IMS Replacement... The Jager Saga

[Jager]

Put 8 1/2 quarts of Mobil One, it's the only oil I use. Also trying-out Royal Purple in the gear box.

Does anyone else have this decal on the under-side of their trunk??

[Jager]

It's like driving a new car again! The clutch grabs quickly, the gearbox is shifting very smoothly, and no more vibration at 3000 RPM. I'm sure the old flywheel was causing the vibration problem.

[Jager]

I'm reviewing some of the data I recorded. Can anyone explain why the "camshaft position deviation" is different now (both banks are closer) than before I started this project? The idle is also smoother and a little higher. O2 sensors changed the idle???

[JFP in PA]

Originally Posted by Jager

I'm reviewing some of the data I recorded. Can anyone explain why the "camshaft position deviation" is different now (both banks are closer) than before I started this project? The idle is also smoother and a little higher. O2 sensors changed the idle???

Answer is simple: With the new IMS installed, there is now less "slop" in the cam drive system. The normal cam deviation values are an expression of how far off ideal the shafts are running at idle, and the deviation is caused by wear and mechanical +/- variances, etc. It is also not uncommon for an IMS bearing that is near death to cause the cam deviation values to swing wildly back and forth while the engine is at idle.

[Jager]

Originally Posted by JFP in PA

Answer is simple: With the new IMS installed, there is now less "slop" in the cam drive system. The normal cam deviation values are an expression of how far off ideal the shafts are running at idle, and the deviation is caused by wear and mechanical +/- variances, etc. It is also not uncommon for an IMS bearing that is near death to cause the cam deviation values to swing wildly back and forth while the engine is at idle.

Here are more interesting snapshots of before and after the project that show some improvement. The "Actual Angle For Camshaft" data I recorded before the project, on 9 April, and the data I recorded yesterday. The scales on the graphs are different (software auto selected) but on 9 April there was .50 degrees variance on bank 1, and after the IMS bearing upgrade there is now .30 degrees variance on bank 1. See attached files.

Jager

[tonycarreon]

wow. very interesting. i had to go check mine to see what was up.

at idle, no change in deviation - stays at:
1: -8.88
2: -5.64

actual angle:
1: -0.33
2: -0.28

during drive @ 3k RPM (i didn't check actual angle) the deviation moved to:
1: -8.98
2: -5.69

i love this forum - i learn something new every day! and jager, thanks for this awesome thread.

[Jager]

Originally Posted by tonycarreon

wow. very interesting. i had to go check mine to see what was up.

at idle, no change in deviation - stays at:
1: -8.88
2: -5.64

actual angle:
1: -0.33
2: -0.28

during drive @ 3k RPM (i didn't check actual angle) the deviation moved to:
1: -8.98
2: -5.69

i love this forum - i learn something new every day! and jager, thanks for this awesome thread.

More than 3 degrees difference between banks on deviation... Not sure what the specifications are for timing difference between banks are but you might want to take a close look at this. I'm sure performance is not optimal.

Jager