WS1 petrol fuel injector testing
used a screw driver and the injector was OK. The battery voltage was 12v
Results:
Cyl1 12.2v
Cyl2 12.4v
Cyl3 12.3v
When using a LED tester all flashes were acceptable on idle. When revved flashes got so fast it seemed like the LED tester was perminately on but it wasn't. Testing injectors with a LEd tester is a good test but it isnt accurate enough. All it tell us is its opening and closing thats all, not for how long which is what we're looking for.
When using the multimeter set to duty cycle all 3 cylinders were 2%. The means they were open for 2%. This means they were open for 2% when idling. When accelerated short fast throttle opening it increased to 13.9% meaning 13.9% of one cycle it was open for 13.9%
When using the multi meter to read Hz (hertz) on idle it recorded 0.045k Hz. When increased engine RPM it recorded 1.12k Hz
Calculation: Pulse width ms = (% duty cycle/100) / Frequency
(2/100 / .05 = .02 / 0.05 = .4ms
(1.9/100 / 0.0045 = .019 / .0045 = .42ms
When revved = (13.9 / 100) /.05= 2.78ms. (all 3 cylinders were the same)
CONCLUSION:
I think this is a good way to test injectors without pulling them right out. Doing all these tests you get a good estimation how well your injectors are working. If you get reading out of spec you can guess there maybe a bad connection somewhere. But pulling them out is also a good idea so you can put them on the pattern tester and see how well its spraying because you need good atomised spray not dribbles or uneven spraying. Atomised spray will give you a better combustion (bang) in the chamber than uneven spray or dribbles.
Results:
Cyl1 12.2v
Cyl2 12.4v
Cyl3 12.3v
When using a LED tester all flashes were acceptable on idle. When revved flashes got so fast it seemed like the LED tester was perminately on but it wasn't. Testing injectors with a LEd tester is a good test but it isnt accurate enough. All it tell us is its opening and closing thats all, not for how long which is what we're looking for.
When using the multimeter set to duty cycle all 3 cylinders were 2%. The means they were open for 2%. This means they were open for 2% when idling. When accelerated short fast throttle opening it increased to 13.9% meaning 13.9% of one cycle it was open for 13.9%
When using the multi meter to read Hz (hertz) on idle it recorded 0.045k Hz. When increased engine RPM it recorded 1.12k Hz
Calculation: Pulse width ms = (% duty cycle/100) / Frequency
(2/100 / .05 = .02 / 0.05 = .4ms
(1.9/100 / 0.0045 = .019 / .0045 = .42ms
When revved = (13.9 / 100) /.05= 2.78ms. (all 3 cylinders were the same)
CONCLUSION:
I think this is a good way to test injectors without pulling them right out. Doing all these tests you get a good estimation how well your injectors are working. If you get reading out of spec you can guess there maybe a bad connection somewhere. But pulling them out is also a good idea so you can put them on the pattern tester and see how well its spraying because you need good atomised spray not dribbles or uneven spraying. Atomised spray will give you a better combustion (bang) in the chamber than uneven spray or dribbles.
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