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B112
USA
5230 Posts |
 Posted - 01/13/2008 : 07:50:52
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I am putting this in the "Other Projects" because the engine painting I want to do is actually intended on a Big Block V8 engine. Though, I'd think this might translate to an AC/Simplicity Tractor also.
I want to detail my BB engine. I've painted it before with spray cans of Mercruiser Engine Black. On my second rebuild, there were some major rust spots discovered in some hidden areas. I was told two different painting suggestions by two different repair shops. One shop told me to spray on a good "Acrylic Enamel" paint verses using POR15. The other shop recommended a rust paint like POR15. If you want to keep paint on an engine, what would you use? |
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Roy
USA
1366 Posts |
Posted - 01/13/2008 : 08:39:41
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| Think the secret is making sure the surface to be painted is absolutely clean. Hard to do with a chuck of greasy cast iron. Might want to consider having the block boiled in a cleaning tank and/or blasted with CO2 or some other non abrasive media. POR is great stuff but don't know how it holds up to heat. Would want a heat resistant paint for sure. |
Roy
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B112
USA
5230 Posts |
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B112
USA
5230 Posts |
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simplelife
USA
1385 Posts |
Posted - 02/12/2008 : 10:09:37
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While reading this topic, my mind couldn't help but wander back to the days when I was deeply involved in drag racing and building engines. It may have been an urban legend, but many racers held it to be true, so take what I have to say with a grain of salt. 
Most of the racers and engine shops preferred no paint on the blocks to aid in cooling. If you had to paint it for show, NEVER use black or a dark color. Paint it with a light color. Goes back to the principle of dark colors holding in heat while light colors reflect the heat. (cowboys don't where black hats before Labor Day or after Memorial Day) 
Another theory was to paint the inside of the block (and valley area on V-blocks) with a light colored enamel to aid in the oil return to the pan.
Just 2 cents worth of urban legend that was jolted from my memory by this L-O-O-O-N-G winter we are having. |
Edited by - simplelife on 02/12/2008 10:12:17 |
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Roy
USA
1366 Posts |
Posted - 02/12/2008 : 16:48:55
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Gang,
Any coating (i.e. paint) will act as an insulator and impede heat transfer. But if you are going to paint an engine, flat black is the best color to transfer heat away from the engine.
I have also heard about painting the inside of the block to aid oil drainage back to the oil pan.
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Roy
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ptmmatssc
271 Posts |
Posted - 09/16/2008 : 21:12:13
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"Hot bathing" first . Then an etching primer as soon as possible . Then a good acrylic high temp auto paint .
Hot bathing is also called "acid bath" .
Have done to many engines this way to count , and the only ones that developed rust etc were the ones that skipped either the bath or the primer , or were primed/painted to long after being bathed .
Just my .02 . |
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Leroy
USA
413 Posts |
Posted - 05/14/2009 : 15:27:24
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quote:
Originally posted by ptmmatssc
"Hot bathing" first . Then an etching primer as soon as possible . Then a good acrylic high temp auto paint .
Hot bathing is also called "acid bath" .
Have done to many engines this way to count , and the only ones that developed rust etc were the ones that skipped either the bath or the primer , or were primed/painted to long after being bathed .
Just my .02 .
What kind of acid do you heat up, and to what temp? How long does the block sit in this bath and what areas should be protected from the acid and with what? |
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Topic |
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Engine Painting (Spray or Brush)
