Hi MbhdA.Hank . . .

Not sure I follow where these 'HP reducing frictional losses' might be. In a press fit set up the wrist pin is held fast in the small end of the rod with bearing surfaces only in the piston shoulders. When switching over to a free-float an additional bearing surface is created in the small end of the rod - either by machining the rod end to tolerance or pressing in an appropriate OD bushing that has an ID to tolerance allowing the wrist pin to float.

So where's the frictional loss-gain?

As for Mopar's reasoning behind floating wrist pins in the new SRT - I'd read that is was done to allow for "Higher Loading"

regards,
stock49

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