Billgran wrote:
"Del Cecchi" wrote

Why is it that etec needs special rocket science NASA aluminum that is
really really extra strong and tolerates especially high temperatures in
its pistons? Don't they use normal cast or forged aluminum pistons?





Del,

Then if there were only 2 types of pistons, cast or forged, then why have 2?
Why make a motor that has to use a forged piston with different clearances,
even though they are stronger, instead of cast pistons which are cheaper to
produce? Just make 1 model, and only use one aluminum alloy for every
conceivable engine made or in design.

This link might give you some more information:

http://www.pacmaterials.com/technology/Technology.htm

Bill Grannis
service manager


I understand the reasons pro and con for forged vrs cast pistons for
automotive applications. It just struck me as a little ironic that
after all the "discussion" over lean burn and detonation and high
temperatures and all that, that this press thing touting the NASA alloy
use came out.

I had a little trouble figuring out how this alloy is different from
other silicon containing aluminum alloys that folks have been making
pistons out of for years. But that is a press release for you. I am
sure there are differences, but it can't be figured out from the press
release.

--
Del Cecchi
"This post is my own and doesn’t necessarily represent IBM’s positions,
strategies or opinions.”