daveh74

May sound like a sad question BUT what is the best colour for an inlet manifold to be coloured to avoid heatsoak?

It will be powdercoated not painted

thanks Dave

Midlife......

iTrader: (2)

the best colour would be a reflective surface (foil) or failing that white. On the premise that both these colours would reflect radiant heat rather than absorb them as a dark colour (black) would.

However I'd think that most heat would be transfered by conduction from hot air then the colour wouldn't make much difference.

Best bet would be a silver reflective finish with an inner skin with a vacuum between like a thermos flask LOL

Shaun

swisstonihasher

You'll get most transfer from the block itself, best go for tufnol spacers or water injection - that will keep the inlet cool for sure!

Shmerman

iTrader: (14)

Yep, as swisstoni ssays most of the heat is transferred from the block and header tank. Best bet is to get some unsulators from leteral or Carl Davey, specialist Subaru Impreza parts supply

Ian

iTrader: (10)

would it make any difference on what the colour is? as when the bonnet is closed, it will be in the dard anyway.

i know white reflects sun light, and back draws in it, but and night, do they make any difference?

swisstonihasher

Yes m8 it does, light makes no odds, its heat - white reflects heat engery from the sun.

hmhaga

WHITE is neither the right answer nor the right colour
BLACK is the colour that radiates most heat from a surface.

Midlife......

iTrader: (2)

hmhaga

You are thinking about "black body radiation"......Planck / einstein and all that LOL

A black body absorbs more radiant heat than a white body. Its why sailors wear "tropical whites" in hot weather.

Shaun

jimes

think back to air cooled 2 strokes......the heads and pipes etc were black and there was even high temp paint called pot..........black!