Durametric Cam Shaft Deviation Change

[Jake Raby]

Originally Posted by jaykay

I ran some Durametric work sessions for cam shaft deviation and saw a change in deviation as the car warmed. Ahhhh have not seen this before and am properly freaked out! There were not fluctuating/dancing but they drifted. Pos.1 dev. drifted the most.

The files are attached; scroll through and have a look. The time stamp in the file names are indicative of first to last sessions and cold to warm.

I could see pos. 1 vary from -1.59 all the way to -2.05 degrees
and pos. 2 vary from -3.69 to -3.8 degrees. Session 3 file: 2014_09_29_22_03_20 shows a lot of change starting at line 489!

The readings eventually stabilized in the later sessions close to 86 C at: pos. 1>-2.05pos. 2>-3.8

Is this: a real cam drive issue; a sensor issue; a normal senor warm up problem; Durametric sampling problem???

Edit: apologies the files are not permited; I will have to email them or cut and paste some of the data

Do you have anything tied in with the oiling system at all?

[jaykay]

Originally Posted by Jake Raby

Do you have anything tied in with the oiling system at all?

The car is a 5 chain, 2000 S running 5W40.

It does have a deep sump but other than that there are no oil system modifications.