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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> RC Fuels >> cutting oil content
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cutting oil content - 7/18/2006 6:41:37 AM   
693bart


 

Posts: 29
Joined: 8/28/2005
From: moose jaw, SK, CANADA
Status: offline 		I have a OS 120 surpass that just will not run right on 2 stroke fuel . It loads up on idle and I have adjusted the needle valves and when I get it set so it will not load up at idle then it will die when I throttle up. it runs great on 4 stroke fuel . does anyone know how much methanol I have to add to 2 stoke fuel to bring the oil content from 18% to 15%? the fuel has 15% nitro and 67% methanol and the 18 % oil (caster/synthetic blend) The lhs does not carry 4 stroke fuel and the next place is 120 miles away but cant ship because it is considered Dangerous Goods
       Post #: 1

RE: cutting oil content - 7/19/2006 4:10:32 PM   
wcmorrison



Posts: 766
Joined: 10/2/2002
From: Weatherford, TX, USA
Status: offline 		I rather doubt the use of 2C fuel is your problem. How old is the fuel that gave you the problem? Sounds more like it needs a little better tuneing to dial in the needles for the different fuel. Changing from one level of lub to another does cause changes in the needles.

As a matter of course I use 2C fuel all the time in my 4Cs. I have a Saito 91s, Magnun 91, Magnum 52 and a OS Surpass II 70s. All do well on the fuel of the day.

Cheers,

Chip

(in reply to 693bart)
       Post #: 2

RE: cutting oil content - 7/20/2006 7:55:46 AM   
downunder



Posts: 3117
Joined: 10/10/2002
From: Adelaide, AUSTRALIA
Status: offline 		I have to agree it's something other than oil content because a 4 stroke simply can't load up like a 2 stroke. My guess would be either the tuning or the plug if the fuel is OK.

(in reply to wcmorrison)
       Post #: 3

RE: cutting oil content - 7/20/2006 1:34:43 PM   
RaceCity



Posts: 1842
Joined: 7/10/2002
From: NotUpNorth, USA
Status: offline 		Who knows what it REALLY is, but I had an OS 1.20 Surpass awhile back that ran like absolute cr_p on 20% oil, 2C fuel. No amount of needle twiddling would get rid of the "congestion".

Going to a lower oil content "4C" fuel made the motor very happy.

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RE: cutting oil content - 7/22/2006 7:00:12 AM   
693bart


 

Posts: 29
Joined: 8/28/2005
From: moose jaw, SK, CANADA
Status: offline 		I have tried 2 stroke fuel before and just like this time it loaded up . I have spent 3 trips to the field and tried setting the needles with no luck but I have been told by different people that the some 120 OS will do this but smaller OS 4 strokes will work and so will Saito so I guess will just have to wait till I can get some 4 stroke fuel .

(in reply to RaceCity)
       Post #: 5

RE: cutting oil content - 7/22/2006 3:22:13 PM   
Fuelman


 

Posts: 1009
Joined: 12/31/2001
From: Jordan, NY, USA
Status: offline 		I had one OS 120 Surpass that would run on nearly anything I put in the tank (within reason), high or low oil it did not matter. My other OS 120 ran like junk with anything but 14% or 15% oil in the fuel, and no more than 15% nitro. Both were the same series of Surpass. I never figured it out.


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Fuelman
Cooper Fuels LLC

(in reply to 693bart)
       Post #: 6

RE: cutting oil content - 7/22/2006 5:51:43 PM   
carrellh



Posts: 3321
Joined: 3/30/2003
From: Garland, TX, USA
Status: offline 		I have no idea whether it will solve the problem but I did calculate the answer to the question you asked.

Adding 26 ounces of methanol to a full gallon of fuel that has 18% oil and 15% nitro will give you

72.57% methanol
14.96% oil
12.47% nitro

If you want to maintain the nitro percentage, add 3.9 ounces of nitro and 22.1 ounces of methanol


< Message edited by carrellh -- 7/22/2006 6:00:42 PM >

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Regards,
Carrell

(in reply to 693bart)
       Post #: 7

RE: cutting oil content - 7/22/2006 8:35:48 PM   
RaceCity



Posts: 1842
Joined: 7/10/2002
From: NotUpNorth, USA
Status: offline 		Depending on what your LHS has to offer...mixing some "tiger blend", etc (low-oil fuel) with a gallon of your regular 2C blend in a 50/50 mix should give you somewhere around 15% oil in the resulting brew.

I wouldn't go too crazy cutting the oil back. You surely wouldn't want to be much below 15% IMO.

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AMA 63990

(in reply to carrellh)
       Post #: 8

RE: cutting oil content - 7/23/2006 6:21:53 AM   
Fuelman


 

Posts: 1009
Joined: 12/31/2001
From: Jordan, NY, USA
Status: offline 		Get a gallon of 20/20 fuel from most any manufacturer, and add 43 oz of methanol to it in a larger container, your net result will be extremely close to 15% nitro / 15% oil fuel (within a fraction of a percent).


_____________________________

Fuelman
Cooper Fuels LLC

(in reply to RaceCity)
       Post #: 9

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