M103 Compression Ratio

oldskoolmercs

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Joined
Apr 7, 2010
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73
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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...
 

carat 3.6

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Buckinghamshire, yuppie central 1985.
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96 e300d, 88 w124 superturbodiesel, 90 bmw E30 v8, + "others"
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.
 

RBYCC

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1971 280SL, 1988 300CE TT, 1994 E320 CAB, 1999 AMG C43, 2005 AMG G55K 2008 CLK63 AMG BLACK SERIES
3.0L M103 in the 124 were all 9.2:1CR which makes them the perfect candidate for boost :bannana:
 
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oldskoolmercs

oldskoolmercs

Active Member
Joined
Apr 7, 2010
Messages
73
Car
C250TD
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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