40:1 to rich?

[procarbine2k1]

No the guy telling you this don't know ****. I find synthetic burns more complete, thus less carbon, the regular stihl oil you will carbon up more. But it takes a long time to carbon up a saw, keep it tuned right and you wont have a problem. If it starts getting carbon'd up you need to decarbon before it causes a problem. Most people abuse their stuff, and perform no maintenance, thus burning up top ends.

What he said!

I am surprised that your Stihl tech would claim that saws are "burning up" with a 40:1 mix, using synthetic! I run 40:1 in ALL of my equipment (Stihl Ultra), and will continue to do so. Premature failure with this setup is the least of my concern. If ethanol was not a concern, I may try 50:1- but is not the case with todays fuel.

 

[Oldsawnut]

Hmm well I guess any saw that was built before 1990 was just prone to carbon failue no matter how it was tuned according to that saw tech..

 

[blsnelling]

Bottom line, 40:1 never burnt up a saw. I run all of mine at 32:1.

 

[atvdave]

I don't put a lot of faith in my local dealer. My local stihl dealer didn't even know what RSC chain was???

My local Dolmar dealer isn't any better... I won't even walk through his door anymore..

Take what he said with a grain of salt...

 

[RAMROD48]

Bottom line, 40:1 never burnt up a saw. I run all of mine at 32:1.

yours dont hold together long enough to burn up.....:hmm3grin2orange:

 

[Oldsawnut]

Geez Brad no wonder your saws suck I only wish my saws ran as crumby as yours

 

[rmihalek]

I just run everything at 32:1. It's easy math mixing 4 ounces to the gallon. Also, everyday is different as far as tuning goes, so whenever I fire up a saw, I'll warm it up for a few minutes, make a couple cuts, and then check it wide open. If it's not 4 stroking wide open, then I'll back out the H jet until it is. Definitely when doing mods or breaking in new saws, the operator needs to stay on top of the tuning.

 

[cowboyvet]

Stihl could sell more of their premium oil if it suggested 40:1.
If 40:1 made the saws more durable/reliable or perform better, it would be in Stihl's interest to suggest that ratio.

But Stihl suggests 50:1, even during break-in.

Not knocking anybody, just curious - what is it that people seek to gain via 40:1 (or even richer) and how does the richer mix acheive that goal?

Thanks

First off the EPA dictates what saw companies recommend to run in their saws without a care as to what is best for the saw.
Second is 40:1 is LEANER than 50:1. More oil in the mix means less fuel. Less fuel = leaner. Adjust your carb accordingly.
Third more oil means better lubrication. If you have modded your saw at all or abuse it such as using one for milling, extra oil adds a safety margin.
Last point is I have seen a ton of motors eat themselves for lack of lubrication. Its hard to argue a case of engine damage do to over lubrication.

 

[blsnelling]

yours dont hold together long enough to burn up.....:hmm3grin2orange:

Geez Brad no wonder your saws suck I only wish my saws ran as crumby as yours

I can feel myself getting anemic from all the blood loss:msp_scared:

 

[eMGunslinger]

yours dont hold together long enough to burn up.....:hmm3grin2orange:

 

[Jtheo]

Stihl could sell more of their premium oil if it suggested 40:1.
If 40:1 made the saws more durable/reliable or perform better, it would be in Stihl's interest to suggest that ratio.

But Stihl suggests 50:1, even during break-in.

Not knocking anybody, just curious - what is it that people seek to gain via 40:1 (or even richer) and how does the richer mix acheive that goal?

I have been under the impression that 50:1 was to satisfy the EPA, but I have no proof of that.

I have also read that in Germany 100:1 is required.

 

[Jtheo]

yours dont hold together long enough to burn up.....:hmm3grin2orange:

That's low.:hmm3grin2orange:

 

[blsnelling]

What's this orange and white fluid flowing from the cuts in my back?:msp_biggrin:

 

[eMGunslinger]

Possibly some type of infections.... probably should get that checked out ASAP

 

[2dogs]

Yep more oil results in lowering the octane rating and the saw can run hotter. This is worse out west where the sun is bigger.

I had run Opti 2 for years and then switched Stihl Ultra at 50:1 for a couple of years. I did not like the Ultra because of the smell so now I am back to running Opti at 100:1.

It has always been funny to me when people say that Stihl doesn't know what it is doing by recommending 50:1 or they say it is an EPA conspiracy to ruin all saws. All modern Stihl saws are desined to run at 50:1 for any normal work. (Milling may be different, I don't mill much so I don't know and I don't follow the milling threads.) Husqvarna says the same thing as Stihl and if there are other saw makers I bet they say the same thing. Somehow, guys like me are smarter than the engineers at Stihl? No I don't think so.

 

[Andyshine77]

Agree.... More oil in the mix=leaner Air/fule ratio, in turn will make your saw run hotter.

However many people run 40:1 with-out any issues.

The oils burns with the fuel, it changes the air/fuel very little if at all.

 

[Andyshine77]

Yep more oil results in lowering the octane rating and the saw can run hotter. This is worse out west where the sun is bigger.

I had run Opti 2 for years and then switched Stihl Ultra at 50:1 for a couple of years. I did not like the Ultra because of the smell so now I am back to running Opti at 100:1.

It has always been funny to me when people say that Stihl doesn't know what it is doing by recommending 50:1 or they say it is an EPA conspiracy to ruin all saws. All modern Stihl saws are desined to run at 50:1 for any normal work. (Milling may be different, I don't mill much so I don't know and I don't follow the milling threads.) Husqvarna says the same thing as Stihl and if there are other saw makers I bet they say the same thing. Somehow, guys like me are smarter than the engineers at Stihl? No I don't think so.

You do know Opti 2 is not even a full sys oil. I ran it for about a year, IMHO it's tar. Ultra and other syn oils are far Superior. Smarter than the engineers? no. Smarter than the EPA? YES!

 

[Andyshine77]

Here is a piston and cylinder that was out of a Stihl 441 that was run on 100:1 Amsoil. I think I'll pass on the 100:1 BS.

 

[roostersgt]

I ran a tank of Trufuel 40:1 through my saw and noticed it spit blackish spots all over near the exhaust port. It didn't do that before with the Stihl Ultra mized 50:1, nor does it do it with the Trufuel 50:1. I have to think based on these observations that my saw likes 50:1 stuff.

 

[Stihlman441]

So with this piston at 100:1 where does the carbin come from ? and whats the go with the blow bye below the rings ?.
What Ron, Octane fuel did it live on ?.

Andrew