Robert,
Sounds like an extract from the alcoa engineering handbook as they have done
extensive testing in this area using all types of alloys/steels.They say that
with smooth finished steel that heat emissivity is only 10% of the same surface
with a thin coat of black paint.This is why most cars have black sumps.Its a
bit different with rough cast allows as this has around 90% emissivity of the
same surface with a thin coat of black paint.This becomes worse as the surface
get smoother.They say that the ultimate in heat emission is black anodising.
There also a bit on this subject in tha datsun race book on page 76 under using
your engine as an oil cooler.The datsun book refers to using a non insulating
type of black paint on aluminium.
Andrew Smith
Robert Palmonari wrote:
> Hi All,
> I don't know much about intercoolers but I did read an interesting fact
> about rocker (cam) covers recently.
> According to my info a black painted cam cover will dissipate heat about 10
> times more than a bare alloy one. I remember being very suprised by this
> info and that's why it stuck in my head. I'll try and find the source to
> quote. Maybe that is why so many (older) cam covers are black.
> I can't understand why this is but I know black surfaces absorb heat (from
> sunlight etc) better.
>
> -my 2 cents worth
> Rob P
>
> Topic: intercooler color
> ===================
> Date: Wed, 25 Jul 2001 22:23:45 +1000
> From: "Brad Hallett" <[EMAIL PROTECTED]>
> ----------------------------------------
> I wouldn't paint it at all or polish it. Maintain a bare alloy or brushed
> alloy surface to increase surface area in order to assist heat dissipation
>
> Brad Hallett
> http://www.powerup.com.au/~bhallett
>
> http://www.datrats.com.au for the best in Nissan Motorsport Equipment
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Cleary Signs
> Sent: Tuesday, 24 July 2001 8:00 AM
> To: [EMAIL PROTECTED]
> Subject: Re: intercooler color
>
> my mates temp sensor on his cooler showed that being silver
> was heaps cooler than the original black. he paint stripped the black off
> stick with plain alloy
>
> Heath
> ----- Original Message -----
> From: "Rick White" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Wednesday, 25 July 2001 3:09
> Subject: Re: intercooler color
>
> > Hi all My therie for colour choice for intercoolers would be this.
> > Plain alloy for the people who wanna have it seen.
> > Factory ones are normally black less visable.
> > And I don't think black will let the heat out of any thing quicker or
> slower otherwise radiators would be plain alloy colour aswell.
> > Maybee the only reason not to paint your itercooler is that the fins have
> smaller gaps that could be filled by paint stopping the air from flowing
> through from the front to the back.
> > just like going through a swarm off bees or locusts.
> >
> > A good swarm could in therie choke youur radiator or intercooler up not
> letting the air pass through.
> > this is my thoughts.
> > Rick White.
> >
> > --- "Wojee" <[EMAIL PROTECTED]>
> > > wrote:
> > >If someone has concrete evidence . i would love to hear it..... but my
> > >belief is that black absorbs more heat.. hence must also dissipate it
> > >equally well..........
> > >----- Original Message -----
> > >From: "robert hall" <[EMAIL PROTECTED]>
> > >To: <[EMAIL PROTECTED]>
> > >Sent: Tuesday, July 24, 2001 8:33 PM
> > >Subject: intercooler color
> > >
> > >
> > >>
> > >> hi, any thoughts on wether a intercooler should be painted black or
> > >> silver?
> > >>
> > >>
> > >> mark
>
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