![]() ![]() Similarly, oil isn’t an ideal coolant, as oil doesn’t conduct or carry heat very well. So air cooling is only effective on small engines, bikes like the Honda Grom, or engines not intended to rev very high and produce a lot of power, like most cruiser engines. But as time has gone on, we’ve refined the way we’ve fuelled our engines, running leaner fuels and at higher compression, in an effort to both increase efficiency and power. It’s fine when it’s cold out and the engine doesn’t get too hot. The problem with air cooling is that air isn’t the best coolant. Then, bikes became air/oil-cooled, and now many are air/liquid-cooled (i.e. Air cooling fins on a modern Harley-Davidson 117 engine That’s why we know cylinder heads of big air-cooled bikes have fins on them - to help the air get to more surface area. It’s the same basic reason why a light bulb gets hot (especially older, filament-style bulbs) - they’re far less than 100% efficient at converting electricity to light, and the waste radiates out as heat.Ĭombustion engines have always been cooled in some way. This is also true for electric motors - so even larger electric motorcycles (like the Livewire) are liquid-cooled. That takes heat away from the liquid flowing through the radiator.Įngines are hot because they’re not 100% efficient at converting fuel to kinetic energy - they’re closer to about 30% efficient. The goal of engine coolant is to help transfer heat from the engine to the air outside, via the radiator.Īir blows through the radiator - or is impelled through by the radiator fans. ![]() Please enable JavaScript in your browser to submit the form What’s the Goal of Engine Coolant?
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