For almost 100 years, United Engine and Machine has manufactured everything from basic stock-replacement pistons to top-of-the-line forged racing pistons, and everything in between — including diesel pistons. UEM makes a piston to fit almost any application of the past century and tries to keep as much work in-house as possible, even building their own machinery to create their custom pistons.
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It is commonly believed that hub dynamometers make more power than a roller dyno, but less than an engine dyno. Is this right, though?