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That seems like a fairly inefficient way to address the issue...like using wood to reinforce a steel structure.  The cooling system is there to extract energy after combustion, not before.  An extra 10* in coolant temp will hardly matter to the mix, as there just isn't enough time or surface area to make a big difference to the intake charge. 


The best way to address knock is by lowering intake air temps with an intercooler.  Even adding a little duration to the injector pulse has more leverage on safety margin than coolant temps.


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