I'd think so. The coating had better stay adhered, though; you don't want
it sucked into your engine. There are some really decent low-conductivity
plasma coats and paints out there. I'd think a coated intake would cost
about the same as coating your pistons. But I don't know what's good or
what even works.
-----Original Message-----
From: Richard Cranium [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, March 06, 2001 2:38 PM
To: Sentra Mailing List
Subject: RE: SML: Re: Phenolic Spacers
Composite plastic intake manifolds are being produced in industry right now.
GM makes em for one of their v6s. They claim that they remain cool, weigh
less, and are cheaper to produce since other components can be integrated
into the molds. The last issue of the SAE magazine had an article about
plastic manifolds too, cant remeber the specs off the top of my head though,
i'll check it out.
i wish my cars manifold could keep cervezas cold!
on the note of thermal conductivity, the Summit import catalog is selling a
sort of heat reflecting "sleeve" for cai's. At $50 a pop, its kind of
expensive. wouldnt a low conductive coating on the cai have the same effects
if any for less? How much do these coatings cost? My old battery leaked all
over my PR CAI and im stuck between powder coating and the heat coating the
pipes.
thanks
Javier
>
>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
>
>
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