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2 cycle fuel in 4 cycle engine - 8/23/2006 8:23:58 PM   
thunderchicken


 

Posts: 82
Joined: 9/10/2003
From: san franciscoca, USA
Status: offline 		I've been hearing it's O.K. to use my 15% 2 stroke Omega fuel in my O.S. Surpass 4 stroke. But then I also hear it can "gum up" the valve. It would be great to not have to take two different fuels out to the field but I also don't want to mess up my engine. Any thoughts?

Thanks
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RE: 2 cycle fuel in 4 cycle engine - 8/23/2006 9:12:06 PM   
abacro


 

Posts: 168
Joined: 10/14/2002
From: Gadsden, AL, USA
Status: offline 		You can safely run 2 stroke fuel in any 4 stroke.you just cant run 4 stroke fuel in a 2 stroke. 2 stroke fuel has more oil content then the 4 stroke fuel so it dosent bother the 4 strokes. But 4 stroke fuel usually has less oil content and if run in a 2 stroke,it'll burn them up.

(in reply to thunderchicken)
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RE: 2 cycle fuel in 4 cycle engine - 8/23/2006 9:17:16 PM   
thunderchicken


 

Posts: 82
Joined: 9/10/2003
From: san franciscoca, USA
Status: offline 		Thanks. That's what I figured.

One more question though. Why use the 4 cycle fuel at all? Does it provide more power? Run cleaner maybe?

Thanks

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RE: 2 cycle fuel in 4 cycle engine - 8/23/2006 9:23:17 PM   
exeter_acres



Posts: 6074
Joined: 9/22/2004
From: Johns Creek, GA, USA
Status: offline 		Bah...


I use Powermaster YS20/20 in everything.... as long as the oil is around 18% or better... go fly!

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RE: 2 cycle fuel in 4 cycle engine - 8/23/2006 10:12:02 PM   
TLH101



Posts: 5512
Joined: 12/27/2001
From: Corpus Christi, TX, USA
Status: offline 		2 cycle fuel, 4 cycle fuel. I think it's all marketing. In fact, some fuel makers don't differentiate between the 2 fuels. Use a good quality fuel with nitro and oil mix you feel good about. I personally use Byrons 10% nitro with 18% castor blend in all my glow engines. I have for years, with zero bearing or build-up problems. I don't have any Saitos, or YS's anymore, so I don't really need the higher nitro.
Quality is the most important. I see brands in shops now, I have never heard of. No thanks, I'll pass.

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RE: 2 cycle fuel in 4 cycle engine - 8/23/2006 11:56:46 PM   
loughbd


 

Posts: 2111
Joined: 11/29/2003
From: Bremerton, WA, USA
Status: offline 		I run all my glow engines except the Tartans on 10% nitro, 20% oil and they run just fine. Ithink if you lok at the OS instructions, you will find they don't mention 4 cycle fuel at all. Just to use at least 18% oil with at least some castor.

I do run my YS on Cox Blue can which is 25% nitro and 20% castor but that's cause I got a deal in20 gallons of the stuff.

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RE: 2 cycle fuel in 4 cycle engine - 8/24/2006 12:15:46 AM   
Ejiro


 

Posts: 108
Joined: 5/13/2005
From: Chestermere, AB, CANADA
Status: offline 		It is interesting what goes around, and the number of different opinions there are on the subject.

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RE: 2 cycle fuel in 4 cycle engine - 8/24/2006 12:51:15 AM   
Parkerm



Posts: 157
Joined: 6/5/2002
From: Carlsbad, NM, USA
Status: offline
quote:

2 cycle fuel, 4 cycle fuel. I think it's all marketing.


Amen to that. It's the engine manufacturers requirements that count....and I've been known to cheat on that a little.


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RE: 2 cycle fuel in 4 cycle engine - 8/24/2006 6:34:09 AM   
submikester


 

Posts: 1252
Joined: 8/13/2004
From: El Segundo, CA, USA
Status: offline 		As said above; 4 strokes don't require as much oil in the mix as 2 strokes do so the "4 stroke" mixes typically have less oil. Then you have the oddball 20/20 that's 20% oil. When I run my 24 year old os 120 4 stroke (pre surpass) engine on the 20/20 it doesn't idle as smoothly or as low as it does with the regular 15% with 18% oil.

It's a very minute difference though so I don't worry about it, power with the 20% is quite good and it IS more oil so that's always good so far as longivity is concerned. I would only worry about higher amounts of pure castor and it sitting for longer periods of time giving the oil a chance to gum up. Regular running typically keeps engines clean in my experience unless you're in very hot climates like the desert. When I lived out there we ran things a bit richer and oil would tend to cake on the outside of the engine more than I see now in the more temperate climate I'm in.

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RE: 2 cycle fuel in 4 cycle engine - 8/24/2006 1:07:50 PM   
TLH101



Posts: 5512
Joined: 12/27/2001
From: Corpus Christi, TX, USA
Status: offline 		I do remember when most every fuel mfg had a "4-stroke" fuel. Some had less oil, reasoning that the 4-strokes runs less RPM and therefor needed less oil, and some had more oil since 4-strokes had more moving parts, & therefor needs more oil. I wonder which is really more acurate?

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RE: 2 cycle fuel in 4 cycle engine - 8/24/2006 8:34:01 PM   
RC-Bearings



Posts: 220
Joined: 10/8/2003
From: Glendale, AZ, USA
Status: offline 		MOST 4 strokes are lubricated by combustion blow by. That means they aren't constantly getting the lower end washed with fresh fuel like the two strokes. The bearings tend to take on as much oil as they need and the rest goes out the breather. That is probably why less oil was used in some 4 stroke blends.

YS 4 strokes are different! The get a fresh cleaning every stroke so they need more oil.

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RE: 2 cycle fuel in 4 cycle engine - 8/24/2006 9:30:13 PM   
errie



Posts: 93
Joined: 5/10/2005
From: Knysna, SOUTH AFRICA
Status: offline 		Mix your 2 stroke and 4 stroke fuel (50/50) I have mixed morgan green and morgan pink, works like a charm in my OS Surpass 52 and 70. By mixing the two fuels you are getting castor lubrication (good for all those moving parts of a 4 stroke), but not that much to give you castor burnup on the valves. Allso by mixing the two fuels you keep the oil content exactly the same.

This solved my problem of carrying two types of fuel to the flying field.

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RE: 2 cycle fuel in 4 cycle engine - 8/24/2006 11:18:02 PM   
BarracudaHockey



Posts: 10802
Joined: 7/13/2003
From: Orange Park, FL, USA
Status: offline 		Most of its in the labeling. Look at Morgans web site, the 15 percent heli, 2 stroke, and 4 stroke are the same mix, seems like colored fishing lures are made to catch fishermen, so are fuel labels.

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