<VV> Head Fins: How Smooth/Clean?

[Ron]

Surely you intend to do a fin efficiency analysis prior to engaging in any 
such nonsense!
RonH

----- Original Message ----- 
From: "Ken Campbell" <deltainc at grm.net>
To: <virtualvairs at corvair.org>
Sent: Saturday, June 25, 2005 2:52 PM
Subject: Re: <VV> Head Fins: How Smooth/Clean?


>
> ----- Original Message ----- 
> From: "N. Joseph Potts" <pottsf at msn.com>
> that the closer I can get these flash vestiges
>> to disappearing, the better my heads will be cooled. And this exercise
>> brings me to thoughts about the REST of the cooling fins that the cooling
>> air passes over (the parts upstream and downstream of the point where the
>> flashing is found).
>>      If anyone has any actual experience to report from, or solid
>> thermodynamic theory, I'd love to hear about it, preferably in a POST to
> the
>> list. Thanks.
>> Joe Potts
> ***********
> For practical purposes, its a matter of balance between maximum surface 
> area
> possible, and air molecule exposure to ( movement over )  ( or away from )
> those surfaces to carry away the energy ( heat ) .
>
> I would suspect that the gain is in the direction of keeping the surface
> Rough, as opposed to smooth, regarding the bumps as millions of little
> cooling fins (g) ....
>
> ..... as a guess also, the bumps might even help the flow of the air over
> the major shape to " burble" and help expose the hot metal to more cooler
> air ... I would envision a very smooth fin with a smooth air flow to only 
> be
> exposed to a small layer of cooler air nearest the metal ....
>
> ... as long as we are using up 20 horses of fan power to blow cool air, it
> would be best to try to get every air molecule exposed to the hot metal
> surfaces ....
>
> ... in our machine shop, we create crates of aluminum shavings ( aluminum
> wool .... looks like christmas tinsel ) ; I have often wondered how I 
> could
> weld some strips of this stuff onto the heads to increase the surface area
> by 3 or 3000 times ... kinda a Saskuatch furry vair engine, I guess ....
>
> *******
> at one time, in our toy cars ( air cooled engines ) we bolted big plates 
> of
> aluminum ( has fast internal energy transfer )  to the engine heads, and
> then screwed in essentially a bunch of rods into the big plate, stuck out
> into the air stream ( from the cars whizzing thru the air ) .... this
> worked, although ugly, bulky, and heavy.
>
> ........... while we are taking up space, maybe I could mention another
> thought, that we could make a lot better use of the engine block... or
> rather, engine block cooling ... since the engine block for vairs is
> aluminum, I bet it soaks up a lot of energy from the heads, and I believe
> there could be good benefit from taking a look at increasing energy loss
> from the block.
>
> Instead of teensy insulated motor mounts, maybe we should look at big (
> large contact area ) girdle mounts of some kind, with fins and rough
> surfaces galore ...
>
> keep cool ... ken campbell, iowuh vair guy ...
>
>
>
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