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Old Aug 23, 2005, 08:11 PM
Allan Schneider
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n/a Posts
2 vs 4 stroke glow fuel


Can anybody tell me what the effective difference between 2 stroke and 4
stroke glow fuel? ( Is it just percentage oil content?)

Can one type be used in the engine of other type given the same nitro
content?

Can cool power and omega be mixed if at the same nitro percent level?

Thank you .

ACE
Old Aug 23, 2005, 10:03 PM
Still Learning
sandburr's Avatar
Earling.Ia.
Joined Jun 2005
28 Posts
Byron's fuel out of Ida Grove told me that their 2 & 4 cycle fuel was the same, that they did was just put it in a different jug because some people wouldn't buy it if didn't say 4 cycle if that's the engine they had, I've burned their 2 cycle fuel in my OS 4 strokes for 15 yr's.without any problems or failures ahd I'm not good about winterstorage or the use of after run oil.
Garry
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Old Aug 23, 2005, 10:11 PM
Ted Campanelli
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n/a Posts
Re: 2 vs 4 stroke glow fuel

Ted shuffled out of his cave and grunted these great (and sometimes not
so great) words of knowledge:

> Can anybody tell me what the effective difference between 2 stroke and 4
> stroke glow fuel? ( Is it just percentage oil content?)


USUALLY, that is all it is, HOWEVER, a lot of 4 stroke fuels are all
synthetic oils. They say that castor oil will mess up the valves in a 4
stroke. I don't know. My Saito 72 is 3 years old and has about 2
gallons of 10% nitro with a synthetic/castor mix through it. I have had
no problems at all.
>
> Can one type be used in the engine of other type given the same nitro
> content?


I use the same fuel for both my 2 strokes and 4 strokes. I usually run
Byron's 10%, however recently I was given 4 gallons of 15% Cool Power,
so I have been running that.

>
> Can cool power and omega be mixed if at the same nitro percent level?


Yes, you can mix them, but I wouldn't. If you are going to mix them, I
presume at least one of the jugs has been in use for a while. If the
fuel in either jug has picked up water, you will be ruining all of the
fuel. For storage, I would keep the jug tightly capped and in a cool
environment (basement, etc ). If it is kept well sealed and cool, fuel
should last several years (or more).

>
> Thank you .
>
> ACE

Old Aug 24, 2005, 12:11 AM
Ed Paasch
Guest
n/a Posts
Re: 2 vs 4 stroke glow fuel

> Can anybody tell me what the effective difference between 2 stroke and 4
> stroke glow fuel? ( Is it just percentage oil content?)
>
> USUALLY, that is all it is, HOWEVER, a lot of 4 stroke fuels are all
> synthetic oils. They say that castor oil will mess up the valves in a 4
> stroke. I don't know. My Saito 72 is 3 years old and has about 2 gallons
> of 10% nitro with a synthetic/castor mix through it. I have had no
> problems at all.
>
>Can one type be used in the engine of other type given the same nitro
>content?


I've done a bit of reading about this topic. Conventional wisdom holds that
fuel for 4-stroke engines should be 100% synthetic oil instead of Castor oil
or a blend of synthetic and Castor oil. Conventional wisdom says that
Castor oil can cause excessive build-up in 4-stroke motors.

This conventional wisdom flies in the face of the recommended fuel by most
every major 4-stroke engine manufacturer:

Magnum recommends 20% Castor oil for break-in and 16% or more pure Castor
after break-in. A partial blend of Castor oil is required for warranty
coverage for Magnum 4-strokes.

Thunder Tiger's recommendations aren't listed on Ace Hobby's website, but
Tower Hobbies' tech notes mention that 2-stroke fuel is recommended for
Thunder Tiger 4-stroke engines, and not 4-stroke fuel.

O.S. doesn't require Castor oil, but it doesn't forbid it either. O.S. only
recommends fuel with 18% or greater lubricant content. Synthetic, Castor,
or a synthetic/Castor blend may be used. O.S. does note that certain
4-cycle fuels shouldn't be used because they have less than 18% lubricant
content.

Like O.S., the folks at YS don't forbid or demand Castor oil. Synthetic,
Castor, or blended lubricant can be used. YS recommends 20% to 24%
lubricant content, however. Like O.S., YS recommends avoiding 4-stroke fuel
with less than 20% lubricant content.

Of all of the major 4-stroke engine manufacturers that I checked, only Saito
specifically recommended synthetic lubricants over Castor oil. Saito also
recommends at least 20% lubricant content, and a mix of synthetic-castor oil
is acceptable.

