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On 16 Oct 2006 15:49:43 -0700, "basskisser"
wrote: CR wrote: "basskisser" wrote in message oups.com... CR wrote: Wrong. Low end torque is not enhanced by bore size as long as the overall displacement of the engine remains the same. Prove it. "Engine torque output is essentially related to cubic inch displacement of any engine. The RPM that maximum torque is produced at is related to the length of the stroke of any engine. A 230 c.i.d. "under-square" engine will make about the same torque as a 230 c.i.d. "over-square" engine but will do so at lower RPM due to its longer stroke." http://www.novak-adapt.com/knowledge...es_general.htm What you fail to realize, is that you need to think of the connecting rod as a lever. Actually... a longer rod does not change the force on the crank at all - the "lever" is the offset of the crank pin from the crank centerline - i.e. half the stroke. Basically, the rod isn't a "lever", it's a vector. The "leverage" doesn't change because the lever arm (crank throw) is fixed. What does change with a longer rod and less rod angle is the force vector. You can gain very slight efficiencies with longer rods, but the torque of an engine is primarily controlled, as CR correctly stated, with stroke. Other things have influences, but stroke is the primary mechanical factor. Oh, and obviously, a longer rod does not increase stroke. |
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