August 2026 - SAM Tech

For decades, machinists and engine builders have been taught that when balancing a crankshaft, its counterweights should equal 100 percent of the rotating mass and 50 percent of the reciprocating mass. Machinists have used this formula to calculate bobweight for decades. While this technique works extremely well for the vast majority of both street and race 90-degree V-8 engines, the truth of the matter is that it’s nearly impossible to perfectly balance a crankshaft. That’s because the balancer cannot account for variables such as cylinder pressure, ring drag, rod length, counterweight phasing, engine rpm, stroke length, bearing friction, secondary vibrations, rocking Read More