What is the correct clearance of the dynamometer side rollers to the sidewall of the drive tires?

The correct clearance of the dynamometer side rollers to the sidewall of the drive tires is 3 to 5 inches for all vehicles, unless specified otherwise. This clearance is essential for the safe and effective operation of the dynamometer during the emissions testing process.

Maintaining this specific distance helps ensure that the rollers can rotate smoothly without causing any unintended interference with the vehicle’s tires. Adequate clearance also minimizes the risk of damage to both the vehicle and the testing equipment.

In situations where the rollers are too close to the sidewalls, there is a potential for tire contact, which could disrupt the testing procedure and affect the accuracy of emissions readings. The specified 3 to 5 inches serves as a standard guideline to promote safety and reliability in testing practices.