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Coolant Mix and Overheating
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<blockquote data-quote="EDDYSW20" data-source="post: 1063385102" data-attributes="member: 82421"><p>Dear Frenz,</p><p></p><p><strong>Why a rich mix gives less cooling:</strong></p><p></p><p>Now if you've poured coolant into a radiator, you have no doubt that it is much thicker than water. That is, it has a much higher viscosity. This means that it will not flow as fast through the system as water, and the cooling effect will be less.</p><p></p><p>Further, the specific heat of antifreeze is less than that of water. This means that for a given temperature change, the antifreeze will carry less heat each time it circulates from engine to radiator and back.</p><p></p><p>So, if the mix is too rich, the cooling efficiency will be reduced because (1) the flow rate is less, and (2) less heat is transferred per cycle of the coolant. </p><p></p><p>In case you do not know, its called anti-freeze, which means its to prevent freezing in cold countries. So, in Malaysia, warm and all, the coldest you would go aint gonna freeze the coolant, never the less, you still need coolant cause coolant is also a rust inhibitor. And you need that.</p><p></p><p>One more info to note. Study has shown that, changing from a 50/50 to 20/80 mixture, has also managed to reduce the engine operating temperature by up to 9 deg celcius. Some claimed up to 11 deg celcius..... I haven't tried this experiment on my 3SGTE yet..... (gimme time)</p><p></p><p><strong>Conclusion</strong></p><p>I suggest mixing a ratio of 20% coolant and 80% water (distilled) into the system.</p><p></p><p>Todays experiment on my 3SGTE using a laser guided infrared temperature sensor (duly calibrated) after the KLIA-SZBAP run......</p><p></p><p>Radiator body (top cover 5 inches from input) 31 deg</p><p>radiator input (hose) 38 deg</p><p>radiator exit (hose) 21 deg</p><p>engine water inlet (from radiator) 20 deg</p><p>engine block (valve cover) 49 deg</p><p>exhaust manifold (near oxy sensor) 104 deg</p><p>temperature sensor adaptor 77 deg</p><p>coolant overfill cap 55 deg</p><p>piping into the radiator 70 deg</p><p></p><p>Condition: </p><p>Cockpit indication was a little lower than half (below the temp symbol)</p><p>Engine was running at idle only, only left radiator fan operating.</p><p>Outside air temperature was 30 deg celcius</p><p></p><p>Cheers guyz</p></blockquote><p></p>
[QUOTE="EDDYSW20, post: 1063385102, member: 82421"] Dear Frenz, [B]Why a rich mix gives less cooling:[/B] Now if you've poured coolant into a radiator, you have no doubt that it is much thicker than water. That is, it has a much higher viscosity. This means that it will not flow as fast through the system as water, and the cooling effect will be less. Further, the specific heat of antifreeze is less than that of water. This means that for a given temperature change, the antifreeze will carry less heat each time it circulates from engine to radiator and back. So, if the mix is too rich, the cooling efficiency will be reduced because (1) the flow rate is less, and (2) less heat is transferred per cycle of the coolant. In case you do not know, its called anti-freeze, which means its to prevent freezing in cold countries. So, in Malaysia, warm and all, the coldest you would go aint gonna freeze the coolant, never the less, you still need coolant cause coolant is also a rust inhibitor. And you need that. One more info to note. Study has shown that, changing from a 50/50 to 20/80 mixture, has also managed to reduce the engine operating temperature by up to 9 deg celcius. Some claimed up to 11 deg celcius..... I haven't tried this experiment on my 3SGTE yet..... (gimme time) [B]Conclusion[/B] I suggest mixing a ratio of 20% coolant and 80% water (distilled) into the system. Todays experiment on my 3SGTE using a laser guided infrared temperature sensor (duly calibrated) after the KLIA-SZBAP run...... Radiator body (top cover 5 inches from input) 31 deg radiator input (hose) 38 deg radiator exit (hose) 21 deg engine water inlet (from radiator) 20 deg engine block (valve cover) 49 deg exhaust manifold (near oxy sensor) 104 deg temperature sensor adaptor 77 deg coolant overfill cap 55 deg piping into the radiator 70 deg Condition: Cockpit indication was a little lower than half (below the temp symbol) Engine was running at idle only, only left radiator fan operating. Outside air temperature was 30 deg celcius Cheers guyz [/QUOTE]
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