Quote:
Originally Posted by Diesel911
I have disproved the Hot Air issue to my satisfaction (at least in S. CA where I live).
To summarize a test I did with a Digital Thermometer Probe under the Hood attached outside of the Metal Part of the Stock Air Filter Housing Inlet.
What I found is that as long as the Car is moving at even City Traffic speeds the under the Hood temp only rises about 5 degrees F higher than the outside temp.
However, when stopped at a long Traffic Signal the under the Hood temp shot up to 197 degrees F. But, who cares what temp the incoming Air is at idle speed.
As soon as you start moving the temp drops quickly.
If there is some sort of Belly Pan (none on my W123) I would expect the results to be different.
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I am posting this to correct the above stuff. Apparently my memory of the test was not so good. I found what I previously posted so here that is:
"I have a digital Thermometer with a probe long enough the I put it under the hood at the end of my air filter horn (Federal air filter housing) which would be about where one of those Cone type filters would be
under the hood and I ran the car on the Freeway to get it hot and drove around town and sat at some long Traffic Signals. I also put the probe all the way up front where the cold air would go into the air filter and drove around again.
I was surprised to find out that while you are moving even in slow traffic the outside and under the hood temperature is not significantly different. However, when you idle the under the hood temperature went up from the 76 degree outside temp to 98-110 degrees under the hood.
My conclusion is that you do no harm by having the end of the air intake system under the hood as it only made a differance when you sat at idle. When you start moving there is enough air flow that you get the colder outside air anyway.
If you want to try the experiment youself (cheaper than a new intake system) I bought the thermometer at Target and it has a 36 inch long steel braided covered wire. You are supposed to stick the probe in what you are cooking in the oven to measure the inside temp of it and run the cable out of the oven door and the Digital display has magnets on the back to stick to you oven/car hood. I believe it cost around $16.
Get someone with good eyes to ride along with you to do the reading of the thermostat."