Now, empirical data:
@ 30°C ambient temperatures, max water and oil temps, whilst sitting in traffic, rise to mid nineties: I've seen 94°C for water and 96°C for oil. It doesn't rise beyond this. Looking at traffic through a column of heat haze is very satisfying. Under-bonnet temps rise to over 50*C (my gauge's max for these two sensors) sitting in traffic too, but cool to low forties when travelling at 60kph for a few minutes. Oil and water cool to low-to-mid eighties when travelling at 60kph for a few minutes, too. The under-bonnet temps used to climb into the 50+°C range and never return under all conditions prior to fitting the vents. I have noticed that 60kph is the minimum speed to start to reduce temps. This must be when the Bernoulli effect starts to draw air out through the vents properly.
I can confidently say that my rig is now Queensland-proof as far a general heat management goes
As far a water management goes, the vents ended up sitting further forward than I had feared and only expose the very front of the power steering pump, alternator and A/C compressor. It essentially has the pulleys and drive belt exposed. One day, whilst parked at work, it drizzled all day and the water ingress was as expected, but to very little detrimental effect. It started up just fine. One pulley had a tiny smidge of surface rust on it that the belt would have eaten quick-smart.
Tonic wrote:Yes looks good. For aesthetics another pair towards the windscreen and a similar distance from the fold would might (at least) look better but may also get more of the hot air out from around the back of the engine? Not much electronics under there being just inside the shock towers?
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