PicoScope 7 Automotive
Available for Windows, Mac, and Linux, the next evolution of our diagnostic scope software is now available.
2013 Audi A4 CGLC
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metalworksauto
- Newbie
- Posts: 1
- Joined: Tue Apr 12, 2022 10:36 am
2013 Audi A4 CGLC
found something in a waveform we have never seen before can anyone help, its the double peaks.
OneDrive link for the files for each cylinder, a Pico transducer on range 1.
https://1drv.ms/u/s!AvklUFhLrzpUmAFTeAJ ... =WLhTGK>
OneDrive link for the files for each cylinder, a Pico transducer on range 1.
https://1drv.ms/u/s!AvklUFhLrzpUmAFTeAJ ... =WLhTGK>
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Steve Smith
- Pico Staff Member
- Posts: 1594
- Joined: Sun Aug 25, 2013 7:22 am
Re: 2013 Audi A4 CGLC
Hello and thank you for the post
Below we have the double peak you describe which is typical of a diesel engine where combustion is taking place
Given we access the cylinder via the glow plug drilling, if the injector remains connected or, if the injector momentarily operates, we have a sealed cylinder and therefore combustion. Spraying accelerant into the intake will also generate this double peak
The double peak indicates a dramatic increase in pressure which is expected during combustion
I notice your intake and expansion pockets are "well defined", could you confirm the pressure transducer was switched on with no pressure present at the measurement port? (i.e. open to atmosphere)
This is important for 0 bar calibration
I can see this was a running compression test, could you confirm the compression hose did not over heat during these measurements as this can weaken the hose and present erroneous readings?
Moving onto compression testing diesels with the WPS500x, could you take a look here regarding "compensation" topic16131.html
I hope this helps, take care.....Steve
Below we have the double peak you describe which is typical of a diesel engine where combustion is taking place
- Image 1
The double peak indicates a dramatic increase in pressure which is expected during combustion
I notice your intake and expansion pockets are "well defined", could you confirm the pressure transducer was switched on with no pressure present at the measurement port? (i.e. open to atmosphere)
This is important for 0 bar calibration
I can see this was a running compression test, could you confirm the compression hose did not over heat during these measurements as this can weaken the hose and present erroneous readings?
Moving onto compression testing diesels with the WPS500x, could you take a look here regarding "compensation" topic16131.html
I hope this helps, take care.....Steve