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Crankshaft Developments In Race Engines - The Torque Starts Here

Crankshaft Developments For More Power And Durability From Your Race Engine
October, 2004
By Jeff Huneycutt
Photography by Jeff Huneycutt
Crankshaft Development Race Engine Outside Diameter
Most race crankshaft manufacturers... 
   
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Crankshaft Development Race Engine Outside Diameter
Most race crankshaft manufacturers prefer to balance with a smooth outside diameter. This means no holes drilled into the outside edge of the counterweights. Holes only increase windage. The solution is to turn the counterweights down to a minimum diameter and then add slugs of heavy metal to bring the crank into balance. In this photo, you can see three slugs of heavy "mallory" metal in the far counterweight.
Crankshaft Development Race Engine Pendulum Cut
Here's another look at pendulum-cut... 
   
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Crankshaft Development Race Engine Pendulum Cut
Here's another look at pendulum-cut counterweights. This design puts most of the counterweight's mass at the outer edge, which helps it mirror the center of mass of a piston on a long rod while still lowering the crank's overall weight.
Crankshaft Development Race Engine Main Bearing
Rick King of King's Crankshafts... 
   
  read full caption
Crankshaft Development Race Engine Main Bearing
Rick King of King's Crankshafts recommends a main bearing with a 31/44 oil groove. This means the oil groove covers 31/44 of the inside of the bearing, or 270 degrees. This provides better oiling to the crankshaft's main journals.

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