I don't think anyone disputes oil has higher BTU's.
Two stroke fuel ratios
- Thread starter Eraser
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That video is beyond invalid for determining what ratio of oil is optimal for an engine. He didn't tune anything between ratio changes.
For any of this to be even close to accurate, it would need done on a dyno in a climate controlled test cell.
Typical YouTube garbage.
And only the chainsaw world even argues about this.. no one else cares.
To be fair, I have seen some back and forth debating on dirtbike forums on oil ratios, they're just as neurotic as chainsaw enthusiasts, I'd know since I'm both, haha.
Ratios, yes, but obsessing over a small increase in temp from running a little more oil, no.
You would be surprised, rc, many dirt bike/atv forums. even to the extent where some guys run exhaust and plug temp sensors to monitor temp while running.
I've stared at EGT and CHT gages more than I care to admit. What you learn is many things affect temps.
sand sock
ArboristSite Operative
Um, is that a whiskey bottle spout, someone left in the cylinder while porting?
You don't suppose you can turn a screw to add more fuel?
As far as carbon and exhaust gunk. Any engine can be made to run clean, even at something like 20:1 if the load and tuning are there.
In regards to your comment about zero wear. How do you know this and how many hours are on your equipment?
I have seen some scuffing on the piston skirts in equipment with high hours using 70 to 100:1 mix ratios
adedeluca
ArboristSite Lurker
You tubel is 90 confusion 10 truth
Just to throw in my .02, I just pulled my Stihl 038 magnum apart, one of the crank bearings failed, and the cylinder and piston look perfect. Saw is ported, higher compression, higher RPM more timing, etc. I run 40:1 VP 2 stroke oil and AV gas. No appreciable carbon buildup on the piston, muffler, etc after 500 or so hours
My efco trimmer came apart on me it was high hours 700+ pto side bearing lunched itself. The needle bearings got wadded up into the cylinder and piston pretty much destroyed the unit. I ran 87 E0 and 32:1 super tech in it since new.
Husky77
ArboristSite Operative
Does it say on the bottle "add to 5 litres of petrol" as husqvarna manuals will tell you to run at 50:1
I can only speak as I have found and that's here in the uk almost everyone using a saw professionally is 50:1 and over the pond in usa they tend to go 40:1
If I have this wrong please tell me, my saws are very happy at 50:1 and the saws I have worked on for others with ruined pistons & cylinders have run on 32:1. But probably if they are using crap oil at this ratio it is highly likely the chain is very blunt and they just keep pushing it. Education is a wonderful thing
100 ml of oil will require 4 litres or just over 1 us gallon (3.78 l.) of fuel for 40:1 Jake . Saw cylinder mettalurgy & oil technology govern the oil ratio changes over the last 20 yrs in my opinion . Before Nikisil cylinders a lot of galling & scoring was occurring requiring heavier viscosity oils & mix ratio's . 32:1 prior to 2003 was the norm . Around 2010 with better oil & saw cylinder construction 40:1 became more prevalent . Today most saw manufacturers recommend 50:1 along with epa . restrictions . I find this a little to little other than with recreational saw usage & a fat tune . I would never recommend 50:1 within any commercial saw application , even with Saber or Red Armor etc .Does it say on the bottle "add to 5 litres of petrol" as husqvarna manuals will tell you to run at 50:1
I can only speak as I have found and that's here in the uk almost everyone using a saw professionally is 50:1 and over the pond in usa they tend to go 40:1
If I have this wrong please tell me, my saws are very happy at 50:1 and the saws I have worked on for others with ruined pistons & cylinders have run on 32:1. But probably if they are using crap oil at this ratio it is highly likely the chain is very blunt and they just keep pushing it. Education is a wonderful thing
1 us gallon Jake , sorry missed this post bud !
Ok guys, I'm going to finally try to put this to rest. I sent this to project farm.
If anyone can think of anything else to add, let's hear it and I'll add it.
"@ProjectFarm
Would you be able to do a 2 cycle oil test? An arborist forum I belong to has a never ending thread that questions the difference in wear, power output, carbon build up, and difference in engine temperature between using different ratios. Example 25:1 vs 50:1 vs 100:1
The only way anyone would find it legitimate would be to do the necessary carburetor adjustments between the different ratios. I know you can finally put the debate to rest.
Love your videos!"
If anyone can think of anything else to add, let's hear it and I'll add it.
"@ProjectFarm
Would you be able to do a 2 cycle oil test? An arborist forum I belong to has a never ending thread that questions the difference in wear, power output, carbon build up, and difference in engine temperature between using different ratios. Example 25:1 vs 50:1 vs 100:1
The only way anyone would find it legitimate would be to do the necessary carburetor adjustments between the different ratios. I know you can finally put the debate to rest.
Love your videos!"
That guy is a complete joke and his tests suck.
To do a statistically valid test would require dozens if saws for starters.
