Anodising, cooling effect?

[50gary]

I visit a motorcycle board and one of the common questions is, "will powder coating hinder my engine cooling?'' I suggest to anodize the cylinder barrels on an aircooled engine to get the desired look but not the retained heat. Does anodizing help or hinder aircooled motorcycle engines?
Cheers, 50gary

[rclint]

Originally Posted by 50gary

I visit a motorcycle board and one of the common questions is, "will powder coating hinder my engine cooling?'' I suggest to anodize the cylinder barrels on an aircooled engine to get the desired look but not the retained heat. Does anodizing help or hinder aircooled motorcycle engines?
Cheers, 50gary

This does not line up just right, will see if I can fix infrared radiation reflectivity (emissivity) of some common materials:, maybe thsi will help you


Material Reflectivity
Aluminum Bright 90-95%
Anodized 45%
Oxidized 70-80%
Brass Bright 97%
Oxidized 39%
Chromium Polished 92%
Copper Bright 95%
Oxidized 22%
Steel Polished 45%
Oxidized 15%
Nickel Polished 95%
Oxidized 5%
Zinc Bright 77%
Oxidized 77%
Paint White 10%
Black 14%
Rubber 6%
Water 8%

[sswee]

Almost all coatings effect cooling but most do not hinder heat dissipation to a large degree. Since the early days of motorcycles, the aluminum parts have been coated to protect against oxidation. The manufacturers PC or clear coat engine parts so it can't be too detrimental. The one problem with anodizing those parts is the majority of them are cast aluminum, which can be very difficult if not next to impossible to anodize due to their material makeup. SS