Normal Engine Vibrations - The NVH App

This video demonstrates how to use the new NVH app to measure and diagnose normal engine vibrations on vehicles with 4, 6, and 8 cylinders.

This app is designed for smartphones and properly equipped tablets with GPS.
Apple App Store: "NVH" app https://apps.apple.com/us/app/nvh/id1...
Google Play Store: "NVH for Android" app https://play.google.com/store/apps/de...

TIMELINE:
0:00 Start
0:09 Introduction
1:50 Bluetooth Adapter (We now use the Kiwi3 for cars and light trucks and the Nexiq Blue Link for class 4-8 trucks)
3:22 Setup the app for a vehicle with a six-cylinder engine
4:35 Start the record feature of the app
5:10 Setting the phone on the vehicle so the app can use the phone's sensors to detect vibrations.
5:47 No engine vibrations detected on the radiator support (this is normal)
5:51 Engine vibrations detected on the engine cover (this is normal)
6:32 The vehicle view screen
6:40 The live graph screen and a normal E3 (Third-order engine) vibration
7:32 The job of the motor mounts, transmission mount, exhaust mounts.
8:30 The live data screen
10:32 MUST SEE: Comparing the NVH app accuracy to a resonant reed tachometer
13:35 Using the app on a vehicle with a four-cylinder engine
13:54 The vehicle view screen
14:28 The live graph screen and a normal E2 (Second-order engine) vibration
14:40 Checking the motor mounts and transmission mounts
15:20 The live data screen
16:12 Some normal engine vibrations are being transferred to the radiator support (Not typically normal)
17:54 How to use the app without a Bluetooth adapter with manual engine RPM input
20:12 Using the app on a vehicle with an eight-cylinder engine
20:30 The vehicle view screen
21:10 The live graph screen and a normal E4 (Fourth-order engine) vibration
21:40 The live data screen
21:51 Checking the motor mounts and transmission mounts
22:26 Manual engine RPM input without Bluetooth
23:28 Diagnostic help file in the app will tell you which engine vibrations are normal or abnormal
23:45 Video Summary

ABOUT US:
Weber State University (WSU) - Department of Automotive Technology - Transmission Lab. Visit the following website for information on how to attend our school and obtain an associate's degree or bachelor's degree in Automotive Technology. http://www.weber.edu/automotive

This video was created and edited by Professor John D. Kelly at WSU. For a full biography, see http://www.weber.edu/automotive/J_Kel...

Questions for teachers:
1. What vehicle information is needed by the NVH app?
2. Is a Bluetooth data link connector (DLC) adapter needed for the app to function?
3. Why does the phone need to touch the vehicle for the NVH app to work?
4. What type of vibration was detected on the Ford 6 cylinder engine?
5. Why was the engine vibration was not detected with the phone on the radiator support?
6. Is the engine speed-related vibration detected on this engine a normal or abnormal vibration?
7. What type of vibration was detected on the Dodge 4 cylinder engine?
8. Why was the engine vibration was not detected with the phone on the radiator support?
9. Is the engine speed-related vibration detected on this engine a normal or abnormal vibration?
10. What type of vibration was detected on the GMC 8 cylinder engine?
11. Why was the engine vibration was not detected with the phone on the radiator support?
12. Is the engine speed-related vibration detected on this engine a normal or abnormal vibration?
13. If a Bluetooth data link connector (DLC) adapter is not used, how does the app know what the engine RPM is?
14. Tell me one thing you learned from this video

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