Hate to say it...

[Ron660]

Best I remember my ported 660, using 800, produced the same HP on a dyno as another fuel and a different 2T.
Someone could dyno test different 2T oils but I doubt it'd reveal any significant difference.

 

[Ron660]

I'm all 'bout longevity in all my machines. Whatever is going to make it last is what I'm using.

Higher viscosity = higher film strength. Most chainsaw 2T oils have a viscosity around 8cSt. Racing 2T oils can be double that or more. A richer tune will not change viscosity but different temperatures will.

 

[Deets066]

A richer tune will not change viscosity but different temperatures will.

That’s the thing with saws, a richer tune will run at a lower temp. So technically a richer or leaner tune will change viscosity.

 

[Ron660]

That’s the thing with saws, a richer tune will run at a lower temp. So technically a richer or leaner tune will change viscosity.

If your tune results in a temperature change the viscosity will change. Cooler temps higher viscosity.

 

[Deets066]

If your tune results in a temperature change the viscosity will change. Cooler temps higher viscosity.

Agreed

 

[RI Chevy]

That’s the thing with saws, a richer tune will run at a lower temp. So technically a richer or leaner tune will change viscosity.

How does this happen if the oil and gas are pre-mixed in a tank?

 

[GCJenks204]

How does this happen if the oil and gas are pre-mixed in a tank?

The same way temp and altitude can affect tune. Science..

 

[blsnelling]

What's the oil of the day? Do we like it wet or dry? I'm so confused!

 

[Deets066]

How does this happen if the oil and gas are pre-mixed in a tank?

It doesn’t affect anything in the tank. A leaner tune will run a higher exhaust temp. Viscosity of the oil only changes in the engine

 

[Deets066]

What's the oil of the day? Do we like it wet or dry? I'm so confused!

Somewhere in the middle

 

[RI Chevy]

OK. So our 2 stroke oil has variable viscosity? Like 5W30 oil for 4 strokes?
I would think if one ran a rich tune that it would just add more fuel and oil. I wouldn't think that the oil would get thinner or thicker.

 

[RedGas]

I think what he' s saying is that a leaner tune, by making the engine run hotter, makes the oil hotter, making it less viscous.

It's all a function of temperature. If the temperature didn't change, the viscosity wouldn't change.

Or that's the way I'm interpreting it.

 

[Deets066]

OK. So our 2 stroke oil has variable viscosity? Like 5W30 oil for 4 strokes?
I would think if one ran a rich tune that it would just add more fuel and oil. I wouldn't think that the oil would get thinner or thicker.

Ok here’s a test for ya, put some of your favorite 2 stroke oil in the fridge. Then put some in a pan on the stove and heat to 200 degrees. Which oil will be thinner than the other.

PS. You may want to use klotz because in will make your kitchen smell wonderful when you put it on the stove.

 

[Ron660]

Most 2-cycle Tech data sheets show the viscosity of the oil at two different temps....usually 40C & 100C. Here's Motul 710:
40C - 46.4
100C - 8.9

 

[Cut4fun]

Guys and their oil debates.

Question is what would you trust in a 3000-5000 hotsaw running alky/nitro.

 

[RI Chevy]

OK. I appreciate the insight. Not trying to be a douche. I didn't know that 2 stroke had sort of a variable viscosity. I thought it was just a constant. Like using straight 20W20 vs. 5W40.
I think I got it now. And I won't be cooking any Klotz. LMAO

 

[Deets066]

Guys and their oil debates.

Question is what would you trust in a 3000-5000 hotsaw running alky/nitro.

Klotz

 

[Ron660]

Guys and their oil debates.

Question is what would you trust in a 3000-5000 hotsaw running alky/nitro.

A very high viscosity. Probably 20+ cST at 100C.

 

[Deets066]

Very few oils mix with alcohol, Klotz is the only one I know for sure. Probly a few others though

 

[blsnelling]

OK. I appreciate the insight. Not trying to be a douche. I didn't know that 2 stroke had sort of a variable viscosity. I thought it was just a constant. Like using straight 20W20 vs. 5W40.
I think I got it now. And I won't be cooking any Klotz. LMAO

All oils thin as they warm up, be it single or multi viscosity.