andy m Posted February 2, 2012 Report Share Posted February 2, 2012 What is the general consensus re heat dissipation. I am building a B175 engine for trials, I am using a modified Fantic 200 cyl head which has a larger finned area etc, they can get hot during trials in the warm months and they are centre plug head. On the Fantic they were black, just wondering is it best to paint or get blasted to bare ally. ?? I will be painting the barrel and using a Suzuki TS185 piston. Thanks in advance.... Quote Link to comment Share on other sites More sharing options...
paul w Posted February 2, 2012 Report Share Posted February 2, 2012 Black Quote Link to comment Share on other sites More sharing options...
gii Posted February 2, 2012 Report Share Posted February 2, 2012 Best though, do both Get it blasted back to bare aluminium, then immediately paint it black before oxides get in the way Quote Link to comment Share on other sites More sharing options...
tankygsy Posted February 2, 2012 Report Share Posted February 2, 2012 Have it flame sprayed with a thermal coating... Quote Link to comment Share on other sites More sharing options...
dadof2 Posted February 3, 2012 Report Share Posted February 3, 2012 A freshly sand blasted surface gives the best heat dissipation. However this declines as aluminium oxide (anexcellent insulator) forms. Therefore for best long term dissipation a matt black paint is best. I wonder what they (manufacturers) use to control / prevent oxide build up on the currently popular unpainted aluminium radiators? although maybe it is not such a problem as radiators never get anywhere near as hot as air cooled cylinder heads. Cheers Quote Link to comment Share on other sites More sharing options...
charlie prescott Posted February 3, 2012 Report Share Posted February 3, 2012 Hi Guy's. Hi Andy. Give Porl Joynes, at Redditch Shot Blasting a ring. Regards Charlie. Quote Link to comment Share on other sites More sharing options...
rodt Posted February 3, 2012 Report Share Posted February 3, 2012 (edited) Do you have a nice alloy barrel as well, Andy or the cast iron original ? Edited February 3, 2012 by RodT Quote Link to comment Share on other sites More sharing options...
andy m Posted February 3, 2012 Author Report Share Posted February 3, 2012 Do you have a nice alloy barrel as well, Andy or the cast iron original ? Original... will be black... Quote Link to comment Share on other sites More sharing options...
jon v8 Posted February 3, 2012 Report Share Posted February 3, 2012 (edited) This is what yer need - http://www.youtube.com/watch?v=9Egt1Hq4wpE See you at Telford. Edited February 3, 2012 by jon v8 Quote Link to comment Share on other sites More sharing options...
andy m Posted February 3, 2012 Author Report Share Posted February 3, 2012 Before my time Jon...... See you there, bring loads of money.. Quote Link to comment Share on other sites More sharing options...
copemech Posted February 4, 2012 Report Share Posted February 4, 2012 I seem to recall official testing on this subject done " back in the day" which revealed little to no real difference in heat dissapation. I doubt excess paint is good, yet the oxidation of bare metal is not either. If old paint were thick, I would strip and re-apply! Quote Link to comment Share on other sites More sharing options...
jse Posted February 4, 2012 Report Share Posted February 4, 2012 I seem to recall official testing on this subject done " back in the day" which revealed little to no real difference in heat dissapation. I doubt excess paint is good, yet the oxidation of bare metal is not either. If old paint were thick, I would strip and re-apply! Years ago we did dyno testing of coatings and found a flat black finish gave about a 15% reduction in internal heat. To reflect external heat source, a light color, like white, worked well. Jon Quote Link to comment Share on other sites More sharing options...
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