Automotive Forum

... was our primary concern when measuring engine compression. With the WPS500x on the scene we are introduced to superior cylinder pressure analysis in the form of positive/negative ...

With the WPS 500 you can definitely check valve opening time in relation to crankshaft degrees. You can compare this to every other cylinder if you dont have a spec to go buy. This will tell you if any of the components that operate the valve are worn/defective

... cold, allow the engine to run for a while and retest. If you have a WPS 500 you can now carry out an Absolute Compression test by placing the WPS into cylinder 1 You ...

Just noticed this one was not completed, i never get a Notification from the Forum, don´t know why.Anyways.... The Problem with this Car "Glowing Cat" was solved with a new Engine ECU. Don´t know what went Bananas in that thing, but with a used one the car drives nice as before but no more extrem He...

Hi this thread is very interesting. I have a wps 500 and this explains so much. This is a fantastically powerful tool. Lots to learn though. So thanks ...

Normally compression pressures follow intake pressures. This capture was made before the WPS existed.

One of the really good things about this forum is you never stop learning and understand something new from an old idea. What I mean by this is; back at college we learned about volumetric efficiency (VE) and cylinder scavenging and when CATS were introduced to us back in the 1980's we were educated...

Wow, thank you for these Infos.I coukd not get my head around that.

I Will have to look into more infos on WPS Tests.
But makes total sense so far to me.

This is a real phenomenon and not a limitation of the pressure transducer Essentially everything takes time, Yup. The reason high RPM WPS tests have no real diagnostic value has to do with the physics of pressure wave propagation to the sensor. At some point the pressures in the cylinder ...

... of this engine. It simply cannot breathe fast enough as you have proven looking at the gauge in the exhaust system simultaneously with the WPS in the cylinder. Assuming the engine to be 100% Volumetric Efficient (VE) which it never will be, we should be seeing max airflow at approx. 55 ...