M103 Compression Ratio

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oldskoolmercs

Active Member
Joined
Apr 7, 2010
Messages
73
Car
C250TD
Hi,

I needed to know the compression ratio figures for the 3.0 M103 engine... where they all 9.2:1.?

I have heard that some were 10.1 is this correct?
And is there any way of knowing when looking at the car or engine.

Regards,
Oldskoolmercs...
 
Some were 10.1 but they are very rare, found in the w124 4matic and possibly the w126 300se.
If I remember correctly, the compression ratio is stamped on the inlet side of the block in white paint.
 
3.0L M103 in the 124 were all 9.2:1CR which makes them the perfect candidate for boost :bannana:
 
Thanks :thumb:

Some were 10.1 but they are very rare, found in the w124 4matic and possibly the w126 300se.
If I remember correctly, the compression ratio is stamped on the inlet side of the block in white paint.

3.0L M103 in the 124 were all 9.2:1CR which makes them the perfect candidate for boost :bannana:
 

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