|
If 12% is eutectic, then wouldn't 10% Si be hypoeutectic, not hypereutectic?
The KS "Alusil" barrels were meant to be the wear surface and were run with hard, iron coated pistons. The MAHLE "Nikasil" barrels were meant to be the hard surface with their thin Nickel-Silicon-Carbide coating on the Aluminum barrel and were run with a normal Aluminum piston and relatively soft rings.
The MAHLE alloy for pistons and cylinders is a higher Silicon content than the JE alloy, which is the one more stable at high temperature but a little softer and with more thermal expansion. I do not remember the numbers but there was a thread on here about materials for making new, CNC machined heads that discussed alloys. chris_seven was the main contributor.
__________________
1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
|