661 Oil Test 32:1 vs 40:1 vs 50:1 ?

[Marshy]

Is 5 gallons enough run time? Someone posted a pic of there piston tops the other day which was run on 800t and there was "zero" deposits after.

Probably not. I've run 300 miles on a new snowmobile top end and it was just starting to show carbon shadow on te domes.

 

[Marshy]

Maybe so but why is their oil left behind on the surfaces if it isnt seperating?

Gas evaporates and leaves behind oil. Besides what you were seein wasn't all oil but still a solution of oil and gas.

 

[KG441c]

Gas evaporates and leaves behind oil. Besides what you were seein wasn't all oil but still a solution of oil and gas.

Oh ok. Do some oils stay behind and adhere better than others?

 

[blsnelling]

And do different oils react differently in that enviroment?

What do you mean by react differently?

Im not sure exactly! Lol! Thinkin out loud mostly but was wondering if the oil is seperating in the crankcase and adhering to the surfaces, is it more desirable for it to seperate sooner or later and does compression affect this and do different oils do this better than others according to their makeup?

Why do you believe the oil separates out of solution? I don't think that happens. I've never heard of it happening and don't see how that is possible. If you have some supporting data I would like to read about it. I think your are over complicating things in your own mind.

Maybe so but why is their oil left behind on the surfaces if it isnt seperating?

Gas evaporates and leaves behind oil. Besides what you were seein wasn't all oil but still a solution of oil and gas.

I think you're way over thinking this. I don't see it as a function of a particular oil or engine. That's just how all 2-stroke engines work. A particular oil lubricates well, or it doesn't. A particular oil burns well, or it doesn't.

 

[KG441c]

Personally I think a better indicator of lubrication in these oils we r discussing would be film strength rather than flashpoints? Im not buying oil is oil. Different additives will make oils react either better or not

 

[KG441c]

I think you're way over thinking this. I don't see it as a function of a particular oil or engine. That's just how all 2-stroke engines work. A particular oil lubricates well, or it doesn't.

And thats what im getting at. Oil isnt oils? Some r better than others depending on the formulation

 

[bwalker]

Why do you believe the oil separates out of solution? I don't think that happens. I've never heard of it happening and don't see how that is possible. If you have some supporting data I would like to read about it. I think your are over complicating things in your own mind.

That's exactly what happens. Premix enters the crank case in the form of fine liquid droplets. It then encounters the high temps of the internal parts after which the fuel vaporize and the oil is deposited on said internal parts. Of course the high boiling point components of the fuel may not vaporise, but the majority of it does.
One of the reasons a two stroke smokes alot at startup is that the motor is cool and a large part of the fuel mixture makes it to the combustion chamber in liquid form. Liquids don't combust so the engine is doggy and smoky till it comes up to temp.

 

[blsnelling]

Different additives will make oils react either better or not

I don't think oils react at all. Perhaps an engine reacts differently to different oils, but an oil is what it is, regardless of the engine it's in. With that said, some oils are going to work better in different engines.

 

[KG441c]

Brad theres alota folks on here that think any of the oils are good. Im not buying it. Personally I may give the Lucas a serious try

 

[bwalker]

Personally I think a better indicator of lubrication in these oils we r discussing would be film strength rather than flashpoints? Im not buying oil is oil. Different additives will make oils react either better or not

film strength is a components of viscosity. High viscosity oils have higher flashpoints.
In a two stroke it's far more complex than just film strength or else we would be running castor oils.

 

[Mastermind]

Here Keith......

Enjoy this read.

http://www.wdarc.org/articles_files/2 stroke Oil Test.pdf

 

[bwalker]

Please do tell...
Are you also saying that huskstihl and the RC guys tune is overly rich hence why there getting no deposits and you are?

That could be one reason.

 

[KG441c]

Here Keith......

Enjoy this read.

http://www.wdarc.org/articles_files/2 stroke Oil Test.pdf

Well Randy you know we have been down this oil thing before! Ratio, octane, Brands, additives. We r never gonna get to a conclusion. What was the statement I remember? Never take any one persons advice as gospel?

 

[bwalker]

Here Keith......

Enjoy this read.

http://www.wdarc.org/articles_files/2 stroke Oil Test.pdf

I have seen that test and others like that. The problem with them is they are ran at steady throttle and for a limited amount of time.

 

[bwalker]

Has anyone considered the corrosion protection factor? Some synthetics are terrible at this, especially ester synthetics.

 

[KG441c]

I have seen that test and others like that. The problem with them is they are ran at steady throttle and for a limited amount of time.

But chainsaws are steady throttle especially in bigwood?

 

[KG441c]

Has anyone considered the corrosion protection factor? Some synthetics are terrible at this, especially ester synthetics.

But wouldnt the corrision only be a factor if the equipment was sat up?

 

[blsnelling]

Brad theres alota folks on here that think any of the oils are good. Im not buying it. Personally I may give the Lucas a serious try

With today's technology, most oils are very good. It's nothing like the oils off yester years. I don't specify to my customers what oil to use. I simply tell them to use a full synthetic (cleaner burning) and mix it at 32:1, no less than 40:1.

 

[KenJax Tree]

I have some Bel Ray MC-1 i got from my MX buddy i want to use up....good? Bad? I assume its on par with Motul 710, its a synthetic oil but don't have all the additives for power valves and stuff like 800 and H1R

 

[blsnelling]

In a two stroke it's far more complex than just film strength or else we would be running castor oils.

Yes, I have considered that. That is no longer a concern with most of these ester based oils we're talking about. They have additives in them to deal with that.