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nextgen
Samba Member
Joined: August 19, 2004
Posts: 6032
Location: CONGERS, N.Y.
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DeathBySnuSnu
Samba Member
Joined: August 25, 2012
Posts: 1183
Location: MS
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 Posted: Wed Sep 19, 2018 4:09 pm Post subject: Re: Why black paint? |
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I have a thread to talk about the murdercycle.
I am happy to chat it up about the details.
https://www.thesamba.com/vw/forum/viewtopic.php?t=...mp;start=0
Back to the topic at hand.
I believe in the coatings. The insulating coatings for the chamber and piston top especially so. I have done a lot of small engine racing, motorcycles and go karts. Have been there and seen first hand how much stuff can melt when running alchohol/nitro blended fuels. Get in a hurry and throw your little high string engine together without coating your new piston. Thinks will seem fine until it gets fully heat soaked and loaded at the same time.
No experience with the outside coatings.....so new to trying them.
As far as paint on tins.......
Dont chrome the insides.
Lightly flat black the inside.
Put whatever you like the looks of on the outside.
_________________
| modok wrote: |
| And look at the SHAPE of the curves, just smooth, like gods own slingshot. . |
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67 Sunroof
Samba Member
Joined: February 22, 2014
Posts: 1836
Location: Salisbury, MD
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| Posted: Tue Oct 16, 2018 9:23 pm Post subject: Re: Why black paint? |
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Wow, I posted my question, took a haiatus and come back to this!
Woah!
I am about to apply some of my learning to another air cooled scooter motor.
I’m thinking the cooling fins around the head should just be left aluminum and unpainted to help dissipate the heat better. Paint will only slow down the thermoconductivity (is that the proper terminology?) of the heat trying to escape the engine is my thinking.
That was an excellent read though!
Next question!!!!!!!
What do companies” ceramicoat” their products claiming to aid in cooling?
Isn’t this a legitimate practice??? |
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modok
Samba Member
Joined: October 30, 2009
Posts: 26790
Location: Colorado Springs
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| Posted: Tue Oct 16, 2018 9:36 pm Post subject: Re: Why black paint? |
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I would guess... so they don't rust. I don't know what kind of products you mean.
I don't see any paint on aluminum heat sinks, but if they are iron or steel then you have to do something, and it could be that certain types of paint are better than others, and possibly better than conversion coatings. |
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Max Welton
Samba Member
Joined: May 19, 2003
Posts: 10697
Location: Black Forest, CO
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rodeking
Samba Member
Joined: October 09, 2017
Posts: 369
Location: near Buffalo NY
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| Posted: Wed Oct 17, 2018 5:40 am Post subject: Re: Why black paint? |
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I like black, doesn't show the oil leaks as much.
But if I'm using Royal Purple then I paint them purple.
Cummins used tan on their original 12 valves so the Cummins mechanics could see where the leaks are, which was just about every joint on them. But I luv them anyways..just like I luv old Harleys. |
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67 Sunroof
Samba Member
Joined: February 22, 2014
Posts: 1836
Location: Salisbury, MD
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| Posted: Wed Oct 17, 2018 7:52 pm Post subject: Re: Why black paint? |
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| modok wrote: |
I would guess... so they don't rust. I don't know what kind of products you mean.
I don't see any paint on aluminum heat sinks, but if they are iron or steel then you have to do something, and it could be that certain types of paint are better than others, and possibly better than conversion coatings. |
I’m thinking of headers-companies ceramic-coat their headers to help keep them cooler. |
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67 Sunroof
Samba Member
Joined: February 22, 2014
Posts: 1836
Location: Salisbury, MD
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| Posted: Wed Oct 17, 2018 7:55 pm Post subject: Re: Why black paint? |
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| modok wrote: |
Cool idea
They should paint toyota truck engines red so it hides the blood. Every one I ever fixed i end up bleeding. |
And why did you say that? Is it because their engines are tight in the engine bay? |
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slalombuggy
Samba Member
Joined: July 17, 2010
Posts: 9147
Location: Canada
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| Posted: Wed Oct 17, 2018 8:04 pm Post subject: Re: Why black paint? |
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| 67 Sunroof wrote: |
| modok wrote: |
Cool idea
They should paint toyota truck engines red so it hides the blood. Every one I ever fixed i end up bleeding. |
And why did you say that? Is it because their engines are tight in the engine bay? |
If you have to ask you haven't worked on one.
brad |
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Max Welton
Samba Member
Joined: May 19, 2003
Posts: 10697
Location: Black Forest, CO
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| Posted: Wed Oct 17, 2018 8:46 pm Post subject: Re: Why black paint? |
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| 67 Sunroof wrote: |
| modok wrote: |
I would guess... so they don't rust. I don't know what kind of products you mean.
I don't see any paint on aluminum heat sinks, but if they are iron or steel then you have to do something, and it could be that certain types of paint are better than others, and possibly better than conversion coatings. |
I’m thinking of headers-companies ceramic-coat their headers to help keep them cooler. |
I guess I don't understand that. If I read it right, ceramics are essentially ... clay ... an excellent thermal insulator. Wouldn't ceramic make the exhaust hotter by holding in the heat?
Max
_________________
1967 Type-3 Fastback
Under the Knife https://shoptalkforums.com/viewtopic.php?f=24&t=151582
Home Stretch https://www.thesamba.com/vw/forum/viewtopic.php?t=767836 |
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modok
Samba Member
Joined: October 30, 2009
Posts: 26790
Location: Colorado Springs
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| Posted: Wed Oct 17, 2018 8:48 pm Post subject: Re: Why black paint? |
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| 67 Sunroof wrote: |
| modok wrote: |
I would guess... so they don't rust. I don't know what kind of products you mean.
I don't see any paint on aluminum heat sinks, but if they are iron or steel then you have to do something, and it could be that certain types of paint are better than others, and possibly better than conversion coatings. |
I’m thinking of headers-companies ceramic-coat their headers to help keep them cooler. |
maybe if they coat the INSIDE of the tubes....... it would |
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HeyWatchThis
Samba Member
Joined: April 11, 2016
Posts: 96
Location: SoDak
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| Posted: Wed Oct 17, 2018 10:15 pm Post subject: Re: Why black paint? |
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| Yeah I think ceramic coatings on exhaust is because the ceramic stuff holds up to the temperature. |
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modok
Samba Member
Joined: October 30, 2009
Posts: 26790
Location: Colorado Springs
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| Posted: Wed Oct 17, 2018 10:40 pm Post subject: Re: Why black paint? |
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It can go both ways.
HBN is a ceramic material, but it has pretty good heat transfer rate, and funny thing is, it's naturally white  |
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67 Sunroof
Samba Member
Joined: February 22, 2014
Posts: 1836
Location: Salisbury, MD
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| Posted: Sat Oct 20, 2018 7:18 pm Post subject: Re: Why black paint? |
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Oh God don’t start the color debate again!
Hahaha |
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daos
Samba Member
Joined: January 01, 2017
Posts: 309
Location: Stockholm, SWE
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| Posted: Wed Jul 15, 2020 3:27 am Post subject: Re: Why black paint? |
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| why is everyone obsessing about engine tin? this subject is more relevant to the cylinders and block. |
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