a given situation. No more black smoke! No wasted Diesel. Having eight big cylinders to handle that fuel gives the Power Stroke its awesome horsepower and torque. For The Turtle Expedition, the reliability of our engine is far more important that a few extra pounds of torque, so we cautiously stay away from chips that might jeopardize that reliability.
There is, however, one other element to this system; exhaust, like the one you're holding in your lips. It doesn't take a rocket scientist to see that with more air and fuel feeding
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