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Old 07-06-2008, 02:33 PM   #8
Will
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Join Date: Nov 2001
Location: Gnaw Bone, Indiana
Posts: 6,478
Vehicle Year: 2007
Vehicle Make: Toyota
Vehicle Model: FJ Cruiser
I use this vehicle for: When I can't ride a motorcycle.
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Stroke means nothing when you are talking torque. I know lots of people think it does. The only important thing is how much fuel you can burn in a single combustion. Stroke doesn't help that, only displacement and airflow efficiency matters on a naturally aspirated gas motor.

What stroke does do is increase the airspeed at lower rpms, which helps fill the cylinder more quickly at low engine speeds. That's great for a truck motor like a 300-6, or a 5.4 or a 6.8. Stroke is not about leverage, it's about controlling piston speed. Most of the push of the piston is done near the top of the combustion chamber. A short stroke with a long rod would be the best at getting good leverage on the crank.

A stroker kit is good for adding displacement when you are out of room to overbore.

The 4.6 in the 2009 Mustang makes 1.14 ft# per cubic inch--as installed in the car. If you are going to take a 40 year-old technology and think you can come close to that, you are greatly mistaken. And that would only be 340ft#. The best the fuel injected 300 did was .88ft# per inch as installed, and the carbed ones were around .75 per inch.

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