No, he mounted the sensor ON the input runner. On the OUTSIDE. Even if he
mounted it on the inside, he would have to mount it out into the airstream
and insulated from the manifold. Also he'd have to mount one in the middle
of the airstream and basically try and map the temperature across the
volume. His temperature "deltas" are the difference between manifold
surface temperature and ambient temperature. All that data shows is the
spacer helps keep the manifold cooler. When I first looked at it I thought
"WTF? He's getting 40 degree manifold temperatures on a 75 degree day? He
could keep beer cold on that!" But it was not to be.
Heck, if manifold temperature were an issue then you could easily reduce
charge temperature by going to a cast iron intake manifold. Why? Cast iron
has less than one third the thermal conductivity as aluminum. Although cast
iron also has half the specific heat, it's three times as heavy for a given
casting volume, so the heat energy contained in the same casting of cast
iron is 50% more than an aluminum casting. But since the thermal
conductivity is a factor of three lower, the manifold would act as an
insulator and would cool down to a lower equilibrium temperature.
So...there are a number of things that could be done production-wise to
decrease charge temperature globally, assuming that is a problem area.
First, you could keep the aluminum manifold and apply a low-conductive
coating or paint to the inside to minimize convection heat transfer.
Second, you could make the manifold out of tubular stainless steel, which is
pretty and has thermal conductivity 6 times less than cast aluminum, as
well as being lighter than cast aluminum and hence would carry less heat.
Third, you could go to insulator materials such as high-temperature
plastics, which would remain cool to the touch under nearly all conditions.
Well...I said more than I needed to. But you'd have to show me the data.
And it's not to be had right now I don't think.
Dave
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, March 06, 2001 5:22 AM
To: Sentra Mailing List
Subject: Re: SML: Re: Phenolic Spacers
I thought he did use some sort of device to measure temp in the intake
runners. But I my have misread it.
Marcus
<< True, testing with a some sort of measuring device will probably give the
best results.
>>
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