Oil questions...

[bwalker]

Any fuel is toxic … as far as your health concerns I assure you that alkylate fuel is far less toxic to you than what comes out the pump! View attachment 473060

I posted the MSDS....

 

[edisto]

The point about not making the exhaust port port walls mirror smooth is an interesting one. A rough surface reduces laminar flow at that surface by creating small vortices. This prevents formation of a boundary layer (zero flow at the surface). In the intake, this minimize the amount of fuel that gets trapped on the surface, and break larger suspended droplets into smaller droplets, creating a more uniform distribution.

It never occurred to me that preventing a boundary layer in the exhaust might have a similar effect that reduces carbon deposition.

 

[SawAddictedFarmer]

Well I mixed up 2 gallons of 32:1 and if my boss finishes a job in time were going to go play around with some Ash of his. I'll get videos of the new MMWS462 running but I'm not on YouTube so if someone else wants to put them up I'll email them to you.

 

[SawAddictedFarmer]

Well I mixed up 2 gallons of 32:1 and if my boss finishes a job in time were going to go play around with some Ash of his. I'll get videos of the new MMWS462 running but I'm not on YouTube so if someone else wants to put them up I'll email them to you.

Well his job went South so we rescheduled for Friday. Instead we butchered the huge 8 point buck we found at the end of our driveway! One back quarter was mashed but the rest was good. Whoever it was just drove off because the police said no one reported it and we were free to keep it.

 

[bwalker]

The difference in lubricity between FB and FD oils is non-existent. The FD oils produce less smoke/carbon, I will give you that. Imho … ALL modern mix oil(s) will do the job satisfactorily… pick one and go cut wood

It is true that the lubricity standard for FB, FC,FD is the same. Its a mistake to also believe that FC and FD oils dont exceed the minimum standard.
With that said lubricity is a fairly useless spec. In the seventies brite stock based oils had good lubricity as did castor oils. Yet, both suck in modern chainsaws.
The Cleanliness of an oil also leads to reduced wear.

 

[bwalker]

Any fuel is toxic … as far as your health concerns I assure you that alkylate fuel is far less toxic to you than what comes out the pump! View attachment 473060

In the first place be aware that the term alkykate is a blanket term for a variety of products. A look at the MSDS I posted shows this. The process unit that produces alkylate is the alkylation unit. If it is ran to its max efficiency, and its feed is pure, which it never is, the product it produces would be mostly isooctane which is rated at 100 octane. Notice your canned fuel is rated at something like 94? IE its not pure anything. It's a soup just like gasoline
The marketing blurb you posted has varying degrees of truth to it and is misleading at best. Thats marketing.
Lastly, my working life is spent working in a FCC unit, which is the primary supplier of feed to the aklyation unit. What I am telling you is the truth.

 

[bwalker]

The point about not making the exhaust port port walls mirror smooth is an interesting one. A rough surface reduces laminar flow at that surface by creating small vortices. This prevents formation of a boundary layer (zero flow at the surface). In the intake, this minimize the amount of fuel that gets trapped on the surface, and break larger suspended droplets into smaller droplets, creating a more uniform distribution.

It never occurred to me that preventing a boundary layer in the exhaust might have a similar effect that reduces carbon deposition.

My preference is for a bead blasted intake and a mirror finished exhaust port. I am not suggesting this is the best way. Its just my preference.
In a duct with unsteady gas flow the majority of the flow doesn't touch the walls anyways. This is referred to as "No Slip Condition".

 

[bwalker]

Saber smells pretty good. 710 also smells good. Dominator doesn’t really smell at all

Most oils that combust cleanly with sharp tuning dont have much smell.
Castor oil has that sweet racy smell because its not completely combusting.

 

[Fabulous]

STIHL Inc. Mix Oil Comparison - SlideServe

STIHL Inc. Mix Oil Comparison. STIHL Inc. Mix Oil Comparison. 500+ hour static run test Seven BR 600 blowers Test results from June 2006 Machines ran at W.O.T. 24 hours around the clock Represents approximately 1 year of professional use All oils mixed per manufacturer‘s instructions.

www.slideserve.com

 

[edisto]

My preference is for a bead blasted intake and a mirror finished exhaust port. I am not suggesting this is the best way. Its just my preference.

That was my thinking too, but now I'm curious about how a rougher finish on the exhaust port might affect carbon deposition.

I'll add it to my list of things that I want to experiment with, but probably will never get around to.

 

[Fabulous]

Check out slide 11 - the results will surprise you. I cannot find the msds sheets for motomix - must be a “secret proprietary ingredient” in it ! Any fuel that increases compression over 500 hours is worth investigating

 

[EFSM]

My preference is for a bead blasted intake and a mirror finished exhaust port. I am not suggesting this is the best way. Its just my preference.
In a duct with unsteady gas flow the majority of the flow doesn't touch the walls anyways. This is referred to as "No Slip Condition".

Ditto. I think a clean exhaust port that doesn’t build up carbon easily is more valuable than a slightly rough one that might.

 

[bwalker]

That was my thinking too, but now I'm curious about how a rougher finish on the exhaust port might affect carbon deposition.

I'll add it to my list of things that I want to experiment with, but probably will never get around to.

See the edit to my post.
I am certain that the rough finish doesn't hurt a thing and neither does a mirror finish. This is based on the unsteady gas flow dynamics of a duct and the No Slip Condition.
Mirror polishing started out as marketing IMO.

 

[EFSM]

That test looks fishy. I’ve seen buildup in engines like that only once or twice, and that was on high hour trimmers getting run without debris shields. ???

 

[bwalker]

Check out slide 11 - the results will surprise you. I cannot find the msds sheets for motomix - must be a “secret proprietary ingredient” in it ! Any fuel that increases compression over 500 hours is worth investigating

An example of 1 is statistically meaningless.
The most important alide is the one showing the valves. Notice that all the air cooled low ash oils show significant ash buildup on the valves, while the ashless Ultra does not. Ash buildup is what causes valve adjustment issues with the 4mix engine, which is why I recommend running Ultra in a 4mix.
I would absolutely not run Ultra in a two stroke chainsaw.
The methodology of running the engine wide open for 24 hours is laughable and blatantly favors an ashless oil like Ultra BTW. I addition such a test doesn't resemble how these motors are ran in real life at all. Sort of like the guy doing the high ratio trimmer tests on this site years ago. A good test needs realistic operating conditions and a statistically valid number of test units.

 

[bwalker]

That test looks fishy. I’ve seen buildup in engines like that only once or twice, and that was on high hour trimmers getting run without debris shields. ???

Its very fishy for the reasons I pointed out.

 

[Fabulous]

I’m 99.9% certain Husqvarna uses a similar 200hr continuous wide-open throttle test on their chainsaws (55 minute on 5 minutes idle) … I’ll see if I can find it in my archives to get rid of the fishy smell

 

[bwalker]

I’m 99.9% certain Husqvarna uses a similar 200hr continuous wide-open throttle test on their chainsaws (55 minute on 5 minutes idle) … I’ll see if I can find it in my archives to get rid of the fishy smell

Same applies to them if that's the case.

 

[Tomos770]

Its very fishy for the reasons I pointed out.

Its funny how much residue all oil choices except for ultra have.....

Especially slide with sparkplugs....

Amsoil @1:100 has the same deposits as mineral HP or Echo blend @1:50

LoL.....

 

[Tomos770]

Plus.....if OPE was running wot most of the thime....i would expect at least spotless sparkplugs....no matter which oil was used...