PicoScope 7 Automotive
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Trying to make sense of a compression test done on a 355
Trying to make sense of a compression test done on a 355
All numbers are in MPa. The Maseraterati PicoDiagnostics gave the following results as "Passed"
Cyl. MPa PSI
#1 1.298 188
#2 1.000 145
#3 1.038 151
#4 1.273 185
#5 1.115 162
#6 1.300 189
#7 1.302 189
#8 1.302 189
A couple notes. The test was done with the PicoDiagnostics so I was told to convert 1.0 to 145PSI. so 1.25 would be 181.3. The MPa (MegaPascal) was "estimated" by me by the graph and so it could be a little off in the thousanths or possible by 1 in the hundredths but unlikley. For sure, #1 was above 1.25 and #2 was at 1.00. #3 was a smidge higher than #2 and #5 was right between the 1.00 and the 1.25 hash marks.
I have been told that on a 355, all cylinders should be over 170 AND not farther than 10% from each other. The last major was a bit over a year ago.
What is reality?
Cyl. MPa PSI
#1 1.298 188
#2 1.000 145
#3 1.038 151
#4 1.273 185
#5 1.115 162
#6 1.300 189
#7 1.302 189
#8 1.302 189
A couple notes. The test was done with the PicoDiagnostics so I was told to convert 1.0 to 145PSI. so 1.25 would be 181.3. The MPa (MegaPascal) was "estimated" by me by the graph and so it could be a little off in the thousanths or possible by 1 in the hundredths but unlikley. For sure, #1 was above 1.25 and #2 was at 1.00. #3 was a smidge higher than #2 and #5 was right between the 1.00 and the 1.25 hash marks.
I have been told that on a 355, all cylinders should be over 170 AND not farther than 10% from each other. The last major was a bit over a year ago.
What is reality?
Re: Trying to make sense of a compression test done on a 355
I am guessing you have a Ferrari 355 there. First it would be get some background, what is the fault symptom and any fault codes or data of interest.What is reality?
Can you do another compression test using the "Automotive Software" not "Pico Diagnostics" using an amp clamp on Channel A & Ignition Primary or Secondary on "B" if you have a 3rd Channel then add battery voltage.
If you only have 2 channels then you will have to do it twice, keeping the amp clamp on for both captures.
Please get it so at least 4 or 5 revolutions can be seen across one screen.
thanks