Is there a reason grown men do this?

[05ridgeback]

Check with S&S or any engine manufacturer, and they will tell you the same thing. DON'T powder coat after machine work.
I've had to cut valve seats, replace guides and seats, bore out of round cylinders, etc. because of the hi-heat distortion caused by powder coating. :bang: Why do you see ports, and other NON-machined parts with powder coating on/in them, and the machined parts are clean? Because the powder coating is done before the machine work. :2thumbs:
It's always a gamble .... more have problems than those who don't.
John

seriously ? icons and a pic .... you seemed to be a know it all.... all I said was my powder coat on cylinders and heads were fine,,, maybe your powder coater doesnt know what heat to use....

 

[john sachs]

seriously ? icons and a pic .... you seemed to be a know it all.... all I said was my powder coat on cylinders and heads were fine,,, maybe your powder coater doesnt know what heat to use....

You're NOT reading or understanding my last sentence. I said "it's a gamble, more have problems, than those who don't."
I'm not a know it all by any means. I keep an open mind, and learn all the time.
John

 

[bigdogtech01]

I have always been told, a polished motor develops more heat than a non polished motor (because the polishing actually fills in any voids in the aluminum that would normally help with the cooling) Also a motor that has black powder coat runs cooler than one with no powder or gray powder. For whatever reason, an object painted in black (motor, furnace, radiator) dissipates heat better and in the case of a motor, will run cooler. That's why engine blocks are painted black from the factory. The only concern I would have with powder coating anything would be the heat factor (furnace temp is 425 deg F ) so would need to make sure all parts are able to hold up to that temp. Also, making sure the powder is not in ports, oil cavities or any other machined area.
Make sense?

 

[Utopiapga]

I have always been told, a polished motor develops more heat than a non polished motor (because the polishing actually fills in any voids in the aluminum that would normally help with the cooling) Also a motor that has black powder coat runs cooler than one with no powder or gray powder. For whatever reason, an object painted in black (motor, furnace, radiator) dissipates heat better and in the case of a motor, will run cooler. That's why engine blocks are painted black from the factory. The only concern I would have with powder coating anything would be the heat factor (furnace temp is 425 deg F ) so would need to make sure all parts are able to hold up to that temp. Also, making sure the powder is not in ports, oil cavities or any other machined area.
Make sense?

Makes sense to me right there............

 

[bearman]

Like Andrew said, polishing actually reduces total surface area and will inhibit heat dissipation.
Anything that absorbs heat faster or better, will radiate that heat back out faster when the external heat source is removed.
Any rough surface dissipates heat better than a shiny smooth surface. Flat black dissipates more heat than shiny black.
I think John is more worried about warping or disturbing the hardness of metals during the heating of the powder coating process. But I think he is also saying that if the powder coating is done first, then the machining is done, it will work better.

 

[BBChopper]

I have always been told, a polished motor develops more heat than a non polished motor (because the polishing actually fills in any voids in the aluminum that would normally help with the cooling) Also a motor that has black powder coat runs cooler than one with no powder or gray powder. For whatever reason, an object painted in black (motor, furnace, radiator) dissipates heat better and in the case of a motor, will run cooler. That's why engine blocks are painted black from the factory. The only concern I would have with powder coating anything would be the heat factor (furnace temp is 425 deg F ) so would need to make sure all parts are able to hold up to that temp. Also, making sure the powder is not in ports, oil cavities or any other machined area.
Make sense?

I was always told the same thing back in the day of running 2 strokers like RD350's and KH500 H1 tripples that flat black pulls the heat to the fins. My heads and jugs are getting powder coated flat black as we speak....

 

[bigdogtech01]

I was always told the same thing back in the day of running 2 strokers like RD350's and KH500 H1 tripples that flat black pulls the heat to the fins. My heads and jugs are getting powder coated flat black as we speak....

:2thumbs:That will look great...Post some pics after!! Yeah I would say what, 90% of all H-D's built have the black motors...? They are not melting down from heat. Even the H-D Police bikes that sit on the side of the road idling for several min keep going.

 

[FrankBDPS]

Rear fender Mods

This is the rear fender after a new license plate bracket and paint.The plate bracket has white led plate lights in the top,yellow turn signal led lights on the sides and red brake and running lights on the bottom.The paint is House of Kolors Kandy Apple Red over a Gold base.I am going to change it back to Brandywhine over gold like it was when I started.Thanks to Dennis at DZ Kustoms in Boardman,Ohio for the body work.Look up their web site.He builds some really cool bikes.