RC Fuels Nitromethane, Castor Oil, Synthetic, heli fuel, 4 stroke, etc...Fuel Q&A is here!

How to keep castor from seperating in cold?

Reply
Old 01-16-2012, 07:21 AM
  #1
Max_Power
Thread Starter
 
Max_Power's Avatar
 
Join Date: May 2005
Location: Savage, MN
Posts: 567
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default How to keep castor from seperating in cold?

Ok, I have some high nitro fuel I mixed for my small 1/2a engines for when I want them REALLY HOT . I had a jug of powermaster 50/50 methanol/nitromethane like they used to sell. I combined 8/10 of a gallon of this to 2/10 of a gallon of sig castor. I figure I should be pretty close to 40% nitro and 20% castor fuel mix.

Here in Minnesota when it is cold the oil seperates and rises to the top. I have read that with high nitro percentages the oil will seperate like this and unless you want to be constantly mixing it needs a "co-solvent" How normal is my situation and what can be done about it? What is a good co-solvent? I'd like to make this work as it will be all the high% fuel I will need for life running small engines! Thanks in advance.
Max_Power is offline  
Reply With Quote
Old 01-16-2012, 09:08 AM
  #2
gkamysz
 
gkamysz's Avatar
 
Join Date: Jun 2003
Location: Crystal Lake, IL
Posts: 3,397
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: How to keep castor from seperating in cold?

Typically the answer is synthetic oil.

How long has your castor been sitting around? I've had problems with old castor.
gkamysz is offline  
Reply With Quote
Old 01-16-2012, 11:00 AM
  #3
pe reivers
 
Join Date: Jan 2002
Location: Arcen, , NETHERLANDS
Posts: 6,571
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: How to keep castor from seperating in cold?

Add some acetone. This helps as solving agent. Keeping the fuel above freezing when not in use also helps.
pe reivers is offline  
Reply With Quote
Old 01-16-2012, 05:13 PM
  #4
downunder
 
downunder's Avatar
 
Join Date: Oct 2002
Location: Adelaide, AUSTRALIA
Posts: 4,509
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: How to keep castor from seperating in cold?

I suspect your fuel is hovering right on the edge where castor is no longer soluble in nitro and I'm guessing this "edge" may be temperature dependent in that with warmer fuel the oil may not seperate out. Try what pe said or you could try ether which is a very good solvent but tends to evaporate out rather quickly. Or just fly on warmer days .
downunder is online now  
Reply With Quote
Old 01-16-2012, 08:19 PM
  #5
Max_Power
Thread Starter
 
Max_Power's Avatar
 
Join Date: May 2005
Location: Savage, MN
Posts: 567
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: How to keep castor from seperating in cold?

How much acetone are we talking PE? 1 or 2%?....I did move it into the house out of the cold garage and it seems to be better. I don't use it very often but like to keep it as a "stash" of the stout stuff. The castor is about 2 years old, as is the nitro/methanol. Thanks for the replies...I think I may try some acetone.
Max_Power is offline  
Reply With Quote
Old 01-17-2012, 03:47 AM
  #6
pe reivers
 
Join Date: Jan 2002
Location: Arcen, , NETHERLANDS
Posts: 6,571
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: How to keep castor from seperating in cold?

The norm is about 3%. More will harden your silicone fuel lines too much.
Because Acetone evaporates better than methanol at low temperatures, it also improves winter wonderland engine handling, especially the cold starts.

PS
Ether in glow fuel causes knock, unless your compression ratio is very low. Not good either way.
pe reivers is offline  
Reply With Quote
Old 02-11-2012, 08:01 AM
  #7
aspeed
 
aspeed's Avatar
 
Join Date: Jul 2011
Location: Ruthven, ON, CANADA
Posts: 2,841
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: How to keep castor from seperating in cold?

I heard a detergent mixes oil and water in high school chemistry.  I am not sure I would put it in glow fuel with a motor I care about though.  Most of them are water based.  Might be an experiment if you have nothing to do.  It may foam up too much or take too much to have an effect. ( I failed grade 12 chemistry too if you really want to know.)
aspeed is offline  
Reply With Quote
Old 02-11-2012, 08:09 AM
  #8
Sport_Pilot
 
Sport_Pilot's Avatar
 
Join Date: Jan 2002
Location: Acworth, GA
Posts: 16,889
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: How to keep castor from seperating in cold?


Quote:
ORIGINAL: aspeed

I heard a detergent mixes oil and water in high school chemistry. I am not sure I would put it in glow fuel with a motor I care about though. Most of them are water based. Might be an experiment if you have nothing to do. It may foam up too much or take too much to have an effect. ( I failed grade 12 chemistry too if you really want to know.)

Our oil and fuel is soluble in water so detergent really in't required.
Sport_Pilot is offline  
Reply With Quote
Old 02-11-2012, 02:21 PM
  #9
aspeed
 
aspeed's Avatar
 
Join Date: Jul 2011
Location: Ruthven, ON, CANADA
Posts: 2,841
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: How to keep castor from seperating in cold?

Unless the detergent makes it more soluble so it doesn't separate.  I was worried about the water in the detergent ruining the motor.
aspeed is offline  
Reply With Quote
Old 02-11-2012, 03:03 PM
  #10
Sport_Pilot
 
Sport_Pilot's Avatar
 
Join Date: Jan 2002
Location: Acworth, GA
Posts: 16,889
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: How to keep castor from seperating in cold?


Quote:
ORIGINAL: aspeed

Unless the detergent makes it more soluble so it doesn't separate. I was worried about the water in the detergent ruining the motor.

No the detergent would not be any help. Acetone might.
Sport_Pilot is offline  
Reply With Quote
Old 02-11-2012, 04:58 PM
  #11
Max_Power
Thread Starter
 
Max_Power's Avatar
 
Join Date: May 2005
Location: Savage, MN
Posts: 567
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: How to keep castor from seperating in cold?

The Acetone worked well...as did a slightly warmer storage area, Honestly I'd just shake it up right before I use it before I started adding anything too weird or water to the stuff. I think if it were any weaker than 40% It would'nt have done it? Todd
Max_Power is offline  
Reply With Quote
Reply


Thread Tools
Search this Thread
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -8. The time now is 06:19 PM.