OK, another "ambiguous" bite....
Specific gravity of....
40:1 is .863
50:1 is .812
Which one's richer?:greenchainsaw:
Specific gravity of....
40:1 is .863
50:1 is .812
Which one's richer?:greenchainsaw:
What fuel/mix do you use?
- Thread starter Yoyo
- Start date
Help Support Arborist Forum:
chopperfreak2k1
Addicted to ArboristSite
OK, I'll bite....
40:1 has 3.2 oz oil
50:1 has 2.6 oz oil.
Uhhhh, which one's richer.
the 50:1 is, it has more fuel per volume
chopperfreak2k1
Addicted to ArboristSite
yeah i guess more oil could be thought of as richer. i associate richer and leaner with carb conditions where more fuel is richer, more air is leaner. so with mix i automatically think richer=more gas
GASoline71
Mr. Nice Guy
Me too... I look at it from a hot rodder point of view more fuel = richer. So more oil in the fule makes a leaner fuel charge. But some will agrue different.
Gary
Gary
chopperfreak2k1
Addicted to ArboristSite
OK, another "ambiguous" bite....
Specific gravity of....
40:1 is .863
50:1 is .812
Which one's richer?:greenchainsaw:
sorry man you got me here, i don't know anything about "specific gravity". if i had to take a guess i would say it looks like 50:1 is less dense or heavy due to having more fuel per volume. where as the fuel will be "lighter" than the oil?
chopperfreak2k1
Addicted to ArboristSite
yeah i never stopped to think it could be looked at as more oil = richer
ozzy42
Addicted to ArboristSite
I could be bass ackwards in my terminoligy:monkey:
I'll rephrase it .
''I prefer to run a more diluted mix''
Like others have posted ,I think the 50:1 comes from government standrds.
Just like all the cars with their lean burn settings these days.
Last edited:
I use a "major brand" 93 octane with Stihl Ultra at 50:1 with BRP's 2+4 fuel conditioner.
hybridkarpower
Green eyes in the dark
I use the "fatter" vs. "leaner" analogy where higher oil concentration = fatter, lower oil concentration = leaner.
Nothing high tech, just easier for me to remember instead of the richer vs. leaner.
Nothing high tech, just easier for me to remember instead of the richer vs. leaner.
hybridkarpower
Green eyes in the dark
How I remove ethanol
I have used this method to minimize ethanol % in my 2-cycle mixture for several yrs & never had to replace a single fuel line yet.
Fill up any 5 gallon tank w/ high octane gas plus fuel stabilizer. Let the tank sit, undisturbed for 1 week.
Siphon the gas w/ an electric gas pump, but starting at the "top" part of the tank & gradually work your way down.
Stop at about 1 inch from the bottom, toss the remaining gas or save it for parts cleaning. Reason being gasoline is "non-polar" & ethanol is "polar", they don't stay mixed forever. Given enough time ethanol will precipitate to the bottom.
Worked well for me the last 6-7 yrs. Haven't replaced a gas line yet.
I have used this method to minimize ethanol % in my 2-cycle mixture for several yrs & never had to replace a single fuel line yet.
Fill up any 5 gallon tank w/ high octane gas plus fuel stabilizer. Let the tank sit, undisturbed for 1 week.
Siphon the gas w/ an electric gas pump, but starting at the "top" part of the tank & gradually work your way down.
Stop at about 1 inch from the bottom, toss the remaining gas or save it for parts cleaning. Reason being gasoline is "non-polar" & ethanol is "polar", they don't stay mixed forever. Given enough time ethanol will precipitate to the bottom.
Worked well for me the last 6-7 yrs. Haven't replaced a gas line yet.
Banacanin
Addicted to ArboristSite
The new Arborist Site Policy is that whenever a noob asks this, we direct them to pm Gasoline71.
THANKS GARY!
chevyforlife21
ArboristSite Guru
93 octane maxima 2 stroke race oil
Stealth
ArboristSite Lurker
You were right the first time. Rich vs. lean are terms normally used for fuel to air mix ratio's, not fuel to oil mix ratios. Adding more oil doesnt richen the fuel mix, it just lubricates it.
I add more butter & cream to dessert recipes to make them richer.
GASoline71
Mr. Nice Guy
Stihl has been recommending 50:1 for decades... so gov't gots nothin' to do with it.
Gary
chopperfreak2k1
Addicted to ArboristSite
yeah i'm not disagreeing with that, i just meant i never thought that some could be in our discussion and using the terms differently than me.
Beowulf
ArboristSite Member
Yeah, I always think of rich vs. lean as air/fuel ratio.
Adding a little more or less oil to the "fuel" side should not change the A/F ratio much, since oil is technically a fuel, as well, with some BTU's in it ... my cents. Let the carb sort it out!
Stealth
ArboristSite Lurker
Yeah we're all pretty much splitting hairs here over terminology moreso than functionality.
But I guess thats that the interweb is for
TO the OP, I ballpark somewhere between 35-50:1. I havent seen a huge difference in performance or longevity by being much more precise that that, in any of my 2 stroke machines (sled, dirt bike, waverunner, outboards, saws). Of course, an EFI machine would likely be fussier, but it likely takes care of its own oil ratios.
Last edited:
stihl oiling
I went to the stihl website to get their opinion of oil / fuel mixture ratios and was told that they recommend 50 to 1 "Stihl brand oil" for all their machines-----BUT--- if you want to use a different 2 stroke oil, mobil, marine or whatever, then it needs to be mixed at 25 to 1 because of the lubricants and properties in the Stihl brand oil. The Stihl brand has synthetic properties not found in regular 2 stroke oils.
I went to the stihl website to get their opinion of oil / fuel mixture ratios and was told that they recommend 50 to 1 "Stihl brand oil" for all their machines-----BUT--- if you want to use a different 2 stroke oil, mobil, marine or whatever, then it needs to be mixed at 25 to 1 because of the lubricants and properties in the Stihl brand oil. The Stihl brand has synthetic properties not found in regular 2 stroke oils.
