What oil is best? and what ratio?

[Mastermind]

Redbull660 did a very in depth oil test on the MS661 that really opened my eyes. Even at 32:1 with Belray H1R the saws lost about 30% in cut speed over 50:1.

 

[Keith Gandy]

That's a lot of oil. I'm not surprised with your findings though.

On the new Autotune saws though, they can't tune themselves with that much oil. It puts them outside their calibration parameters.

Thats hp2 @ 32to1 in a 241 thats been strato gutted and was ran wot the last 5 tanks cutting cookies and shut down at wot. Alota oil left

 

[Mastermind]

Keith, have you tried Yamalube 2R yet?

 

[Keith Gandy]

Keith, have you tried Yamalube 2R yet?

Its what im running in my 241 right now with 87efree. After several more tanks ill take it back down and see what it looks like as im adding the new manifold with the baffle intact back in

 

[Mastermind]

I'd leave the gutted one on. Did you pull the divider out of the carb?

 

[Keith Gandy]

I'd leave the gutted one on. Did you pull the divider out of the carb?

No the plastic baffle on the carb is intact but everything to the window is gutted

 

[Ron660]

View attachment 3050
Thats hp2 @ 32to1 in a 241 thats been strato gutted and was ran wot the last 5 tanks cutting cookies and shut down at wot. Alota oil left

What did that piston crown look like before using HP2?

 

[Ron660]

View attachment 3050
Thats hp2 @ 32to1 in a 241 thats been strato gutted and was ran wot the last 5 tanks cutting cookies and shut down at wot. Alota oil left

Any issues with mtronics in that 241 using that much oil?

 

[Keith Gandy]

What did that piston crown look like before using HP2?

I clean it everytime before using a new oil

 

[Keith Gandy]

Any issues with mtronics in that 241 using that much oil?

Runs good on topend but after a long idle it has a bobble until the trigger is feathered but im thinkin thats mtronics related and not the oil

 

[Ron660]

I clean it everytime before using a new oil

Ever use that ring-free anymore?

 

[Keith Gandy]

Ever use that ring-free anymore?

No I dont worry about alil carbon buildup because I know its normal and is a sign of complete combustion. The yamaha ring free and stihl decarbonizer was intended for powervalves and valves in 4 stroke motors but it wont hurt to use alil in a chainsaw or other power equipment and will help if ones focus is a clean piston

 

[Wendell]

Redbull660 did a very in depth oil test on the MS661 that really opened my eyes. Even at 32:1 with Belray H1R the saws lost about 30% in cut speed over 50:1.

Interesting; some of the tests I read where based on air cooled motorcycles & the thicker they ran them showed more HP; they thought it was sealing the rings better. Do you know anyone with a chainsaw dyno? I was thinking about building one using a small single stage hydraulic pump ran with the proper belt pulley gearing to compensate for the saws rpms & the much slower rpms required on the pump side; if you've got pressure & flow a simple formula will give you HP. Looks like the most expensive thing will be a reliable high pressure gpm meter

 

[junkman]

Interesting; some of the tests I read where based on air cooled motorcycles & the thicker they ran them showed more HP; they thought it was sealing the rings better. Do you know anyone with a chainsaw dyno? I was thinking about building one using a small single stage hydraulic pump ran with the proper belt pulley gearing to compensate for the saws rpms & the much slower rpms required on the pump side; if you've got pressure & flow a simple formula will give you HP. Looks like the most expensive thing will be a reliable high pressure gpm meter

My findings ,thougj could be wrong. ,what works in a 50 hp dirtbike may bog a 5-8 hp saw and lose power. I may be wrong though .i have no dyno

 

[Mastermind]

Interesting; some of the tests I read where based on air cooled motorcycles & the thicker they ran them showed more HP; they thought it was sealing the rings better. Do you know anyone with a chainsaw dyno? I was thinking about building one using a small single stage hydraulic pump ran with the proper belt pulley gearing to compensate for the saws rpms & the much slower rpms required on the pump side; if you've got pressure & flow a simple formula will give you HP. Looks like the most expensive thing will be a reliable high pressure gpm meter

It just so happens, there are a few guys brainstorming dyno builds here using the conversations as a thread.

It's not ring seal that slows down the A/T saws. It seems to have something to do with the oil inhibiting combustion.

 

[mdavlee]

It just so happens, there are a few guys brainstorming dyno builds here using the conversations as a thread.

It's not ring seal that slows down the A/T saws. It seems to have something to do with the oil inhibiting combustion.

Belray was the worst. Motul 800 doesn't seem to slow them down as much but it makes a mess in a 550xp.

 

[Keith Gandy]

It just so happens, there are a few guys brainstorming dyno builds here using the conversations as a thread.

It's not ring seal that slows down the A/T saws. It seems to have something to do with the oil inhibiting combustion.

Im buying that and its what Ben has said for awhile. Look at my piston and all the oil left and I ran the heck out of that little saw for about 5 tanks one cut after another at wot! Im trying r2 which I think will burn more complete than the thicker oils. K2 may still be a best bet or r2

 

[Ron660]

It's not dirty but it makes a mess on the mufflers. It just won't get hot enough to burn it.

Do you think 87 octane will produce more engine heat than 93 helping with combustion of these high viscosity racing oils?

 

[Ron660]

Im buying that and its what Ben has said for awhile. Look at my piston and all the oil left and I ran the heck out of that little saw for about 5 tanks one cut after another at wot! Im trying r2 which I think will burn more complete than the thicker oils. K2 may still be a best bet or r2

R2 has a very similiar viscosity as chainsaw oils. R50 and 800 has two-times the viscosity. Mike, ever use R2?

 

[mdavlee]

Do you think 87 octane will produce more engine heat than 93 helping with combustion of these high viscosity racing oils?

I think it will be close to the same heat. The VP burns very clean so I don't know what caused the build up so quick besides the oil.