Visible difference between factory cast pistons and forged aluminum? - 3000GT/Stealth International Message Center
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Old 01-17-2003, 05:08 PM   #1 (permalink)
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Default Visible difference between factory cast pistons and forged aluminum?

Does anyone know if there is a way to tell the difference between forged aluminum and cast pistons, by looking at them? I can't see the crown, I'm staring at them through the underside of the block.
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Old 01-17-2003, 08:11 PM   #2 (permalink)
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I could be wrong, but I think if the underside of the piston, kind of inside the piston above the rod, the surface should be rough from the casting mold.
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Old 01-18-2003, 05:18 AM   #3 (permalink)
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Joe,
Look on my piston upgrade web page. It shows my Venolia forged pistons. Others look similar. The stock cast pistons look VERY different. One obvious difference is the steel support attached to the inside of the skirt of the cast pistons. It is used for strength and to limit expansion. The forged pistons are shaped diferrent in the inside and are smooth on the inside - no casting marks.
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Old 01-18-2003, 01:44 PM   #4 (permalink)
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Thanks Jeff! (And Ikestaa )
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