Hooked on dirt race gear10/25/2022 ![]() ![]() Such racers often monitor U-joint temperatures with the same heat gun they use to measure track temperatures. Remove the bind, or in other words have the correct pinion angle, and you’ll hit the tire harder because the suspension will move that much more freely. If we follow this logic to its final conclusion, then the reason racers see a difference in ET, reaction time, or 60-foot time with different pinion angles is that incorrect pinion angle is a form of bind and having this bind is a way to remove violence from the hook. For some, the reason for paying attention to pinion angle is so that we will reduce bind in the U-joints in the driveshaft. For these guys, pinion angle is used to adjust how hard they hit the tire on a launch. Yet before we leave the topic of what we call this adjustment, let’s understand that to many drag racers, particularly those with leaf spring rear suspensions, the words “pinion angle adjustment” often relates to a tuning aspect of their suspension setup. In doing so, we will be considering the entire drivetrain angle. We also need to consider the working angle at the opposite end of the driveshaft, where it meets the transmission output shaft. However, to look at this relationship as being only between the pinion and the driveshaft would be a mistake. A more correct term for this angle is to call it the “Working Angle” of the rear U-joint. One approach to reducing friction loss, as well as vibrations, is to focus on an adjustment we normally call “Pinion Angle.” We tend to think of this difference in the angles between the driveshaft centerline (CL) and the pinion gear CL. So if we’re going to be good racers, one of the many questions we must ask is, “What can I do to reduce torque loss due to friction in the drivetrain?” This is, after all, the force we use to move the car and no matter which class you run, the name of the game is to move the car. Naturally, no one likes losing torque after spending so much money and working so hard to create this rotating force. Depending on who you speak to, we lose 10- to 20-percent of our torque due to friction losses in the drivetrain. ![]()
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