[W126 Coupe] question for regarding exhaust

[Dan Landiss]

on 1/29/2008 8:43 PM Markus Meyer wrote:

> I've heard that our cars had engines "blueprinted" at the factory? 


The version I heard was that after the pistons were manufactured they 
were sorted into lots to the nearest 0.0002" (2/10,000). After the 
cylinders were honed they were similarly measured and a piston from the 
best-matching bin went into each hole.

I can tell you that when we replaced the pistons in my 1973 450SL with 
higher-compression parts at 103,000 miles, the oil grooves 
(circumferential machined grooves) were still quite apparent. See the 
attached scan.

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