Relationship of Vibration Frequency to Order of Vibration
WARNING: This page is about a different car, the 2008 Ford RV Cutaway, 2008 Ford Econoline, 2008 Ford E450 Super Duty, and 2008 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
After carrying out the road test, the vibration was determined to be either vehicle-speed related or engine-speed related. That determination will identify the vibration frequency calculations that should be done.
| Vibration Type | Calculate |
|---|---|
| Vehicle-speed related | Tire-speed vibration frequency Driveshaft-speed vibration frequency |
| Engine-speed related | Engine vibration frequency Engine accessory vibration frequency Engine firing vibration frequency |
In calculating and using frequency readings, it is important to remember the direct relationship between Hz and RPM. One Hz is equal to 60 RPM. This is easy to remember by thinking of Hz as CPS. There are 60 seconds in a minute, therefore multiply the Hz reading by 60 to get RPM. Conversely, RPM would be divided by 60 to get Hz.
Use the Frequency and RPM Calculations Worksheet to calculate system/component frequencies. The worksheet provides the necessary steps to determine each system/component group frequency.