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-   -   4.6is compression numbers (https://xoutpost.com/bmw-sav-forums/x5-e53-forum/112832-4-6is-compression-numbers.html)

x5Alpine 01-13-2021 03:57 PM

4.6is compression numbers
 
What are the values to determine "good" compression on the M62 4.6? The previous owner did a compression test and the values were around 150.

StephenVA 01-13-2021 04:37 PM

you are looking for numbers around 150 with cyl to cyl +- a few PSI. It is the ones way off that is the worry. not so much as "how high are they"

x5Alpine 01-13-2021 04:58 PM

okay cool. I drove the car back from BC to Reno not knowing the oil pickup was full of old timing guide debris and I pray that no damage was done to the motor. It runs great and has 152-155 compression on all cylinders still. I just get paranoid.

StephenVA 01-13-2021 05:27 PM

Unless you were at 6,000 RPM the whole way you should be good.

aureliusmax 01-14-2021 05:20 AM

I believe I had 200-210 on all

upallnight 01-14-2021 01:30 PM

Quote:

Originally Posted by aureliusmax (Post 1197897)
I believe I had 200-210 on all

What unit of measure is the gauge?

Just like the speedometer on cars can be KPH or MPH, the reading will be diifferent.

CapeX5 01-14-2021 06:07 PM

Also, old school compression test was with carburetor throttle plates had to be wide open. Does one open the throttle body on the modern cars to do a test??

upallnight 01-14-2021 07:19 PM

Quote:

Originally Posted by CapeX5 (Post 1197937)
Also, old school compression test was with carburetor throttle plates had to be wide open. Does one open the throttle body on the modern cars to do a test??

Throttle body on newer cars is electronically controlled.

Maruzo 01-15-2021 06:03 AM

Quote:

Originally Posted by x5Alpine (Post 1197856)
okay cool. I drove the car back from BC to Reno not knowing the oil pickup was full of old timing guide debris and I pray that no damage was done to the motor. It runs great and has 152-155 compression on all cylinders still. I just get paranoid.

https://xoutpost.com/bmw-sav-forums/...thread-26.html

Bimmerbreaker talked about having some oil starvation issues on his M62 that may have caused the rod bearings to fail.

He mentioned "..sustained high-RPM driving uphill to Flagstaff " and bits of guide pcs as possible causes.


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