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Underbonnet temps

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Fen

Non Member
OK, 2 apologies:[FONT=verdana,geneva"] [FONT=verdana,geneva"]I nicked this from Rennlist but not everyone here is on there.[FONT=verdana,geneva"] [FONT=verdana,geneva"]It's primarily Turbo specific.[FONT=verdana,geneva"] [FONT=verdana,geneva"]Is the inlet manifold better to be thermal coated to prevent heat transfer or to promote heat transfer? In answering bear in mind that the turbo sits directly below the inlet manifold but also that the air inside it has been compressed but passed through the intercooler.[FONT=verdana,geneva"] [FONT=verdana,geneva"]My guess would be that the external temps would be higher (so it should be protected against heat transfer) but Rennlisters seem to think otherwise. Anyone got any opinions to share?[FONT=verdana,geneva"]
 
ORIGINAL: Fen

OK, 2 apologies:[FONT=verdana,geneva"] [FONT=verdana,geneva"]I nicked this from Rennlist but not everyone here is on there.[FONT=verdana,geneva"] [FONT=verdana,geneva"]It's primarily Turbo specific.[FONT=verdana,geneva"] [FONT=verdana,geneva"]Is the inlet manifold better to be thermal coated to prevent heat transfer or to promote heat transfer? In answering bear in mind that the turbo sits directly below the inlet manifold but also that the air inside it has been compressed but passed through the intercooler.[FONT=verdana,geneva"] [FONT=verdana,geneva"]My guess would be that the external temps would be higher (so it should be protected against heat transfer) but Rennlisters seem to think otherwise. Anyone got any opinions to share?[FONT=verdana,geneva"]
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IMHO i bet it make SFA difference

Caoting the manifod and crosover pipe yes but the inlet. Get the intercooler sorts, the air in the inlet must be traveling pretty quick, (easy to calculate) not enought time to absorbe much heat anyway. You could always wrap copper pipe round it and connect to the AC unit :)

 
ORIGINAL: slim_boy_fat
IMHO i bet it make SFA difference

Caoting the manifod and crosover pipe yes but the inlet. Get the intercooler sorts, the air in the inlet must be traveling pretty quick, (easy to calculate) not enought time to absorbe much heat anyway. You could always wrap copper pipe round it and connect to the AC unit :)
Click to expand...
[FONT=verdana,geneva"] [FONT=verdana,geneva"]It'll have to be a helluva long copper pipe to reach from my garage to Silverstone [;)][FONT=verdana,geneva"] [FONT=verdana,geneva"]I think you might be right about making next to no difference.[FONT=verdana,geneva"]
 
Completely agree with slim [:D] [:D]

The airflow rate through the inlet manifold when it matters - at high RPM/Boost - is going to be so great that I doubt it would have the slightest noticable effect.


 
I don't disagree, and I haven't done anything with mine other than clean it up, I just thought the logic on Rennlist was interesting and not necessarily what I would expect.
 
Call me stupid, but isn't idea of an inter"cooler" supposed to keep the inlet air temperature down? Of course you want to prevent heating it up!
 
Without definite figures from temp sensors, I think it's really difficult to judge either way.

Certainly at speed I bet the underbonnet temperature is not so bad anyway (especially if the exhaust manifold was wrapped).

Personally I'm sceptical about coating the inlet side
 
Here in the States a couple guys actually did do some tests on underbonnet temps on the 951, which is going to be hotter than the NAs. Once you hit around 30 mph the temps drop to more or less ambient.

There was also an outfit in Australia that tested the charged side of the intake when experimenting with water spray on the intercooler as well as water injection. That may still be up on the web somewhere. As I recall from that the big issue was developing a system to anticipate when you would be jumping on boost and start the spray sooner rather than later. The intercooler acts more like a big heat sink rather than an active heat exchanger so you want to keep that as cool as possible at all times. By the time the air charge is past the intercooler it is too late to do anything other than inject water into the airstream.
 
Then you can always go for a CryO2 installation (see page 222 Demon Tweeks 2005 - Chav - Catalogue) spraying CO2 directly onto the intercooler fins and "...enhancing the performance of the intercooler be more than 50%......"

Or a CryO2 fuel bar to reduce the fuel temperature.

And finally, you have got to have the CryO2 purge kit allowing you to vent CO2 out from under the bonnet ".....to show off with a blast of CO2..."

With a timer switch "..... a 10lb tank can last up to 60 minutes"

Strewth! How cool is that?
 
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