should or should afterrun oil mix with the fuel?  
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> RC Fuels >> should or should afterrun oil mix with the fuel?
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should or should afterrun oil mix with the fuel? - 2/20/2008 8:16:07 PM   
Austis


 

Posts: 160
Joined: 10/2/2005
From: , ,
Status: offline 		I just wondered.
should the afterrunoil mix with fuel or not?
If you put some of the fuel you use in a cup, and pour some afterrun oil in it. should it mix or should the oil just lay like a little "bubble" in it?
cause when you arive at the airfield, and your engine is filled with afterrun oil, and you tank up with fuel and start I wonder if it would be any ill effect if it do not mix, or will it just "swosh" it out and in a few seconds its only pure fuel that goes through like when it was new?

And when I pour it into the engine, after end flyingday, will the oil then squise the fuel out of the bearings and stuff and lay and protect(but in this case where do the rests of the fuel left in it go then?it still have to be in the engine somewhere.)

Cause yes, I tried out of curiosity just with a cup of fuel, and poured in some of my afterrunoil.
It didnt mix, it layed in a little "bobble" in the middle. when I stirred it, it just separated into lots of smaller bubbles.
Do anyone actually know the answer to this?
is it best that it does mix, or shal it not mix to take care of my engines?

Try with your own fuels and afterrunoils and tell if yours mix or not!

< Message edited by Austis -- 2/20/2008 8:19:43 PM >
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RE: should or should afterrun oil mix with the fuel? - 2/20/2008 9:57:23 PM   
XJet


 

Posts: 2984
Joined: 3/31/2003
From: Tokoroa, NEW ZEALAND
Status: offline 		I don't think it's important that the ARO mixes with your fuel.

The reason we use ARO is often because the oils in our fuel are non-polar and therefore don't "wet" the metal parts of our engines particularly well. These oils are also relatively hygroscopic and thus can contain water (as a combustion byproduct or simply absorbed from the air) -- so the idea is to use an ARO that will *displace* the nasty contaminated oil and combustion residues.

I tend to use Mobil 1 synthetic which definitely doesn't mix with glow-fuel or existing methanol-soluble oils and it's worked extremely well when I've felt the need to use it.

However, I find that even a tiny amount of castor oil in my fuel provides all the after-run protection I need and only bother with ARO if I plan to store an engine for more than 2-3 months.

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(in reply to Austis)
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RE: should or should afterrun oil mix with the fuel? - 2/22/2008 6:28:12 PM   
Austis


 

Posts: 160
Joined: 10/2/2005
From: , ,
Status: offline 		But if it not mixes, when you pour in into the engine, where do the small leftover of fuel go then, cause it has to be in it somewhere. how to be sure that the fuel then is not liing anyplace where it can du any harm?

and when I start up the engine, will it be any difficulties if when there is oil in there that do not mix with the fuel?
I mean how long is the rests of the aro in my engine when I tank up and start the engine? do it get swoshed out whit the fuel in short time(copple of seconds) and then the engine runs like it should do afterwords or is there anything I should do.

this is when the engine has been stored for a while and been filled with aro to protect it.

any suggestions on this or is it just notting to think of (that it will work like it shold be and I will not notice any difference in performance with aro that do not mix or without?)

(in reply to XJet)
       Post #: 3

RE: should or should afterrun oil mix with the fuel? - 2/22/2008 7:45:52 PM   
carrellh



Posts: 3123
Joined: 3/30/2003
From: Garland, TX, USA
Status: online 		If it has actually been "filled" with any kind of oil you should try to get most of it out before starting the engine. If you have an electric starter you can remove the glow plug and give the engine a good spin. Be sure to put a towel (or something) over the glow plug hole to prevent a giant mess.

If the amount used was just a spoon full just start the engine as normal and it will be blown out the exhaust (or crankcase breather tube on a four stroke) in a few seconds. The engine sometimes will run badly until all of the oil is blown out. You might need to rev it up pretty good once before removing the power from the glow plug.

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Carrell

(in reply to Austis)
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RE: should or should afterrun oil mix with the fuel? - 2/22/2008 10:00:55 PM   
Austis


 

Posts: 160
Joined: 10/2/2005
From: , ,
Status: offline 		ok... but then it seems to me that if the aro dont mix with my fuel, dont have anything to say for either preservation when stored, or for use afterwards(exept that the engine has to be revved up in rpm to blow the aro out before the first flight.)?

(in reply to carrellh)
       Post #: 5

RE: should or should afterrun oil mix with the fuel? - 2/23/2008 1:34:19 AM   
Alex570


 

Posts: 71
Joined: 3/31/2006
From: West Sunbury, PA, USA
Status: offline 		You don't mix after run oil with your fuel. When you are done flying you put a couple drops in the carb and turn over the motor.

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what?

(in reply to Austis)
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RE: should or should afterrun oil mix with the fuel? - 2/23/2008 2:56:40 AM   
downunder



Posts: 3007
Joined: 10/10/2002
From: Adelaide, AUSTRALIA
Status: offline 		That's one of the advantages of having some castor in the fuel. It's not only a great lubricant but it's also polarised which is what any ARO needs to be. Polarised simply means the oil molecules act like a magnet so they're attracted to metal (particularly iron) while unpolarised oil (most synthetics) act a bit like a magnet trying to pick up a bit of aluminium. It just falls off .

(in reply to Alex570)
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RE: should or should afterrun oil mix with the fuel? - 2/23/2008 3:08:45 AM   
carrellh



Posts: 3123
Joined: 3/30/2003
From: Garland, TX, USA
Status: online 		I never knew if it mixed or not, and I do not use it. I guess I think; if there is more ARO in the engine than fuel residue, the ARO should get on everything it needs to get on.

In the OS engine forum, Bax says to use a liberal amount; a few drops is not enough according to him.

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Regards,
Carrell

(in reply to Austis)
       Post #: 8

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