During a full engine rebuild, we modify the crankshaft for several performance gains. By knife-edging the individual throws, we both strengthen and lighten the crank. This allows the engine to rev up faster while still maintaining balance to reduce internal vibration. It also reduces windage in the oil in the bottom of the case, thereby reducing both friction on the throws and the potential for oil frothing. In combination with our other internal engine improvements, this helps the engine last much longer between teardowns.

In addition, we can make improvements to the connecting rods. By removing the casting ridge along the stress-bearing length of the rod and polishing the edges, we not only remove the potential for stress risers, which can lead to rod failure, but we reduce the reciprocating weight. The resulting gain in horsepower is another step to overall performance. Replacing stock rods with Carillo rods is yet another alternative.