<VV> how hot is my piston but not push rod tube / oil / exhaust manifold, etc

[djtcz at comcast.net]

here is a link to a tech paper investigating effect of varying the thickness of a thermal coating on diesel piston temperature.  Looks like a batch of previous theoretical work used to make up, I mean calculate, the "boundary conditions" for the edges of ths solid model made in an FEA program by folks at a fine US university.   No engine parts were harmed in the writing of this tech paper.

The coating is not barbecue paint, and the thineest coating was 0.1 mm (0.004 inch).  0.004 inch is a thick paint job. But I thought it was moderately interesting anyway.  I believe The conclusion on page 6 is "thicker coating, cooler piston"

Note all the heat transfer in the solid model is conduction, since within the model there are no fliuds available for convection, or separated surfaces for radiation.

The names of most of the contributors and authors of the cited references only reinforce the common perception that folks from other lands may take education a bit more seriously than "we" do.

http://www.mrs.org/s_mrs/bin.asp?CID=2504&DID=57892&DOC=FILE.PDF

--
Dan Timberlake

-------------- Original message -------------- 
> From: "Western Canada CORSA" 
> To: "'Ron'" ; "'Andy Clark'" ; 
> 
> Sent: Saturday, March 24, 2007 2:04 PM 
> Subject: RE: 64 Engine in 65 / Oil leaks 
> 
> 
> It strikes me as being a bit like yellow sunglasses. Because they block the 
> blue part of the spectrum, they increase the contrast of what is being 
> viewed. However, they do it by blocking the blue end of the spectrum, 
> making thing that reflect blue light DARKER, so in fact you have less 
> visable light entering your eye, so you are seeing less. It just fools the 
> brain because it has increased the contrast level. 
> 
> I can't grasp how an extra coating on the push rod tubes would help them 
> radiate more heat. To me, it's just another insulating layer the heat from 
> the oil has to pass through before it can "get out". And as for the old 
> "half the tubes white VHT", I guess it would depend on what was more 
> reflective, the bare shiney metal, or the VHT white. 
> 
> Regards, 
> Joel 
>