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A forged thing is heavier then a cast thing.
when made identically, yes.
but often times, Forged pistons are lighter than their cast counter-parts, because the stronger forging allows for less material at the same or greater overall strength.
Especially when you start comparing aftermarket forged pistons to heavy stock cast ones.
NO the density of steel is the same, whether it's cast or forged, 7820 kg/cubic meter. if 2 cranks are dimensionally identical (both displace the same volume), their mass will be the same even if one is CAST STEEL and the other is forged steel.
IF a crank is dimensionally identical, but the cast one is lighter, then it is not CAST STEEL. then it is most likely DUCTILE CAST IRON, also known as NODULAR IRON. it's density is about 10% less than steel, due to the much higher carbon content (which, in ductile iron is in the form of little spherical nodules dispersed though the continuous iron phase)...IIRC it's manganese as an alloying element that causes the carbon to form nodules vs. flakes like in traditional (grey) cast iron, but it's been 16 years since I had any metallurgy classes.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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