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Originally posted by nick Godridge What are your experiences with this? Quote A recent technical enquiry to Evans resulted in the following replies: Q1. What is the coefficient of thermal expansion over range -20degC to +120degC, A1. The co-efficient of expansion of water based 50/50 standard automotive antifreeze is approximately 5% by volume, Evans Waterless Engine Coolant is approximately 6% by volume. Q2. Is this expansion consistent across that temperature range?; A2. Yes, this expansion rate is consistent across these temperature ranges and again similar to that of 50/50. The 6% by volume figure is based on the high end of the temperatures that you have stated above. Q3. Over that temperature range, are there any mixed-metal compatibility issues, eg with aluminium, copper, brass, cast iron?; A3. None whatsoever. Evans will actually eliminate any galvanic action between different metallurgies, unlike standard water based antifreezes, this is just one of the main benefits of using Evans. Along with the elimination of the corrosion process to any component or part of a cooling system, the pressure in any system will be significantly reduced due to the fact that there is no vapour pressure to add to the expansion pressure. Evans is a “for life” product where the inhibitors within the fluid stay in solution without inhibitor drop-out. As there is no boiling and no evaporation, this eliminates the need to top-up the coolant for the time that you keep the car. Q4. Over that temperature range, is the fluid compatible with EPDM coolant hose, or hose to CODAN SAE100 R6? A4. Absolutely, Evans has no effect on hoses of any composition. Personal Comment Perhaps the greatest concern is the increased expansion with temperature of Evans coolant. If the expansion tank 'water wedges', that is fills completely, the pressure relief valve in the cap will lift, the coolant will boil under the reduced pressure, and most of the coolant will blow out. To prevent this it would seem advisable to have at least 1/3rd of the expansion tank capacity as vapour rather than liquid when at the maximum temperature. For the AC 3000ME, with 16 litres of coolant, the expansion of Evan's coolant would be about 1 litre. The expansion tank capacity is marginal and so I have not converted.
A recent technical enquiry to Evans resulted in the following replies: Q1. What is the coefficient of thermal expansion over range -20degC to +120degC, A1. The co-efficient of expansion of water based 50/50 standard automotive antifreeze is approximately 5% by volume, Evans Waterless Engine Coolant is approximately 6% by volume. Q2. Is this expansion consistent across that temperature range?; A2. Yes, this expansion rate is consistent across these temperature ranges and again similar to that of 50/50. The 6% by volume figure is based on the high end of the temperatures that you have stated above. Q3. Over that temperature range, are there any mixed-metal compatibility issues, eg with aluminium, copper, brass, cast iron?; A3. None whatsoever. Evans will actually eliminate any galvanic action between different metallurgies, unlike standard water based antifreezes, this is just one of the main benefits of using Evans. Along with the elimination of the corrosion process to any component or part of a cooling system, the pressure in any system will be significantly reduced due to the fact that there is no vapour pressure to add to the expansion pressure. Evans is a “for life” product where the inhibitors within the fluid stay in solution without inhibitor drop-out. As there is no boiling and no evaporation, this eliminates the need to top-up the coolant for the time that you keep the car. Q4. Over that temperature range, is the fluid compatible with EPDM coolant hose, or hose to CODAN SAE100 R6? A4. Absolutely, Evans has no effect on hoses of any composition. Personal Comment Perhaps the greatest concern is the increased expansion with temperature of Evans coolant. If the expansion tank 'water wedges', that is fills completely, the pressure relief valve in the cap will lift, the coolant will boil under the reduced pressure, and most of the coolant will blow out. To prevent this it would seem advisable to have at least 1/3rd of the expansion tank capacity as vapour rather than liquid when at the maximum temperature. For the AC 3000ME, with 16 litres of coolant, the expansion of Evan's coolant would be about 1 litre. The expansion tank capacity is marginal and so I have not converted.