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Old 03-01-2023, 11:19 AM   #11 (permalink)
Isaac Zachary
High Altitude Hybrid
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Avalon - '13 Toyota Avalon HV
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Originally Posted by Solarpowered View Post
I'm not sure if there are any lighter pistons that would increase efficiency. One would think that forged pistons pack more material into a smaller package. Thus increasing the density, and increasing the weight.
It's not just the weight. It's mainly the clearances. Forged pistons are stronger (good for racing applications) but expand more. Therefore you need greater clearances, therefore the pistons rock and slap more, therefore you get more friction and wear.

Here's an example:

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