Soup Nazi
The artist formerly known as Don M
- Joined
- Sep 26, 2006
- Messages
- 1,197
The damage is caused from power density and heat release VS time. Nothing more.
Water will slow down the release rate and add capital to your bank account of aluminum hardness VS the time/heat applied to them. Those poor pistons start out with a brinell around 95-100 and some end up in the 60 range after multiple hard runs. Ever see how low the tensile strength and durability drops at 60 brinell? Copper is roughly 40 brinell for a bit of comparison.
The melting wont always begin right away. As the hardness drops from the constant annealing of high cylinder temps the pistons get very easy to crack, break, and/or melt. Thats why the Mahle monotherms are constructed of steel, not aluminum.
The bowl type has nothing to do with the failures. The 03-04 engines are lower power density and have a lower heat release rate. Heat release rate = power levels.
Water will slow down the release rate and add capital to your bank account of aluminum hardness VS the time/heat applied to them. Those poor pistons start out with a brinell around 95-100 and some end up in the 60 range after multiple hard runs. Ever see how low the tensile strength and durability drops at 60 brinell? Copper is roughly 40 brinell for a bit of comparison.
The melting wont always begin right away. As the hardness drops from the constant annealing of high cylinder temps the pistons get very easy to crack, break, and/or melt. Thats why the Mahle monotherms are constructed of steel, not aluminum.
The bowl type has nothing to do with the failures. The 03-04 engines are lower power density and have a lower heat release rate. Heat release rate = power levels.