SOHC.co.uk Forums > CB750
Painting Crankcases
Trigger:
Welcome to the mad world of the SOHC, did see your 750 in the gallery, has a few wrong parts, should of asked on here before you took the plunge. The advise is free ;D ;D
Mr_Sheene:
Hello Trigger, I would have asked, if I had known the site existed at the time I was bidding. I'm from an earlier age. For example, my mobile is a phone! Also, as I said, it was a mistake to buy on e-bay, as there is a certain pressure not to lose the item. I believe that it's called 'auction fever' and I seem to have caught it on this occasion. I paid £5k for it and would have been happy if I could have simply ridden it. I am not looking for a concours winner or an auction champion, I just wanted a Sunday morning ride. If I can get the engine sorted, the rest of it is workable, although I will change the colour to the candy red alternative. I can't get original carbs as they appear to be unobtanium but I have got a decent set from a K1 to replace the set that are on it. All advice and observations are welcome. I'm too old to be 'proud'. The cylinder head seems to have a 'sand cast' finish. I don't have delusions of grandeur and know that this head was common but was it common to all CB750's. Some clot in the past has obviously tried to lever of the head and damaged a couple of fins but I put that down to patina as I don't have the missing bits to get it fixed. What is your opinion of 'ice blasting'?
Sgt.Pinback:
--- Quote from: mike the bike on November 20, 2017, 05:23:26 PM ---Never heard of ice blasting, I've just googled it. Most intriguing I must say.
--- End quote ---
You call it vapour blasting.
Works great.
Mr_Sheene:
I know marginally less than the square root of nothing about engineering but I love the internet. Vapour blasting, also known as wet blasting or liquid honing uses water and an abrasive medium blasted at the component. I think that these are very small glass or plastic beads. The water buffers and lubricates the particles on impact allowing fine finishes to be produced without damaging the component. I was going to use that until I was directed towards ‘Ice Blasting’, which uses dry ice that evaporates on contact taking the muck with it (it says in the blurb) and leaves no residue to block oil-ways etc. I was happy with that until I read Triggers entry about acid baths and ovens to get oil out of metal, so now I am doing more research. Thanks for the input though as it is the only way that the job will get done. My first entry asked if anyone knew of companies for cleaning and painting that can be recommended in south-east England. The request still stands, although if they are that rare I will consider going further afield.
Trigger:
--- Quote from: Sgt.Pinback on November 21, 2017, 03:04:55 PM ---
--- Quote from: mike the bike on November 20, 2017, 05:23:26 PM ---Never heard of ice blasting, I've just googled it. Most intriguing I must say.
--- End quote ---
You call it vapour blasting.
Works great.
--- End quote ---
Vapour blasting is glass bead and water ;) ice blasting is dried ice ;D
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