Compression Ignition Addict
Join Date: Apr 2007
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Ford states to never run below 40% and never run over 60%. The reasons are several fold:
1. Corrosion protection (and not just a little, but a lot - especially aluminum).
2. Pump cavitation protection
3. Pump lubrication
4. Deposit (percipitation) control
5. Proper heat transfer
6. Proper boiling point elevation and freezing point suppression
Keep in mind that higher heat transfer may not be the best thing. Skin temperatures of metal cause the coolant temperatures to experience localized areas of higher than average temperatures. This can cause boiling at the metal surfaces and this increases corrosion and solids deposition.
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