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Extensive Technical Information: 2015 BMW M3/M4 and the S55 Engine

The S55 engine-equipped 2015 BMW M3 and M4 has been for sale for a while.

However, before looking at the below two technical documents from BMW, I bet you do not know the M3 and M4 in such depth. These two official documents provides precious details about these M cars and its heart: the S55 engine.


For example, some of the major differences between the S55 engine and the N55 engine (which is found in all BMW *35i models), are: 1. the S55 has closed deck crankcase, and the N55 is open deck; 2. the S55 has LDS-coated aluminum cylinder liners, while the N55 is using cast iron liners.


Download the documents for more insights.

M3/M4 Technical Document

S55 Engine Technical D...

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