Re: Getting Ready to Attempt some Restorations - Newbie

**Cribbs74** Wed Jan 20, 2021 6:14 pm

gkamysz wrote:
Cribbs74 wrote:Umm no, colored cases are dyed and anodized. Plain cases aren’t dyed, just anodized. Other than color the anodizing process is the same.

I'm familiar with anodize. If you do a conductivity test, you'll find natural cases are conductive and colored cases are not. Natural cases also scratch much more easily compared to colored cases. I don't see any evidence natural cases are anodized. The conductivity is the most telling. I could be convinced that they were conversion coated which would also prevent corrosion, is conductive, and fast(cheap).

It took me a while to finish my post so I didn't see the post above.

Yeah I did some research to check my memory and since I was glaringly wrong I removed the post so that info wasn’t floating around leading folks astray.

Oldenginerod Wed Jan 20, 2021 7:19 pm

I have no evidence to back it up, but I am 100% certain that I have read that the plain uncoloured Cox engines are anodised. I'm not going to debate it, but I believe the evidence is clear that the surface is hardened, having first-hand experience in polishing cases and tanks only to find that they then tarnish and mark far more easily than prior to polishing. I can't imagine Cox anodising black and gold cases, which would harden the bearing surface, and not treating the uncoloured cases in the same way to maintain consistent durability.

**Cribbs74** Wed Jan 20, 2021 10:15 pm

That was my thoughts exactly Rod. Why have some engines last longer than others. Seems like poor quality control. I can’t dispute Larry Renger and Mudhen. Both worked at the Cox factory. I thought I had read somewhere that all cases were anodized, which would make total sense, but apparently they stopped doing it in the 60’s.

Who knows, I suppose you could say who cares.... lol!

I still wouldn’t polish a case.

Oldenginerod Thu Jan 21, 2021 12:34 am

Cribbs74 wrote:

I still wouldn’t polish a case.

Guilty as charged. They do come up looking nice with a decent shine-up. I certainly wouldn't alter a bearing surface by polishing. I'd just do the external "bling". I use a stitched rag buff on my bench grinder, along with Josco brown polishing compound for Brass, Copper, Aluminium. Babe Bee tanks come up particularly nice. You need to hold on tight, or your freshly polished piece can get slammed on the floor or wall if the buff grabs.

Levent Suberk Thu Jan 21, 2021 2:12 am

Cribbs74 wrote:That was my thoughts exactly Rod. Why have some engines last longer than others. Seems like poor quality control. I can’t dispute Larry Renger and Mudhen. Both worked at the Cox factory. I thought I had read somewhere that all cases were anodized, which would make total sense, but apparently they stopped doing it in the 60’s.

Who knows, I suppose you could say who cares....

I still wouldn’t polish a case.

Ron, you are right with early made engines. They were clear anodized:

https://www.secret-bases.co.uk/wiki/Cox_model_engine

Getting Ready to Attempt some Restorations - Newbie - Page 4 Screen75

Getting Ready to Attempt some Restorations - Newbie - Page 4 Screen74

getback Thu Jan 21, 2021 8:45 am

Bretherman , i know your new here but to let you know there is NO disrespect to the thread going off topic , it happens ALOT around here lol!

**Cribbs74** Thu Jan 21, 2021 10:25 am

Sorry! yeah sometimes it does.

**Cribbs74** Thu Jan 21, 2021 11:29 am

Oldenginerod wrote:
Cribbs74 wrote:

I still wouldn’t polish a case.

Guilty as charged. They do come up looking nice with a decent shine-up. I certainly wouldn't alter a bearing surface by polishing. I'd just do the external "bling". I use a stitched rag buff on my bench grinder, along with Josco brown polishing compound for Brass, Copper, Aluminium. Babe Bee tanks come up particularly nice. You need to hold on tight, or your freshly polished piece can get slammed on the floor or wall if the buff grabs.

I should have worded that better, I mean’t I wouldn’t polish the bearing surface within the case. Anodized or not.

davidll1984 Thu Jan 21, 2021 8:02 pm

Ok y have Somting To say here From what I have learned with the multiple tests it is better lapp the crank inside its crankcase if its nead Most custom engine modified do that and kustom kraftmanship Don't hesitate to explain clearly why he is doing it its wy som engines perfome Extremely good an guy using them win

davidll1984 Thu Jan 21, 2021 9:50 pm

Here is a good subject for the demonstration of a new chaf crank with slight rust after night in parler towel wit wd40 This is how I remove rusty use the javel water wit water let the parts in that stuf for like 15 min