Aluminium Pistons
Casting alloys:-
- LM13 (0.7-1.5Cu, 0.8-1.5Mg, 10-12Si, 1.5Ni, 1 Fe, expansion coefficient 19x10-6K-1)
- LM28 (1.3-1.8Cu, 0.8-1.5Mg, 17-20Si, 0.8-1.5Ni, 0.7Fe, expansion coefficient 17.5x10-6K-1)
- LM29 (0.8-1.3Cu, 0.8-1.3Mg, 22-25Si, 0.8-1.3Ni, 0.7Fe, expansion coefficient, 16.5x10-6K-1)
Wrought alloys for high duty engines:-
- e.g. Al-2.25Cu, 1.4Mg, 0.9Fe, 1Ni (used in F1)