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On 10 Jun 99, at 9:44, Nuttall, Phil wrote: > > From: Jim Adney [SMTP:jadney@vwtype3.org] > > > > Nothing comes very close to a perfect "black body," certainly not > > a VW case in any condition or color. > > I know it's not really possible, but theoretically, would a case > absorb the heat better with the inside painted black or the outside? > Don't panic, I wasn't contemplating it! I just wondered. Wow, a really good question. The answer is yes, but insignificant. The reason that it is insignificant is that the vast majority of the heat transfer is by contact of the hot oil against the inside of the case. So there is little role played by radiative heat transfer inside the case. I say this under the assumption that the inside is made black without adding any insulating paint layer there. If you use real paint, the answer is not so clear. Jim - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------------------------- List info at http://www.vwtype3.org/list or mailto:help@vwtype3.org