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Discussion Starter #1
Does anyone know if the piston ar forged? I know that some of the part of the engine are forged(like the rod) but is there a way to know exactly all the dimension of the internal parts and if they are forged?
thanx a lot....
Sorry if my english suck...Im french from Quebec....
 

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I know I read that somewhere.....ah ha! If you punch up the "Insightman" webpage:

http://www.insightman.com/pk_art/pk_art-01.htm

About the 4th bullet point down he indicates, "shot-peened forged-aluminum pistons"

Based on that, I would say, yes they are forged, unless someone else knows different. As for the last part of your question, I would think any good shop manual (Helms?) would give you a nominal dimension and a wear limit. I don't know if it would specifically state if the parts were forged, cast, billet, etc.

Good Luck
 

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Also here:
http://www.insightcentral.net/encyclope ... ction.html

"Honda engineers specified a new lightweight aluminum-alloy piston design for the IMA engine. The pistons have a minimal skirt area and the surface of the skirt has been shot-peened. Shot-peening is a process in which a metal part, such as a piston or connecting rod, is blasted with shot-like particles, creating uniform, microscopic dimples on the surface. This dimpled surface is better able to retain a lubricating oil film. Shot-peening the IMA engine's pistons accounts for another 1.5- to 2.0-percent reduction in internal friction."
 
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