False Detonation Signals And Valve Noise
Usage:
False detonation can be caused by anything else on the engine that causes vibration. However, it is typically caused by valve noise. Valve noise is generally constant from firing to firing. Its frequency is typically higher than actual detonation (10 to 12 kHz on G3600 engines).
An example of valve noise is pictured in Figure 6. Valve timing charts are included at the back of this document. They are useful in determining which valve is causing the false detonation. A formula to convert degrees to mS on the timing charts is:
mS = (167 / RPM) degrees.
Figure 6 Detonation Sensor output signal containing false detonation - top trace Combustion Buffer output signal - bottom trace
Caterpillar Information System:
SUPPLEMENT FOR G3600 ENGINES DETONATION AYALYSIS Detonation Sensor Signal Analysis
SUPPLEMENT FOR G3600 ENGINES DETONATION AYALYSIS Fluke Operation
SUPPLEMENT FOR G3600 ENGINES DETONATION AYALYSIS G3606 Time Delay Values
SUPPLEMENT FOR G3600 ENGINES DETONATION AYALYSIS G3608 Time Delay Values
SUPPLEMENT FOR G3600 ENGINES DETONATION AYALYSIS G3612 Time Delay Values
SUPPLEMENT FOR G3600 ENGINES DETONATION AYALYSIS G3616 Time Delay Values
SUPPLEMENT FOR G3600 ENGINES DETONATION AYALYSIS Time Delay Procedure For Fluke 90 Series.
SUPPLEMENT FOR G3600 ENGINES DETONATION AYALYSIS Time Delay Values For Cylinder Location
SUPPLEMENT FOR G3600 ENGINES DETONATION AYALYSIS Scope Probe Connections
SUPPLEMENT FOR G3600 ENGINES DETONATION AYALYSIS Setup Procedure For Fluke 90 Series
SUPPLEMENT FOR G3600 ENGINES DETONATION AYALYSIS Fluke ScopeMeter Settings
SUPPLEMENT FOR G3600 ENGINES DETONATION AYALYSIS General Oscilloscope Settings
SUPPLEMENT FOR G3600 ENGINES DETONATION AYALYSIS G3616 Odd Bank Cam Timing Events
SUPPLEMENT FOR G3600 ENGINES DETONATION AYALYSIS G3616 Even Bank Cam Timing Events
SUPPLEMENT FOR G3600 ENGINES DETONATION AYALYSIS G3612 Odd Bank Cam Timing Events
SUPPLEMENT FOR G3600 ENGINES DETONATION AYALYSIS G3612 Even Bank Cam Timing Events
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