Top end swap. 107 to 114.
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Joined: Dec 2005
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From: poway
Many factors play into how an engine will perform when it comes to HP and Torque, but I'd say piston stroke is heavily related to torque.
Think about it like this, stroke is determined by the crank offset (crank centerline to connecting rod position). Larger offset will have a larger rotational stroke.
Now think about this offset like a wrench. A longer wrench (or stroke as it relates to engines) will apply more torque to the working end than if you used a shorter wrench, given the same input force to each.
A shorter wrench can be spun more quickly due to having a smaller radius (RPM), but torque is reduced.
Just my opinion....
Think about it like this, stroke is determined by the crank offset (crank centerline to connecting rod position). Larger offset will have a larger rotational stroke.
Now think about this offset like a wrench. A longer wrench (or stroke as it relates to engines) will apply more torque to the working end than if you used a shorter wrench, given the same input force to each.
A shorter wrench can be spun more quickly due to having a smaller radius (RPM), but torque is reduced.
Just my opinion....
What does tend to favor generating more torque is longer rod to stroke ratio.. Using the same length rod it favors the shorter stroke.
A long stoke 114 ci motor say 4.015 x 4.5 or 4.25 x 4. bore and stroke. Displacement is essentially the same..
HDF Community Team
Joined: May 2022
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From: CA
Torque is leverage, and the peak leverage of a piston against the crankshaft is of course half the stroke. So if you increase the stroke you increase the leverage (torque) at a given wheel speed, increase the displacement, and reduce the rpm at a given piston speed.
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,859
Likes: 7,980
From: poway
Increasing displacement always increases torque not matter how you do it, bore or stroke.
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