What is this little box i found...

[JFP in PA]

[jaykay]

I had originally envisioned a cam shaft deviation, fluctuation monitor and threshold to specifically target the IMS bearing. Dancing deviations beyond a certain threshold giving an appropriate alarm. I am not sure whether this (ims bearing instability) could be sensed at a reasonably advanced time (before chips get on a detector).

Mr. Raby shot down this idea at the time......my memory fails me at to why

[JFP in PA]

Originally Posted by jaykay

I had originally envisioned a cam shaft deviation, fluctuation monitor and threshold to specifically target the IMS bearing. Dancing deviations beyond a certain threshold giving an appropriate alarm. I am not sure whether this (ims bearing instability) could be sensed at a reasonably advanced time (before chips get on a detector).

Mr. Raby shot down this idea at the time......my memory fails me at to why

Take a ride in your car once fully warmed up with the Durametric system monitoring cam deviation values any you will have the answer to your question. With the valve timing system active, the deviation values jump all over the place, depending upon what the car is doing at the time; so a system that alarms when a certain deviation value is hit would be doing one of two things: Alarming every 15 seconds if it is set too low, never going off if it is set too high. It would also be comparatively expensive, as it would require something with computational capabilities to even work.

[jaykay]

Originally Posted by JFP in PA

Take a ride in your car once fully warmed up with the Durametric system monitoring cam deviation values any you will have the answer to your question. With the valve timing system active, the deviation values jump all over the place, depending upon what the car is doing at the time; so a system that alarms when a certain deviation value is hit would be doing one of two things: Alarming every 15 seconds if it is set too low, never going off if it is set too high. It would also be comparatively expensive, as it would require something with computational capabilities to even work.

True, I don't doubt this at all. I think I have done this. I think I posted something here regarding engine temp and deviation readings here many years ago. I was specifically referring to fluctuation rate not deviation itself. So in other words we could see deviation changes all over the place for various engine states and temperatures but if there is an undue fluctuation or let say vibration at a certain deviation then its time to shut her down.

So we have moved from +2 to +5 degrees according to what has been observed M96 behaviour> no alarm

A fine lets say "high frequency" fluctuation at +5 constant engine state> alarm.

Whether this feasible is another question.