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Post  Scotland421 Thu Jun 24, 2021 8:52 am

Does anyone know if Sig castor has detergents in it? I have an OS .20 (Max), I have been usin' my home brew zero nitro fuel (22% Sig castor.) This engine has 1.5 hours on it so far since fresh outae the box. The piston is still as shiny as it was when new. Most iron piston engines I have , the piston went brown with this much run time, this one tae no avail....Any thoughts?
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Post  Marleysky Thu Jun 24, 2021 10:34 am

@Scotland421 wrote:Does anyone know if Sig castor has detergents in it? I have an OS .20 (Max), I have been usin' my home brew zero nitro fuel (22% Sig castor.) This engine has 1.5 hours on it so far since fresh outae the box. The piston is still as shiny as it was when new. Most iron piston engines I have , the piston went brown with this much run time, this one tae no avail....Any thoughts?

Yeah, my though is Sig castor is exactly that: castor. I do not believe they would need to put anything else in it. You may want to add some Klotz as an additive for additional lube protection, but I don’t recall OS requiring it.
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Post  Marleysky Thu Jun 24, 2021 10:47 am

You didn’t say what %Nitro your homebrew consisted of. OS doesn’t require a very high nitro content with out proper run in. Your running enough castor oil per these instructions.
Sig castor E857ae10
Sig castor D1382010
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Post  Scotland421 Thu Jun 24, 2021 10:50 am

@Scotland421 wrote:Does anyone know if Sig castor has detergents in it? I have an OS .20 (Max), I have been usin' my home brew zero nitro (22% Sig castor.) This engine has 1.5 hours on it so far since fresh outae the box. The piston is still as shiny as it was when new. Most iron piston engines I have , the piston went brown with this much run time, this one tae no avail....Any thoughts?
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Post  Scotland421 Thu Jun 24, 2021 10:54 am

The instructions ye show are fae the LA series engine (aluminum piston in a nickel plated brass liner), Mine is an OS Max .20 frae 1969 (iron piston)
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Post  Marleysky Thu Jun 24, 2021 11:41 am

@Scotland421 wrote:The instructions ye show are fae the LA series engine (aluminum piston in a nickel plated brass liner), Mine is an OS Max .20 frae 1969 (iron piston)

Sometimes I just don’t comprehend what I have just read....skipped right over the “zero nitro”.!
Couldn’t find any manuals in the discontinued engines on the 20 max on the OS web pages, but peter chinn did a nice test write-up on the sceptre website.

http://sceptreflight.com/Model%20Engine%20Tests/OS%20Max%2020.html

That’s all the free information I have for today...
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Post  Scotland421 Thu Jun 24, 2021 11:50 am

I have the manual, it was a new in box engine I've had fae 45 years
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Post  Ken Cook Thu Jun 24, 2021 2:53 pm

Sig castor oil is listed as Bakers grade AA which means it's the first press when produced. The oil is also lighter in color compared to most castor oils. If you were using other types of castor oil prior, they may not be as refined, thus the brownish carbon deposits you have noted. Using Sig, you will also achieve that same patina eventually.
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Post  gkamysz Thu Jun 24, 2021 3:19 pm

Years ago, Klotz told me they supply Sig castor. It would be no surprise if was not neat castor.
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Post  getback Fri Jun 25, 2021 8:09 am

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Post  davidll1984 Fri Jun 25, 2021 11:00 am

I have read this post a little but I don't think I read that resin seed is a very potent poison and therefore using pharmaceuticals may seem safer. I believe the extracted oil is safe for the most part But good me as long as it lubricates properly Huh... I don't really see an alternative Synthetic oils are not heavy enough I too have trouble finding pure castor oil Also the 30% nitro very difficult Recently Sad DAMMIT!
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