I suggest use a radiator(or something similar) because I dont think is very eficient use a bottle with ice cubes because every run you need to refill with more ice cubes and What happen if the water from the bottle is warm? There isnt a cooling system, you are using hot water for heat the motor. Just my suggestion
About the pump:
I am using a 12v pump and rigth now is working with just 6v( from the reciever)and is working perfect
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Sl4sh MM2
T-Maxx 3.3
Summit 1/10
Sl2sh VXL