Moisture in Methanol  
View related threads: (in this forum | in all forums)

Tower Hobbies
Enter up to 4 keywords or Tower stock numbers
Logged in as Guest



Users viewing this topic: none
  Printable Version
       


XYZ-50cc Gas Engine
Seller:  XYZUSA
Details:   $249.00   |  7/3/2008   |  Classified Ad
We will rotate YOUR AD in this spot if you select "Forum Featured" when placing or editing your ad!

All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> RC Fuels >> Moisture in Methanol
Page: <<   < prev  1 [2]

Login
Message << Older Topic   Newer Topic >>
Moisture in Methanol - 5/21/2002 8:59:58 PM   
w.pasman


 

Posts: 367
Joined: 4/23/2002
From: ----, NETHERLANDS
Status: offline 		Yes many thanks for these tests!

And is it true that tuning the engine leaner will make the engine running with 'watered' fuel? That's what ramcharger suggested in post #5.

(in reply to JoanC)
       Post #: 26

Moisture in Methanol - 5/22/2002 8:36:56 AM   
downunder-RCU



Posts: 1125
Joined: 12/27/2001
From: Adelaide, South Australia
Status: offline 		When we tune the mixture we're only concerned about getting the right volume of methanol/nitro flowing to match the airflow. So if you add a non-fuel such as oil or water to the mixture and leave the needle setting where it was then the volume of FUEL is reduced making it leaner.

However, I'd suspect that unless you're one of these people that tune for absolute maximum revs I doubt that any change would be noticed. I always run quite rich so even with the comparatively huge amount of water I added there was no difference in revs at all.

(in reply to JoanC)
       Post #: 27

Moisture in Methanol - 5/22/2002 10:40:48 AM   
w.pasman


 

Posts: 367
Joined: 4/23/2002
From: ----, NETHERLANDS
Status: offline 		Mmm you wrote

> 4% mix. Oh oh...very hard to start, runs awful,
> won't accelerate...absolutely impossible to use.

but it still might be usable when the engine is leaned out a bit (or alternatively, by putting it richer?). I wonder because you did not change the mixture at all, but of course different fuel requires different settings.

(in reply to JoanC)
       Post #: 28

Moisture in Methanol - 5/23/2002 5:17:01 PM   
downunder-RCU



Posts: 1125
Joined: 12/27/2001
From: Adelaide, South Australia
Status: offline 		[QUOTE]Originally posted by w.pasman

but it still might be usable when the engine is leaned out a bit (or alternatively, by putting it richer?). I wonder because you did not change the mixture at all, but of course different fuel requires different settings. [/QUOTE]
In this case the fuel was so bad I couldn't even get the engine to fire. I had to drip fresh fuel down the carb, fire it up and then it'd stop as soon as it had used up the prime. Opening the throttle while running on the prime also made no difference. The 3% water I'd used in the previous run had no affect whatsoever. The slight extra amount of water made a dramatic difference.

(in reply to JoanC)
       Post #: 29

Moisture in Methanol - 5/29/2002 5:44:38 PM   
Sport_Pilot



Posts: 7412
Joined: 1/21/2002
From: Acworth, GA, USA
Status: offline 		Could it be the separation of the oil causes enough friction to prevent the engine from running? Hope you haven't hurt your engine. Wonder if all synthetic oil will contain a larger percentage of water before separating?

(in reply to JoanC)
       Post #: 30

Moisture in Methanol - 5/30/2002 11:19:50 AM   
downunder-RCU



Posts: 1125
Joined: 12/27/2001
From: Adelaide, South Australia
Status: offline 		It wasn't a friction related issue because the engine felt just the same while hand starting. I would guess it was more likely to be the fact that the fuel was now in seperate globules of methanol/water and oil and that the globules of oil may have been coating the plug element and stopping any catalytic reaction. Another possibility is that the oil was seperating out and falling to the bottom of the tank and guess where the clunk is?

Although I haven't done side by side tests with castor and synthetic fuels it seems as though there's not much difference (if any) as to the percent of water that causes the oil to come out of solution. I don't know if nitro makes any difference and I'm not going to buy any "liquid gold" to find out (I'm in Australia so we don't get it out of a tap/faucet? like it seems the Yanks do )

(in reply to JoanC)
       Post #: 31

Moisture in Methanol - 5/30/2002 5:30:29 PM   
Sport_Pilot



Posts: 7412
Joined: 1/21/2002
From: Acworth, GA, USA
Status: offline 		Doununder,
You can only mix about 2 to 3% water to Nitro, so high nitro content would reduce the amount of water that can be asorbed. Hmmm, same amount you found before the oil seperates. Since methanol can mix in any percentage with both oil and water, I was supprised to find that the oil seperates at only 3%. I planned to test this with a small amount the next time I open a fresh gallon of fuel, but I forgot about it the last couple of gallons!

(in reply to JoanC)
       Post #: 32

Moisture in Methanol - 5/31/2002 6:54:27 AM   
downunder-RCU



Posts: 1125
Joined: 12/27/2001
From: Adelaide, South Australia
Status: offline 		Well I'm glad to see that finally someone else is going to do some tests. After all, I only used about an ounce of fuel in total so it's not exactly a high dollar experiment
The trick of course is being able to measure very small quantities of water to add to the mixture.

While it's true that water and methanol will mix in any proportions and that oil and methanol do the same, it's possible that a mix of all three react quite differently. Sort of the reverse to kero and castor which won't mix at all but add some ether and it all happily mixes together. Which is rather fortunate for those who run diesels (And I only learned this the other day..LOL)

(in reply to JoanC)
       Post #: 33

Page:   <<   < prev  1 [2]
All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> RC Fuels >> Moisture in Methanol
Page: <<   < prev  1 [2]





Jump to:


Google 



Search | Marketplace | Event Calendar | Local Clubs | Magazine | Product Ratings | New Products | Discussion Forums

Photo Gallery | Member Video Posts | RCU Video Gallery | Instructor Search | Field|Track|Marina Search

Advertisers | Hobby Vendor Resources | Rate Manufacturers | Sign In/Sign Up

SITE MAP!   : :   FORUM RULES

© 2001 - 2007 24-7 RC, LLC, all rights reserved.

Charities we support that also need your help
Yorkie Rescue | Humane Society | ASPCA | Crohn's-Colitis America

Kaango.com Classifieds

0.531RCU1