Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

> push rod tube, to paint or not
jacksun
post Jul 1 2014, 11:43 AM
Post #1


Member
**

Group: Members
Posts: 236
Joined: 8-August 13
From: mi
Member No.: 16,224
Region Association: Upper MidWest



Hi,

got my first push rod tube cleaned up and would like to paint it with

hi-temp paint? any problems doing so?

tks

randal
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
 
Reply to this topicStart new topic
Replies
stugray
post Jul 7 2014, 06:07 PM
Post #2


Advanced Member
****

Group: Members
Posts: 3,825
Joined: 17-September 09
From: Longmont, CO
Member No.: 10,819
Region Association: None



QUOTE
but in this or that application who really cares about radiation?

That's exactly what I have been saying as well.
QUOTE
with an engineer going through the math and apparently contradicting both the conclusions in that Mighty Mods video and some of your points:


Nothing the engineer said in his video contradicts what I said above.
My explanation above was merely in response to your statement :
QUOTE
Sorry, can't believe that, no way. Bare metal (aluminum anyway) convects heat best, and that's science. What manufacturer can you think of who paints their aluminum radiators or intercoolers? Radiator paint was used back when radiators were brass to reduce corrosion, which did reduce convection, but even unpainted brass transfers heat better than painted.


Martin Marietta (Now Lockheed Martin) patented the best "Radiator Paint" known to man.
It is called "Martin Black" and has been used to paint radiators by the military for years.
It is known for it's emissive properties but help cooling by convection as well.

One way to think of it is:
If you polish the metal surface really well, the air will move over it in a laminar flow and have little actual "contact time" with the surface.
If you make the surface rough by either sandblasting it, sanding/etching it or coating it you can make it transfer heat better by convetion than bare polished metal.
It does this by causing more turbulence near the surface.

So you CAN make a surface better at convection by changing it's surface properties.

Sandblasting or aluminum plasma spray would make a much more effective convective surface than polished aluminum.

Would a paint be better than polished aluminum?
Not likely if you choose your paint at random, but definitely possible.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post

Posts in this topic
jacksun   push rod tube   Jul 1 2014, 11:43 AM
914Sixer   Paint holds heat. They were plated gold or clear ...   Jul 1 2014, 02:13 PM
jacksun   hmm ..... now I have four painted.............. f...   Jul 1 2014, 04:59 PM
Mike Bellis   Has anyone really done a study to find out how muc...   Jul 1 2014, 05:24 PM
Mike Bellis   BTW, Kirchoff's Law of Thermodynamics basicall...   Jul 1 2014, 05:34 PM
jacksun   just kidding about the purple....... they are blac...   Jul 1 2014, 05:37 PM
Mike Bellis   just kidding about the purple....... they are bla...   Jul 1 2014, 06:07 PM
swooshdave   Some of you are worried that a little paint on the...   Jul 1 2014, 06:08 PM
Mike Bellis   Some of you are worried that a little paint on th...   Jul 1 2014, 06:12 PM
r_towle   Some of you are worried that a little paint on th...   Jul 1 2014, 07:20 PM
swooshdave   What happens if I paint my jackstands? (oops, I h...   Jul 1 2014, 07:25 PM
PlantMan   What happens if I paint my jackstands? (oops, I ...   Jul 1 2014, 07:59 PM
malcolm2   I painted mine..... But masked off the o-ring sea...   Jul 1 2014, 08:04 PM
PanelBilly   It it looks good then do it. Are you going to race...   Jul 1 2014, 08:18 PM
malcolm2   It it looks good then do it. Are you going to rac...   Jul 1 2014, 08:21 PM
Keyser Sose   All the oil that goes to the rocker assemblies, wh...   Jul 1 2014, 08:49 PM
jacksun   http://www.vw-resource.com/cooling_qa.html ...   Jul 2 2014, 04:56 AM
Keyser Sose   Oil 'dribbles' back? Sure, at idle. Fift...   Jul 2 2014, 12:23 PM
stugray   The old wive's tale of "Black gets hott...   Jul 2 2014, 01:19 PM
Java2570   And we all know what happened to Dr. Malcolm in Ju...   Jul 2 2014, 01:47 PM
WLD419   I went ahead and painted mine :) , I ended up us...   Jul 3 2014, 04:01 AM
stugray   What's with the plug wires? Must be dual plug...   Jul 3 2014, 08:03 AM
WLD419   What's with the plug wires? Must be dual plu...   Jul 3 2014, 08:23 PM
barefoot   Sorry, slight thread hijack, but an order of magni...   Jul 3 2014, 08:36 AM
barefoot   xx   Jul 3 2014, 04:06 PM
stugray   Funny that I stumbled across this after this discu...   Jul 6 2014, 10:49 PM
jacksun   thanks for the link   Jul 7 2014, 06:08 AM
Keyser Sose   Sorry, can't believe that, no way. Bare metal...   Jul 7 2014, 06:53 AM
stugray   I think that the point was: "Black painted ...   Jul 7 2014, 07:14 AM
Keyser Sose   You're talking about the point in that video, ...   Jul 7 2014, 12:32 PM
stugray   Yes, and it also applies to this discussion. 1 ...   Jul 7 2014, 01:06 PM
Keyser Sose   In the video you posted the black paint really imp...   Jul 7 2014, 04:16 PM
stugray   That's exactly what I have been saying as wel...   Jul 7 2014, 06:07 PM
Keyser Sose   OK, reality check. Stu, we're talking about p...   Jul 7 2014, 07:54 PM
stugray   OK, reality check. Keyser - First I said it doesnt...   Jul 7 2014, 10:09 PM
Highland   I just watched both u-tube videos and it seems lik...   Jul 8 2014, 05:39 PM
Mike Bellis   I knew this would turn into a good debate... :evil...   Jul 8 2014, 06:04 PM


Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 



- Lo-Fi Version Time is now: 11th July 2025 - 06:51 AM