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Testing Ignition Timing

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Testing Ignition Timing Testing Ignition Timing Using Pico Scope & WPS500X Pressure Transducer and kV Pickup Use PgUp and PgDn keys or Mouse Scroll Wheel to navigate tutorial Setting up the Pico Scope Plug USB for Pico into Computer and Start Pico Software Use the Red ‘Stop’ Button (or the Space Bar) to pause the Scope before adjusting the settings Select the ‘Collection Time’ Box to adjust the time setting Use the drop down menu to select 10 s (This is a good time setting for most captures – adjust if needed) Select ‘CH A’ to set up this channel to measure pressure (Pressure Transducer connected to ‘CH A’) Select the ‘Probes’ drop down menu by clicking on the arrow next to ‘Probe’ (Do not select the pop up menu – Button with ‘3 dots’) In the ‘Probes’ drop down menu scroll down to ‘Library’ (Do not choose from the ‘Standard’ nor the ‘Automotive’ Menus) Under the ‘Library’ Menu Select ‘WPS500X 500 psi (Range 1)’ Make sure the filter is turned on the pressure transducer (1 kHz filter) Use the probe library to set CH D to ‘Secondary kV (Inverted) +/- 50 kV (If secondary pattern is upside dwon switch to ‘Secondary kV (Pos) +/- 50 kV) Set CH D to the +/-50 kV Scale Turn off the channels that you are not using (CH B and CH C) To adjust the zero position – select the scale and move down as needed Setting Up the WPS500X Pressure Transducer & Secondary kV Pickup WPS500X Pressure Transducer Turn Power on Press power button to turn on (Press & Hold Briefly to Turn Off) WPS500X Pressure Transducer Lights will flash as the unit Self calibrates Don’t Touch! Unit will run a self calibration WPS500X Pressure Transducer Range 1 should be lit When calibration is complete Make sure ‘Range 1’ (500 psi) is selected and that none of the ‘Zoom’ lights are lit Danger: Never connect scope directly to secondary with back pins or alligator clips. Only use Secondary kV pickup on the secondary side Secondary Capacitive Pickup Clip to Spark Plug wire Always ground to an Engine Ground (Not Chassis or Battery) Remove Spark Plug from cylinder to be tested Connect Spark tester to plug wire (if adjustable set a ‘S|E’ Gap) Clip Secondary kV Probe to plug wire (Ground to Engine Ground) Thread compression hose into cylinder Connect Pressure transducer to compression hose Connect Pressure transducer to scope ( CH A – Blue ) Use the Green Start Button to start the scope. Crank (or Run) Engine for at least 5 seconds and use the Red Stop Button to pause Select the ‘Windowed Zoom’ Tool to take a closer look Zoom in on one complete cycle of the engine (2 revolutions of the crankshaft – compression to compression) (Note: COP and DI will not have the Waste Spark Eve Spark Waste the have not willDI and COP (Note: DIS a –Cranking waveform for Typical w System Waste Spark TDC Comp Waste Spark Waste nt on the Exhaust Stroke) Exhaust the on nt ith goodtiming ignition ith Spark TDC Comp Degree Cursors Use Degree Cursors to mark off 2 revolutions of the crankshaft (720 o) 0o Top Dead Center Compression Degree Cursors 2 Revolutions of Crankshaft (720 o) Use Degree Cursors to mark off 2 revolutions of the crankshaft (720 o) Measurement Cursors Use measurement Cursor to measure when spark occurs (Note: Spark typically occurs 0 o to 30 o Before Top Dead Center Compression 0o to 10 o cranking) Measurement Cursor Use measurement Cursor to measure when spark occurs (Note: Spark typically occurs 0 o to 30 o Before Top Dead Center Compression 0o to 10 o cranking) Rulers Menu Use Rulers Menu to mark off 4 divisions (Rotation Partitions) TDC BDC TDC BDC TDC Comp. Exhaust Comp. Power Intake Typical Cranking waveform for a DIS – Waste System with good ignition timing With 4 strokes marked off 1 3 2 4 1 Use the engine firing order and rulers to mark off when each cylinder is at top dead center compression (Example above: 4 Cylinder with firing order 1-3-2-4) 2 1 8 4 3 6 5 7 2 #2 Cylinder 8 Rulers Menu Use the engine firing order and rulers to mark off when each cylinder is at top dead center compression (Example above: 8 Cylinder with firing order 1,8,4,3,6,5,7,2).
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