Relationship of Vibration Frequency to Order of Vibration
WARNING: This page is about a different car, the 2009 Ford Pickup, 2009 Ford F550 Super Duty, 2009 Ford F450 Super Duty, and 2009 Ford Cab & Chassis. 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 if you think of Hz as CPS. There are 60 seconds in a minute, therefore you would multiply your Hz reading by 60 to get RPM. Conversely, you would divide RPM 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.