10-25-2023, 08:09 PM | #1 |
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Compression Test Numbers
I just recently purchased a 2016 BMW 650i Xdrive Gran Coupe with 67,000 miles and the car has ran great so far with no problems! However, I wanted to perform a compression test just to see what numbers I would get.
The Results: Cylinder 1: 160 Cylinder 2: 162 Cylinder 3: 160 Cylinder 4: 160 Cylinder 5: 180 Cylinder 6: 180 Cylinder 7: 180 Cylinder 8: 178 This is my first compression test so I'm learning as I'm going. Is the difference of psi between cylinders 1-4 and cylinders 5-8 concerning? Please if you have any thoughts or opinions I would greatly appreciate it! |
10-25-2023, 10:22 PM | #2 | |
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For your F06 650i x-drive, I found the following: “11 00 Compression pressure N63B40/44O1 Compression pressure (permissible deviation of cylinders from each other < 2.5 bar) || bar || 10 to 15 bar” Given that 1 bar = 14.5 psi, I’d say yours is looking pretty darn healthy there! I am interpreting this somewhat cryptic table to mean that acceptable compression is between 145 and 218 psi, with a permissible deviation between cylinders of 36 psi. Pretty wide tolerance, but then again my basis for comparison is narrow. |
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