When actual manufacturers' recommendations are examined, in almost all cases
the following parameters apply:

2-stroke fuel = 5% to 15% nitro content with 16% minimum lubrication,
synthetic, castor, or blended lubricants.

4-stroke fuel = 10% to 15% nitro content with 18% to 20% minimum
lubrication, synthetic, castor, or blended depending on manufacturer.

Is there a universal fuel? Sure! A fuel with 10% to 15% nitro and 20%
synthetic/castor blend lubrication will work with almost any 2-stroke or
4-stroke RC airplane engine from any manufacturer. A Saito purist may scoff
at the idea of of using blended lubrication, but even Saito says that 80/20
blended lubrication is just fine for their engines.


Old Aug 24, 2005, 08:11 AM
CJ
Guest
n/a Posts
Re: 2 vs 4 stroke glow fuel

Ed,

Thank you for your informative post. Your delivery was fantastic too, btw
: )).

CJ

"Allan Schneider" <allans@cloud9.net> wrote in message
news:skOOe.4437$_7.2569@fe08.lga...
>
> Can anybody tell me what the effective difference between 2 stroke and 4
> stroke glow fuel? ( Is it just percentage oil content?)
>
> Can one type be used in the engine of other type given the same nitro
> content?
>
> Can cool power and omega be mixed if at the same nitro percent level?
>
> Thank you .
>
> ACE



Old Aug 25, 2005, 04:11 PM
Ed Forsythe
Guest
n/a Posts
Re: 2 vs 4 stroke glow fuel

Nice (accurate) analysis Ed - congrats :-)
--
Tally Ho!
Ed
"Ed Paasch" <bigedmustafa@hotmail.com> wrote in message
news:FVROe.3999$Sj1.105@okepread04...
>> Can anybody tell me what the effective difference between 2 stroke and 4
>> stroke glow fuel? ( Is it just percentage oil content?)
>>
>> USUALLY, that is all it is, HOWEVER, a lot of 4 stroke fuels are all
>> synthetic oils. They say that castor oil will mess up the valves in a 4
>> stroke. I don't know. My Saito 72 is 3 years old and has about 2
>> gallons of 10% nitro with a synthetic/castor mix through it. I have had
>> no problems at all.
>>
>>Can one type be used in the engine of other type given the same nitro
>>content?

>
> I've done a bit of reading about this topic. Conventional wisdom holds
> that fuel for 4-stroke engines should be 100% synthetic oil instead of
> Castor oil or a blend of synthetic and Castor oil. Conventional wisdom
> says that Castor oil can cause excessive build-up in 4-stroke motors.
>
> This conventional wisdom flies in the face of the recommended fuel by most
> every major 4-stroke engine manufacturer:
>
> Magnum recommends 20% Castor oil for break-in and 16% or more pure Castor
> after break-in. A partial blend of Castor oil is required for warranty
> coverage for Magnum 4-strokes.
>
> Thunder Tiger's recommendations aren't listed on Ace Hobby's website, but
> Tower Hobbies' tech notes mention that 2-stroke fuel is recommended for
> Thunder Tiger 4-stroke engines, and not 4-stroke fuel.
>
> O.S. doesn't require Castor oil, but it doesn't forbid it either. O.S.
> only recommends fuel with 18% or greater lubricant content. Synthetic,
> Castor, or a synthetic/Castor blend may be used. O.S. does note that
> certain 4-cycle fuels shouldn't be used because they have less than 18%
> lubricant content.
>
> Like O.S., the folks at YS don't forbid or demand Castor oil. Synthetic,
> Castor, or blended lubricant can be used. YS recommends 20% to 24%
> lubricant content, however. Like O.S., YS recommends avoiding 4-stroke
> fuel with less than 20% lubricant content.
>
> Of all of the major 4-stroke engine manufacturers that I checked, only
> Saito specifically recommended synthetic lubricants over Castor oil.
> Saito also recommends at least 20% lubricant content, and a mix of
> synthetic-castor oil is acceptable.
>
> When actual manufacturers' recommendations are examined, in almost all
> cases the following parameters apply:
>
> 2-stroke fuel = 5% to 15% nitro content with 16% minimum lubrication,
> synthetic, castor, or blended lubricants.
>
> 4-stroke fuel = 10% to 15% nitro content with 18% to 20% minimum
> lubrication, synthetic, castor, or blended depending on manufacturer.
>
> Is there a universal fuel? Sure! A fuel with 10% to 15% nitro and 20%
> synthetic/castor blend lubrication will work with almost any 2-stroke or
> 4-stroke RC airplane engine from any manufacturer. A Saito purist may
> scoff at the idea of of using blended lubrication, but even Saito says
> that 80/20 blended lubrication is just fine for their engines.
>



 


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