what year 302's had forged pistons? - Ford Mustang Forum
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post #1 of 21 (permalink) Old 11-03-2003 Thread Starter
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what year 302's had forged pistons?

Hey all,
Just wondering if anybody knew up to what year mustang did the 302 still carry forged pistons?
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post #2 of 21 (permalink) Old 11-03-2003
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I think it was up to 93.
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post #3 of 21 (permalink) Old 11-04-2003
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no, up to 92
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post #4 of 21 (permalink) Old 11-04-2003
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Quote:
Originally posted by Twister
no, up to 92

Rats..close but no cigar, sorry. Thanks for clearing that up Twister!!
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post #5 of 21 (permalink) Old 11-04-2003
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'85 (4V only) and '86 through late '92 models.

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post #6 of 21 (permalink) Old 11-04-2003
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what are forged pistons? what is the differance between those models and the 93-95 models?
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post #7 of 21 (permalink) Old 11-04-2003
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There are two types of OEM pistons: cast aluminum and forged aluminum. The "cast" or "forged" just refers to how the piston is formed, i.e. one is cast into a mold and one is forged (forced) into a mold.

Cast means molten aluminum is poured into a mold.

Forged means a chunk of aluminum is forced into shape by a (massive) press.

Late '92 (model year) and up pistons are cast hypereutectic aluminum.

http://www.enginepartsone.com/Faq/pistons.html

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Originally posted by GreyLX306 at The Corral:
The term "hypereutectic" means that the mixture of silicon in the aluminum exceeds the eutectic point. The eutectic point is the exact mixture (12.6% silicon in aluminum) where solidification of occurs completely at the eutectic temperature (around 550 degrees celcius in Al Si), and in turn forms a lamellar structure with optimum dispersion strengthening. With more than 12.6% silicon, the silicon begins to solidify as the alloy cools, but before the eutectic temperature is reached, thus leaving patches of pure silicon despersed throughout the alloy.

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post #8 of 21 (permalink) Old 11-04-2003
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I have the hyp. con. pistons in the 93 GT.
I really wish that they were forged though

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post #9 of 21 (permalink) Old 11-05-2003
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hyper pistons are better for a NA car, less slop and dont burn oil....but they dont like more than 5 pounds of boost
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can u tell by lookin at the pistons if they r forged?
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Why are forged pistons beter?
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Quote:
Originally Posted by 1996gtpower View Post
Why are forged pistons beter?
They take heat and detonation better and are generally stronger than cast.

It's argued that forged pistons are ALWAYS better, and that's not always the case. Depends on the application.

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good to know the differences
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Glad someone broght up a 8 year old thread.

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Quote:
Originally Posted by Smurf stang View Post
Glad someone broght up a 8 year old thread.
Well, that is just how important it is!

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