After Run Oil

[Jzen]

This may be a dumb question but, where do I put the after run oil? Do I take out the glow plug and put some drops on the piston and turn the flywheel a few times or take off the air filter and put some in the carb? And should I do this while the engine is still hot? I'm a newb :spit: Thanks

 

[beason]

some people do both (best) the idea is to coat the whole inside of the motor with the oil so it doesn't rust.. and yes you can do it hot..

 

[RatzoRC]

Just a few drops though.
Don't get crazy.

 

[NITEMARE]

I do both.

 

[smokin al]

I get a little queezy when I take out my plug so many times. Scared of screwin' up the threads. Also, I have felt some dirt get in the threads as well. I just put 3-4 drops in the carb and pull it over a few times. My 2 cents.

 

[rocknbil]

Well there are other reasons not to, too.

Every time you remove the plug and re-torque it, it scratches and distorts the copper gasket. Eventually this can lead to compression loss. Additionally when you go squirting oil into the hole you open the possibility of getting dirt and dust in there. You just don't need to remove the glow plug to apply after run oil.

The idea with after run oil is as beason said: the alcohol in your fuel condenses water from the air and if you don't treat your engine after a run, this can cause rust spots to form on your engine internals. The idea is to completely flush out the remaining fuel in your engine and replace it with a good water-displacing oil. I use a 50/50 mix of Marvel Mystery Oil and full-scale ATF (Automatic Transmission Fluid.) Some even use WD-40, because it is inherently a water displacing oil and have "never had a problem." Well, WD-40 has solvents and acids in it, and even though Traxxas recommends it, I don't want solvents and acids in my engine. (This is a personal preference.)

For after run oil treatments, I put it down the air inlet only, and refer to the way they describe it on the OS Engines site:

When you use after-run oil, 2-5 drops are next to useless. You'll need to literally flood the engine with oil, so much so that the next time you start the engine, it will be difficult. We use at least a 1/2 teaspoon of oil, and sometimes more. A 3 oz. bottle of oil lasts about a dozen flying sessions.

Although quoted in context to airplane engines, the concept is the same, if you don't completely displace the fuel deposits, it's as good as not using anything at all.

If you use half a teaspoon and crank the engine over a few times (or a good burp on the starter box) the oil will find its way into the combustion chamber just like the fuel does, through the intake ports of the sleeve. So you don't need to remove the plug. Besides, anything you pour down the glow plug hole will blow right out the exhaust port as soon as you crank it over.

Also it's important to remember after run oil is a long term storage treatment, long term being a week or more. If you run your nitro every day, you don't need to use it. At all. The problem is, we never know when we'll be able to run next, so we do it every time just in case. It certainly doesn't hurt.

 

[Jzen]

Great advice rocknbil. Thanks

 

[Bouzouki]

I use it.


Don't need it though, I can leave my engine flooded with O'donnel and it still wont rust.

 

[redhatman]

i just take off the air filter, stick about 3 drops in the carbeuator with it in WOT, so it goes down the hole. Then I turn the engine over about 5 pulls.

 

[nitrost]

o donell fuel reccomends not to use it. and i dont never have because none of my engines ever done anything except for when i store them for ever

 

[Diver6127]

I use it.


Don't need it though, I can leave my engine flooded with O'donnel and it still wont rust.

It's not just the rust you're fighting. Fuel, even mixed, will gel as well as break down from absorbing moisture.

 

[bustedgears]

I after-run mine, and clean them thoroughly before I store them. sometimes i'll go a month without driving. I'll be putting them on the back burner while I'm in school. Weekends, they'll come out.

Like rocknbill said, It doesn't do any good to put it inside teh glow plug hole.

What I do every once in a while is put some ARO inside the carb hole and start it with no fuel, only ARO. It will run for just a second and die. Then I squirt a pretty good bit inside the carb and turn it over without the ignitor. It's a little hard on the plug, but it almost guarantees removal of all moisture.

 

[Pinblaster]

I use Marvel Mystry oil only. Pull the air filter, squirt a bit in the carb, turn it over a few seconds. For long term storage, I put in an old glow plug, and load the engine up with MM oil to flush every thing out.

FYI: you can buy a quart of MM oil for about the same price of 1 ounce of after run oil from your LHS. No need to mix it with Trany fluid either.