Motor dökümleri.

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Most cast aluminum engine blocks are made from one of three alloys: 319, A356 or A357. The 319 alloy is 85.8% to 91.5% aluminum, 5.5% to 6.5% silicon, 3% to 4% copper, 0.35% nickel, 0.25% titanium, 0.5% manganese, 1% iron, 1% zinc and 0.1% magnesium. The alloy is given a T5 heat treatment to harden and strengthen the metal before the block is machined to final dimensions.

For performance applications, the A356 and A357 alloys are most commonly used. These alloys have a higher percentage of aluminum (91.1% to 93.3%), more silicon (6.5% to 7.5%), a little more magnesium (0.25% to 0.45%) but less copper (0.2%), less iron (0.2%) and less zinc (0.1%). The alloy is relatively soft as cast, but ends up being much stronger after it receives a T6 heat treatment.

Billet aluminum engine blocks are made from a different 6061 “aerospace” alloy that is more ductile than A356 or A357, and is highly resistant to cracking under extreme pressure. The 6061 alloy in forged billet blocks is often pressure treated to decrease porosity and increase density. This gives 6061 billet a tensile strength of 60,000 to 70,000 psi, compared to 13,000 to 14,000 psi for A356 cast aluminum. That’s why the most demanding racing applications such as Top Fuel dragsters run 6061 billet aluminum blocks.

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3.5% carbon, 2.25% silicon, 0.65% manganese, and the balance (93.6%) iron.
11.5% silicon, 0.5% manganese, and 0.4% magnesium, with the balance (87.6%) aluminium.