SOHC.co.uk Forums > CB350/400
Engine cleaning/ degreasing question
beemsquar:
As far as I'm aware, (my dad's a powdercoat and stove enamel specialist), powder coating the engine block is fine as long as it's been sufficiently cleaned and prepared.
He said to me that the biggest problem is the quality of the aluminium being full of impurities in the casting process and out gassing, which causes gas, and oil on used machines, to rise to the surface and stop the powder adhering to the metal. Not a problem on high grade aluminium or billet.
He has powdercoated hundreds of bikes and always warns his clients and me that it could be a possibility and that wet paint is an option.
The process I think they use is clean the engine, soda blast engine, clean again, heat in the oven to get oils to rise out of pores, place into a phoswash machine, which is like a giant cleaning and degreasing dishwasher that puts a phosphate coating to stop corrosion, then it's put in the oven to dry before being powdercoated and cured.
A long process, but seems to give the most consistent results.
I was going to restore my bike back to original , but it is in a bad way, missing A LOT of parts and so I think it's not economical for me to restore to original spec, hence powdercoating and modifying it instead.
I'm going for a textured dark grey/black block with a special satin black on the covers, hubs. Wheels and frame.
royhall:
Neither of my 2 powder coaters would do the head or barrels due to the heat rating of the powder? Don't know much about it but apparently there's a high temperature nylon powder for that. Had the rocker box and side casings done on the 750F2 and there are minor bobbles on it already. Would love to see a powder coated engine though as it saves a lot of work painting.
Sent from my GT-I9305 using Tapatalk
beemsquar:
I agree, my dad said the same thing. The casings and head etc are being painted in a high temp satin black paint for that very reason.
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