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Old 10-02-2019, 07:34 PM   #1
Arceenut
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Opinion re after run oil


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Hi guys
looking for your opinion on using Klotz super techniplate as a storage/after run oil. I believe the 'super ' has a percentage of castor does it not? Is the castor going to gum up over an extended (1-2 years in storage or is the percentage low enough to not matter?
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Old 10-02-2019, 07:48 PM   #2
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Re: Opinion re after run oil

Quote:
Originally Posted by Arceenut View Post
Hi guys
looking for your opinion on using Klotz super techniplate as a storage/after run oil. I believe the 'super ' has a percentage of castor does it not? Is the castor going to gum up over an extended (1-2 years in storage or is the percentage low enough to not matter?
Its 20% castor.

Id try it out. Im still using some bottles of Prather and Hobbico after run oil I had bought years ago. I have some Klotz all synthetic Im going to use after my bottles of after run oil are eventually done. However, Ive used other oils through the years without issue. Better some oil than none.
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Old 10-02-2019, 10:31 PM   #3
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Re: Opinion re after run oil

I use ATF straight up.
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Old 10-03-2019, 01:48 AM   #4
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Re: Opinion re after run oil

Yes,ATF oil works great but the best start to a rust free engine is pull the carb fuel line and fire up the engine until it won’t run. It’s the alcohol , absorbing moisture in the air and then
The alcohol evaporates over time Leaving water that causes the problems with rust. The ATF is an added help.
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Old 10-03-2019, 07:06 AM   #5
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Re: Opinion re after run oil

I have mentioned this before, but since the mid 80's made my own assembly and after run oil from a 50/50 mix of ATF and air tool oil. Either would likely work fine alone without damaging seals or O-rings, I just did it that way since had both available at the time.

Along with protecting internals, another key to long term storage is to prevent atmospheric moisture from getting in. With spares engines I seal them in thick freezer bags. Mounted engines get at least their exhausts plugged when not running, although to be honest 4-strokes are almost impossible except for closing the throttle, especially if cowled.

Pic shows a 2-stroke with both the intake and exhaust plugged, something I tried to do after every flying session.

Methanol is not directly the problem, although from memory it is an open ended molecule that will bond with water, (why it is used as gas line anti freeze). It is when that water mixes with any remaining nitro a corrosive forms that goes after ferrous bits almost immediately.
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Old 10-03-2019, 08:17 PM   #6
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Re: Opinion re after run oil

Then your last run should be with FAI fuel. Not?

Hard to justify buying a special jug of fuel just for one short run a year though!
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Old 10-05-2019, 02:43 PM   #7
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Re: Opinion re after run oil

I've always just used dexron 3 automatic transmission fluid. Just dont use after run oils in YS engines. Anything petroleum based will damage the diaphragm in the pump.
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Old 10-05-2019, 04:20 PM   #8
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Re: Opinion re after run oil

Quote:
Originally Posted by Arceenut View Post
Hi guys
looking for your opinion on using Klotz super techniplate as a storage/after run oil. I believe the 'super ' has a percentage of castor does it not? Is the castor going to gum up over an extended (1-2 years in storage or is the percentage low enough to not matter?
The castor oil will not gum up. If it is run only then will the the castor get real sticky. I use the castor for engines I collect and that don't get run, it works fine. As Andrew says, better some oil than nothing at all.
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