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      05-06-2018, 07:00 AM   #1
Stock4Evr
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Compression Ratio

Doing some education into Compression Ratio (CR) and Octane (O). Where could I find the CR for my cars? I look into the manual but could not find the CR only the O to be used.

Last edited by Stock4Evr; 05-06-2018 at 07:33 AM..
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      05-06-2018, 10:01 AM   #2
1and1
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'09 135i  [10.00]
CR is 10.2:1

If there's an actual N54B30 service manual pdf out there I'd love a copy. Till then these links will get you some basic info-

https://en.wikipedia.org/wiki/BMW_N54
http://www.e90post.com/forums/showthread.php?t=38856
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      05-06-2018, 10:09 AM   #3
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1 and 1 - Thank you for the information.
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