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Cold mornings have their redeeming features.

By mezla - 2 May 2012 21

Lake Burley Griffin at sunrise

I left home in the dark for a pre-dawn ride around Lake Burley Griffin on the way to work.

I stopped to admire and took a photo at about 7am.

You can’t see it in the photo, but my toes are numb.

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Cold mornings have their redeeming features.
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devils_advocate 8:48 am 04 May 12

wildturkeycanoe said :

devils_advocate said :

wildturkeycanoe said :

Another great thing about the cold is that car engines run better as the density of oxygen in the air increases, providing better combustion [more air = more power].

Not really, most cars that have a MAF also have an air temp sensor that corrects for this, otherwise your car would run super lean in the cold and super rich in the heat.

The exception is for turbocharged cars, where the compression of the air heats it up and the cold air keeps the charge air cooler, and also helps the intercoolers work more efficiently. It’s particularly effective when the car is running a small factory intercooler because it results in a vastly more efficient heat exchange. But on a naturally aspirated car it shouldn’t make a difference.

Alas, I only have a carburettor, which means cold is good. So, you are saying that those souped up power cars with cold air intakes and no turbo are wasting their time? If it is so, why do manufacturers bother to direct the air intake away from the engine bay? Because hot air does not help with power or efficiency.

In the old days it might have been the case but nowadays this sorts of things are a solved problem, the car manufacturers are chasing down every little bit of efficiency they can. Cold air intakes have bugger all effect on NA cars, unless they are big and forward facing, in which case they can create some mild positive pressure in the front of the air filter and a mild supercharging effect. A lot of people trick themselves into thinking it’s effective but really it’s just the increased noise/resonance from the larger pipe. Dyno testing tends to show it is pretty ineffective on NA cars.

But really who cares about NA cars. Life is too short to rely on atmospheric pressure.

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