Why would you want a forged piston and not a cast one in your diesel engine? When might you be better off with a steel piston instead of aluminium, but at what risk? At PRI 2017 Eric from Mahle gave us the answers to these questions and much more in this great interview.
As well as materials, Eric talks about expansion and tolerances, how steel pistons can be almost as light as aluminium due to special design considerations, and why OEM pistons have a massive design flaw compared to aftermarket pistons due to their different goals.
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