<VV> White pushrod tubes

Ron ronh@owt.com
Fri Feb 4 23:05:38 EST 2005


Very well said, you a teacher?
RonH

----- Original Message ----- 
From: "Roger Gault" <r.gault@sbcglobal.net>
To: "Corvair List" <virtualvairs@corvair.org>
Sent: Thursday, February 03, 2005 1:18 PM
Subject: Re: <VV> White pushrod tubes


> It's very difficult to say anything authoratative about this because the
> needed data on "the paint" is not available.  (Well, it's actually easy to
> say something, it's just hard to be sure you're right.)
>
> At visible light wavelengths, it's a piece of cake.  Anybody that doesn't
> believe that white absorbs less radiated energy than other colors at solar
> frequencies is welcome to bring a convert down here to the Texas sun and 
> sit
> in it in shorts.  Then come sit in my white interior and you'll be a
> believer.
>
> Assuming our friendly exhaust tubes are running about 1000 degrees F,
> they're radiating with a broad spectrum ranging from about 2 microns up to
> around 5 (compared to solar radiation which is down around .5 to 1 micron.
> Most non-conductive materials show a large increase in absorptivity above
> 2-3 microns, so there aren't many good non-conductive reflectors in
> infrared.  Chances are that your random rattle can white exhaust paint is
> going to have an absorptivity around .5 to .6, but we'll never know 
> because
> the data's not on the can.  It might be more like .8.  Chances are that
> black paint that starts out around .9 at solar frequencies is not going to
> get a bunch better and be as reflective as the white.  So, you pays your
> money and takes your chances.
>
> Interestingly, the stock "shiny" metal tubes are probably down around .2 
> to
> .3, so they're better that any painted surface.  Until they rust and their
> absorptivity goes up to maybe .8.  Metalic materials usually get more
> reflective in infrared.
>
> So, if you have nice clean, metal tubes, I'd stay away from the paint.  If
> yours look like they've spent their entire life at the beach, paint them
> like I did my rusty ones - you can't be any worse off.  Of course you 
> chrome
> them.  Or you can do what Finch recommended and put a barrier of .020
> aluminum between the exhaust and the pushrod tubes.
>
> Roger Gault
> Home sick with a sore throat and thankful I have you guys to entertain me.
> ;-)
>
>
> ----- Original Message ----- 
> From: "Ron" <ronh@owt.com>
> To: <virtualVairs@corvair.org>; "Dave Morris" <BigD@davemorris.com>
> Sent: Friday, February 04, 2005 2:15 PM
> Subject: Re: <VV> White pushrod tubes
>
>
>> Yes, there's no analytical basis using the empirical formulas available
> for
>> heat transfer to to say that white paint is any better than any other
> paint.
>> If you have any indication otherwise from a college level text, let us
> know
>> because that means that something new has been found in the basic heat
>> transfer field.
>> RonH
>>
>> ----- Original Message ----- 
>> From: "Dave Morris" <BigD@davemorris.com>
>> To: <virtualVairs@corvair.org>
>> Sent: Friday, February 04, 2005 11:34 AM
>> Subject: Re: <VV> White pushrod tubes
>>
>>
>> > You have evidence that painting something with a VHT white paint will
> not
>> > limit its tendency to soak up heat from the exhaust pipes next to it?
>> >
>> > Dave Morris
>> >
>> >
>> > At 11:17 AM 2/4/2005 -0800, you wrote:
>> >
>> >>On the item of using white paint, Finch was without a basis, I'm sure.
>> >>Save your paint.
>> >>RonH
>> >>
>> >>----- Original Message ----- From: "Dave Morris" <BigD@davemorris.com>
>> >>To: <virtualVairs@corvair.org>
>> >>Sent: Friday, February 04, 2005 9:46 AM
>> >>Subject: Re: <VV> An interesting thing.....
>> >>
>> >>
>> >>>
>> >>>We paint the pushrod tubes white because Richard Finch in his book 
>> >>>"How
>> >>>to keep your Corvair alive" suggests that as a way to prevent leaks
>> >>>around the o-rings.  Almost ALL of us are painting them white.
>> >>>
>> >>>
>> >>>Dave Morris
>> >>>
>> >>>
>> >>>
>> >>>At 11:24 PM 2/3/2005 -0600, you wrote:
>> >>>
>> >>>>
>> >>>>I note that he claims painting pushrod tubes white helps to keep heat
>> >>>>away from the cylinders.  Don't know if I buy that one or not.
>> >>>>
>> >>>>
>> >>>>Later, JR
>> >>>>Of IL
>> >>>>'61 Rampside Standard 4/110
>> >>>>'65 Monza Convertible 4/140
>> >>>>'66 beater Coupe - icemobile 4/140
>> >>>>_______________________________________________
>> > _______________________________________________
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