What oil is best? and what ratio?

[jakethesnake]

I’m gonna gotta buy a tach.

 

[Dub11]

I think we found a new test for @Redbull661

 

[bwalker]

View attachment 120487

Here is a screenshot I took off the RP website.....I see what you mean about the tcw3 rating but it also says it's recommended for chainsaws and other outdoor power equipment. I figured everybody has been talking about the Schaeffer's oil and was wondering about this stuff. Someone asked me if I wanted a quart they had in their shop because they didn't use 2 cycle oil anymore since they bought their new 4 cycle trimmer

Schaeffers and Royal Purple are both boat oils. The OPE OEM'S say not to use marine oils and for good reason.

 

[jakethesnake]

Schaeffers and Royal Purple are both boat oils. The OPE OEM'S say not to use marine oils and for good reason.

Carbon ?

 

[p61 western]

Schaeffers and Royal Purple are both boat oils. The OPE OEM'S say not to use marine oils and for good reason.

I would like to hear said good reasons.

 

[Deets066]

I wanna see the science /voodoo we speak of.

Troof, 32:1 will make the saw run leaner than 50:1

 

[junkman]

Troof, 32:1 will make the saw run leaner than 50:1

Why so?

Because 32 to 1 is thicker in viscosity so goes through the jets slower put a straw in a milkshake and one in a pepsi ,which one will flow through the straw faster ? Same with mix ,the thicker mix cant get through the jet as fast so it leans out , so another question ? Which burns cooler ? 50 to 1 or 32 to 1 ?

 

[bwalker]

I would like to hear said good reasons.

Its been discussed as to why in this thread in detail.
In a nutshell its because tcw3 marine oils dont work well in air cooled OPE.

 

[bwalker]

Carbon ?

Ring belt deposits are the main issue. Tcw3 oils do not use detergents, because detergant additives are mettalic based. Mettalic based additives lead to plug fouling and pre ignition causing deposits on the nead and crwon when operated in steady throttle and load conditions like a boat motor is.
Instead they use nitrogen based dispersent technology. The problem is dispersent technology isnt effective over a ring belt temp of around 275 degrees. This will lead tonring sticking, excessive wear, etc.
For more info see:
TWO-CYCLE ENGINE LUBRICANTS
David J. Pardo - Director of Technical Services
GOA Company (North Coast Oil, Inc.)
May 1, 1997

 

[andyshine77]

Because 32 to 1 is thicker in viscosity so goes through the jets slower put a straw in a milkshake and one in a pepsi ,which one will flow through the straw faster ? Same with mix ,the thicker mix cant get through the jet as fast so it leans out , so another question ? Which burns cooler ? 50 to 1 or 32 to 1 ?

I have personally seen the opposite, a slight drop in idle and top end rpm. While in theory more oil should mean less fuel, however keep in mind some of the oil does burn and it does change the combustion properties of the fuel. Not sure I buy there will be a discernible difference in viscosity between fuel mixed a 50:1 vs 32:1 that is a stretch IMHO. Now one time I did in fact see an increase in rpm's was with Klotz super techniplate and Maxima 927. Was it the castor? drop in friction? I don't know, but it did have an effect.

 

[Deets066]

I have personally seen the opposite, a slight drop in idle and top end rpm. While in theory more oil should mean less fuel, however keep in mind some of the oil does burn and it does change the combustion properties of the fuel. Not sure I buy there will be a discernible difference in viscosity between fuel mixed a 50:1 vs 32:1 that is a stretch IMHO. Now one time I did in fact see an increase in rpm's was with Klotz super techniplate and Maxima 927. Was it the castor? drop in friction? I don't know, but it did have an effect.

Different people/saws/gas can have different affects

 

[andyshine77]

Different people/saws/gas can have different affects

Correct. Then again I've seen it wither other peoples saws, fuel and oil. I'm just trying to say, not every theory works as it should when applied. A fuels viscosity change between 50:1 and 32:1 will be so minuscule I don't see it having a noticeable effect. Maybe with a super thick oil like R50 in really cold temperatures, but that's still a bit of stretch IMHO. If we were talking say R50 @ 16:1 vs 70:1 we may have something.

 

[bwalker]

I have personally seen the opposite, a slight drop in idle and top end rpm. While in theory more oil should mean less fuel, however keep in mind some of the oil does burn and it does change the combustion properties of the fuel. Not sure I buy there will be a discernible difference in viscosity between fuel mixed a 50:1 vs 32:1 that is a stretch IMHO. Now one time I did in fact see an increase in rpm's was with Klotz super techniplate and Maxima 927. Was it the castor? drop in friction? I don't know, but it did have an effect.

All oils are not the same. Some have negative effects on combustion and some dont.
If your seeing alot of variance in tuning when moving ratios thats a sign that the oil does effect combustion negatively.
When you really think about it the differance in fuel flow when switching from 32 to 50:1 is pretty slight. A ten degree swing in temp would likely have more of an effect on A/F ratio.

 

[Moparmyway]

And thats what I notice more than anything else ............ temps dictate the need to adjust the carb ............ oil ....... not so much

 

[andyshine77]

And thats what I notice more than anything else ............ temps dictate the need to adjust the carb ............ oil ....... not so much

Exactly!

 

[bwalker]

And thats what I notice more than anything else ............ temps dictate the need to adjust the carb ............ oil ....... not so much

This..

 

[junkman]

Has anyone tried the different mix ratios in a saw that tunes out over 15k yet ? In my 440 hybrid it raised the rpm from 15200 to 15800 going from 40 to 1 to 32 to 1 ,oil was amsoil sabre cutting firewood ,i went back to 40 to 1 after the 1.25 gallon can was used up and the rpms went back down to 15200 ,i have a little tach on my saw so i can watch max rpms is only reason i noticed the difference .Different saws could have different results ,lot of variables in this stuff .

 

[junkman]

I have personally seen the opposite, a slight drop in idle and top end rpm. While in theory more oil should mean less fuel, however keep in mind some of the oil does burn and it does change the combustion properties of the fuel. Not sure I buy there will be a discernible difference in viscosity between fuel mixed a 50:1 vs 32:1 that is a stretch IMHO. Now one time I did in fact see an increase in rpm's was with Klotz super techniplate and Maxima 927. Was it the castor? drop in friction? I don't know, but it did have an effect.

The oil must be noticeable ,when i switched from mobil 1 to the saber i dumped the leftover mobil 1 in my lawnmower ,it ran like crap till it was all gone and strait gas again ,i would have never thought the mower would notice some mix in it .

 

[bwalker]

Has anyone tried the different mix ratios in a saw that tunes out over 15k yet ? In my 440 hybrid it raised the rpm from 15200 to 15800 going from 40 to 1 to 32 to 1 ,oil was amsoil sabre cutting firewood ,i went back to 40 to 1 after the 1.25 gallon can was used up and the rpms went back down to 15200 ,i have a little tach on my saw so i can watch max rpms is only reason i noticed the difference .Different saws could have different results ,lot of variables in this stuff .

Yes, quit a bit. Never noticed mich differance with the oils I used.

 

[jakethesnake]

Different oil would throw my ported 346 way all over the place. Drastically