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Post  robot797 Wed Sep 28, 2016 11:30 am

hi
after a recent topic that was about the mk17
i wanted to start a topic with a few questions about the oil we use

i have used castor oil and extra virgin olive oil
as far as my research has shown they are both the same

but (there is always a but)
there is one problem with olive oil
that everybody talks about
if you get normal olive oil it damages the engine becaus it burns

i have run my mk17 on a fuel that has olive oil
and i have not seen any signs of wear or damage

the oil out of the engine still has the color of the extra virgin olive oil
but it does not smell like it anymore

my generator also runs it and that one runs a lot hotter
and the oil does the same in that engine

are there people here that have tried
extra virgin olive oil
or is it just me and a couple other guys on the other forums

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Post  Cribbs74 Wed Sep 28, 2016 2:47 pm

Well I learned two things today, why we use castor in model engines and never type "Olive oil as a lubricant" in the search engine.

Long story short, while Olive oil has similar properties and in some cases a higher smoking point such as (extra virgin) it does not polymerise and create varnish when overheated like Castor oil does. Basically it won't protect your engine when it goes too lean. I think the success people have had is because they are operating the engine in a safe temp zone. If something goes wrong it wil melt an engine in short order.

It would be safer in RC as you can kill the engine in flight. In Control Line if it goes lean you have to ride it out.

I personally wouldn't bother with it. It is good on Salad and Bread though!


Last edited by Cribbs74 on Wed Sep 28, 2016 2:50 pm; edited 1 time in total
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Post  robot797 Wed Sep 28, 2016 2:49 pm

the reason why i tested it as a castor replacement
becaus cator is rediculus expencive here
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Post  Cribbs74 Wed Sep 28, 2016 2:53 pm

Yeah I get that, what I was saying is it's only safe when everything is perfect. Do you have no way of obtaining properly mixed fuel?
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Post  RknRusty Wed Sep 28, 2016 2:55 pm

Ahh, shoot, I took too long to send.
Since I don't know all that much about oils, a complex subject no matter what the organic or synthetic origin, I'll post a link to a list of vegetable oil smoke points. I fried flounder for supper last night in canola oil(400F), a.k.a. Canada oil, or GMO'd rapeseed. It does not address viscosity, film strength, varnish, or any mechanical properties or values, just cooking implications.

https://jonbarron.org/diet-and-nutrition/healthiest-cooking-oil-chart-smoke-points

Let the discussion begin.
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Post  robot797 Wed Sep 28, 2016 3:01 pm

Cribbs74 wrote:Yeah I get that, what I was saying is it's only safe when everything is perfect. Do you have no way of obtaining properly mixed fuel?

no here in holland we never realy used diesels
so i have to mix my own
the funny thing
parafin/kerosine dirt cheap
ether kind of okey (just found a store that sells it in 5 liter jugs)
castor oil 120 ml 3 euro expencive stuff
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Post  ian1954 Wed Sep 28, 2016 3:13 pm

Try doing a search for "Racing Castor Oil"

e,g,

https://www.bloodsweatgears.com/product/maxima-castor-927-2-stroke-premix-racing-oil-1ltr/?gclid=Cj0KEQjw1K2_BRC0s6jtgJzB-aMBEiQA-WzDMS9WhdUwPD_zrttJ5ulMoFSOEqkZ77eIyjO0LBtz1rEaAupB8P8HAQ

or "Pure refined castor oil"

Preferably first pressing.


Do not use medicinal castor oil!
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Post  robot797 Wed Sep 28, 2016 3:19 pm

pure refind costs 13 euro per 300 ml
racing oil is only sold by one company and it is around 10 euro and 10 euro shipping
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Post  gcb Wed Sep 28, 2016 11:15 pm

robot797 wrote:pure refind costs 13 euro per 300 ml
racing oil is only sold by one company and it is around 10 euro and 10 euro shipping


How much do your engines cost?

Experienced people here are suggesting castor oil.

AFAIK ALL diesel engine manufacturers recommend castor oil.

If you intend to run the olive oil, keep your compression settings on the low end...that is, when you peak it out there is a flat spot where increasing compression does not increase RPM. Exceeding that compression causes RPM to drop off. At that point lower compression until it starts to lose RPM. Raise compression just a bit to peak.

Good luck either way but I would suggest you find a source of commercial blend that uses castor.

As someone mentioned, olive oil is good for salads and bread. If it were good for engines, more people would use it...including me.

George
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