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      09-26-2013, 03:38 PM   #56
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Originally Posted by PackerFan View Post
Amazing how thin the cylinder walls are, between cylinders. I'm sure some magical engineering was done to prevent issues with heat and blown head gaskets. Looks like a grove was added to help keep the gasket in place.
The "groove" is only visible on the N55 engine and not the S55.

And in that direction (between cylinders) it's mostly combustion pressures that affect the cylinder walls. Towards the outside the cylinder walls are thicker as that part has to deal with the forces applied on the piston via the crank rod during the rotation of the crankshaft. Those forces act against the cylinder wall since the crank rod during large parts of the rotation is at an angle against the cylinder wall.