Yep, I swapped recip. and rotate! The setup instructions for the balancing machine I used to use had a formula for calculating rod weights, and assigning a value for upper and lower weights when computing the bob weight amounts. It's been some time since I did my own balancing- - - -one of my former students manages a machine shop where I send all my balance work now, and he does a great job for me. I've found that the main advantage to a well-balanced engine is in smoothness of operastion and long life. The owner of one race car we set up got a piece of shift linkage upside down and had the transmission in 3rd. gear instead of 4th. on a sportsman car at the Nashville track one season-opening night. When the rev limiter started shutting him down at 7500 RPM, he maxed it out at 10,000, and commenced to run 4 laps around the 5/8 mile track with the limiter cycling and resetting between 9,500 and 10,000 5 or 6 times a lap. (No tach- - - -the cable was on backorder) We got him flagged down after 4 laps, and shut down for the rest of the night. On inspection, there was NO engine damage, not even a stretched rod bolt! We changed rod bearings and ran the engine all season with no problems.
Jerry
