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marten.aap2.0

RC car liquid fuel engine dried up

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Posted · Original PosterOP

I'm working on an on RC car which runs on liquid fuel, but I ran into a problem: the fuel that was left in the engine block dried up completely.

Does anyone know how to get the fuel out of the engine? (without breaking it) Is there some liquid I can use to dissolve the fuel?

 

big think: the engine

small round thing: should go on top of engine

2 things on the left: heatsinks

IMG_20180818_151429630[1].jpg

IMG_20180818_151417186[1].jpg


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Doesn't rc cars use methanol, nitromethan and normal gas?

Pipe cleaner (mechanical cleaning) and ATA paired with ice  (if it does not damage anything) as a first step and after this try organic solvents. Water won't do it. Things like hexan might work.

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Posted · Original PosterOP
2 hours ago, James Evens said:

Doesn't rc cars use methanol, nitromethan and normal gas?

Pipe cleaner (mechanical cleaning) and ATA paired with ice  (if it does not damage anything) as a first step and after this try organic solvents. Water won't do it. Things like hexan might work.

someone gave me the advice to just bathe it in the fuel overnight, it has been in there for a few hours now. if that doesn't work, I'll try your methods. I'll keep you updated!


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Posted · Original PosterOP
48 minutes ago, r4tch3t said:

Soak it in isopropyl alcohol. Then wash it with hot water and soap.

Soaking it in fuel should also work. 

I tried bathing it in fuel last night, it has been in there for over 12hours. it kinda worked, a lot of the dry fuel dissolved, but not all.

Shall I put it back in the fuel for another 12hours or shall I try isopropyl alcohol?


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Posted · Original PosterOP
9 hours ago, Hackentosher said:

Try brake clean or alcohol. They are good at dissolving oils, grease and gunk. 

I took the engine out of the fuel and sprayed it with brake cleaner, I'll wait an hour and see if it worked.

 

 

 

Thanks for all the ideas!


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don't forget to quote or tag (@marten.aap2.0) me when you reply!

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what you have in there is most likely oil and not fuel because the fuel used for these cars would never dry up and leave a residue it would just evaporate off completely.

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Posted · Original PosterOP
1 minute ago, Pixel5 said:

what you have in there is most likely oil and not fuel because the fuel used for these cars would never dry up and leave a residue it would just evaporate off completely.

oh, well, in that case I change my question to "how on earth do I get that oil out of there"

The fuel kinda worked but it's slow, the fuel was transparent but after bathing the engine in there for 1.5 days it turned yellow and it has a lot of gunk floating around in it.

I'm now testing break cleaner, let's  hope that removes it quicker.


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it will certainly take some time but using solvents is simply all you can do to get the oil out.

 

when you reach a certain point you can also use oil to get it out because things like to dissolve in chemically identical things this could also work.

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On 19.8.2018 at 1:08 PM, marten.aap2.0 said:

Shall I put it back in the fuel for another 12hours or shall I try isopropyl alcohol?

Simular solve simular.

Let start by asking what is your fuel. Methanol, some longer hydrocarbon things (benzin/gas) and nitromethan and maybe FAME (not sure if this is also added to benzin)

Isopropanol is simular to methanol. So 12 hours methanol won't do it then 5min isopropanol won't do it.

What does this mean? you won't have anything left which would solve in this solution. There is a possibilty that your oil/fat resinify which should also lead to discoloration. 

 

Do you have solvents at home? Try small amounts of them since soking the part in it will result in a unnecessary high amount of waste.

Still the best way of cleaning something you have no clue of what it is and no sucess with previous trys is mechanical removal with a pipecleaner. 

 

Depending on which break cleaner you use you are now using short alkanes.

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