Has anyone seen a piston like this?

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2/28/2019 8:25 PM

This is out of a diesel engine but I've never seen a gap between the rings and the skirt of a piston. Does this only work in low RPM motors?
Photo

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2/28/2019 8:51 PM

It's for high cylinder pressure (turbo or supercharged) engines. This separates the crown load/deformation from the skirt sideload / deformation, and also reduces piston mass.

I'm not a diesel guy, but I've seen pictures of these in highly boosted race engines .

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3/1/2019 1:46 PM
Edited Date/Time: 3/1/2019 1:48 PM

That is a steel piston. Those have been around for about 20 years. It's designed to be as light as a aluminum piston. And no they are not meant for only low RPM motors.

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3/2/2019 7:56 PM

Mahle refers to them as a Monotherm piston. Like stated above they are made of steel.

Guys have made over 2,000 hp with them in a Cummins application.

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