Synthetic 2 stroke oil

[slowrev]

yes I know it lubes better, but since it has a higher flash point will it effect the burning of gas/oil mix in the chamber ?

 

[kenmac]

If anything, should keep the chamber cleaner

 

[Bird]

Of course, my Stihl string trimmer is a 2 cycle engine and the last time I bought 2 cycle oil from my Toro/Stihl dealer, they had gone to selling only synthetic and didn't say anything about it being any different except for a much higher price.

 

[SkyPup]

I use 100% totally synthetic ester two stroke oil in all my ultra high performance racing kart engines, no residue on the rings, piston, or spark plug whatsoever. I just ran one kart ran over 100 mph nonstop for 60 minutes on the Daytona 500 Super Speedway track back at Christmas and checked rings, piston, crank, plug, etc. all spic and span!

http://www.turbolubricants.com/Motul_TECH/Bike engine oil/Kart GP 3030 (GB).pdf

 

[SkyPup]

Here's a link to my helmet cam around the Daytona track >100mph

http://www.phossil.com/thom/Road Atlanta/Daytona/Daytona Sunday 640X480.mov


Can't beat 100% synthetic ester motor oils!

 

[slowrev]

All my 2 stroke engines seem to have lost a bit of power when I went to synthetic oil for the fuel mix.

I know for a fact that the synthetic oil does not burn as well as regualr used motor oil when using it as an accelerant for burning brush piles.


Lube better yes.
Cleaner combustion chamber, probably.

Good answers but no one seems to have addressed my real question.

 

[AlanB]

Well, on a technical standpoint, YES, you would probably need to adjust jetting to compensate for the different oils.

If I was making a guess with the limited information you have provided, I would guess that what I would call the Paul Harvey "rest of the story" is that you probably went from a standard 2 stroke oil, at lets say 32:1 and are now running a full synthetic at say 70:1 (if not the case, my apologies) that change in the ratio and amount will cause a noticable difference in the running of your power equipment. I can see this real clearly (happens fairly often around the crew I run around with) when someone runs bike gas in their chainsaws etc. So if this is the situation you are encountering then yes, I believe you are seeing a difference, but I do not believe it is as much a factor of the flash of the synthetic vs the dino oil, more an effect of the mix ratios.

That said, if you were mixing your standard oils at 50:1 and everything was running fine, then you simply changed to a synthetic at 50:1 and you had running differences I would be very suprised, but not exactly amazed.

One of the constants that I stress to folks when setting up bikes and jetting etc. is that you must keep what you are feeding it as consistent as possible, same fuel, same brand, same mix, same oils, same ratio's etc. there are plenty of variables out there that we cannot control such as air density, altitude, temp etc. but generally, if you get it running correctly on one setting it makes it easy to tune for max performance just altering jetting for the variables beyond my control.

Hope that helps, or maybe just muddies the water more.

Do you have the name of the two oils in particular that you are using / evaluating?

 

[slowrev]

Well, on a technical standpoint, YES, you would probably need to adjust jetting to compensate for the different oils.

If I was making a guess with the limited information you have provided, I would guess that what I would call the Paul Harvey "rest of the story" is that you probably went from a standard 2 stroke oil, at lets say 32:1 and are now running a full synthetic at say 70:1 (if not the case, my apologies) that change in the ratio and amount will cause a noticable difference in the running of your power equipment. I can see this real clearly (happens fairly often around the crew I run around with) when someone runs bike gas in their chainsaws etc. So if this is the situation you are encountering then yes, I believe you are seeing a difference, but I do not believe it is as much a factor of the flash of the synthetic vs the dino oil, more an effect of the mix ratios.

That said, if you were mixing your standard oils at 50:1 and everything was running fine, then you simply changed to a synthetic at 50:1 and you had running differences I would be very suprised, but not exactly amazed.

One of the constants that I stress to folks when setting up bikes and jetting etc. is that you must keep what you are feeding it as consistent as possible, same fuel, same brand, same mix, same oils, same ratio's etc. there are plenty of variables out there that we cannot control such as air density, altitude, temp etc. but generally, if you get it running correctly on one setting it makes it easy to tune for max performance just altering jetting for the variables beyond my control.

Hope that helps, or maybe just muddies the water more.

Do you have the name of the two oils in particular that you are using / evaluating?

You got it. What I did was switch from 32:1 little bottles of reg oil to the same brand of 32:1 synthetic mix oil. 1 bottle per gal of gas per instructions.
They were both from the same 2 stroke engine manufacturer. Who actually made the oil is anyones guess.
I used them up and then went back to regular oil and things ran a bit better. No big difference, but I think I noticed a slight one. ie slightly more power on the dino oil mix than the synthetic one.
Due to a bad back I tend to use the smaller 2 stroke engines which would display the issue more than a larger displacement engine would.
Of course other brands from what I bought may well vary.

I wonder how many revoloutions per gallon our chainsaws get ?

 

[SkyPup]

When I put my 100% pure ester synthetic two stroke 32:1 oil-gas mix for my racing kart motor into any of my eight different 50:1 chainsaws, I have to immediately readjust the carb to keep the chainsaw from over revving due to the major increase in lubrication.

 

[AlanB]

When I put my 100% pure ester synthetic two stroke 32:1 oil-gas mix for my racing kart motor into any of my eight different 50:1 chainsaws, I have to immediately readjust the carb to keep the chainsaw from over revving due to the major increase in lubrication.

Is it the change in lubrication or volatility, or density that makes them run different?

I always beleived it was a function of the combustion / jetting, more then the lubricity that was changing.

Slow, which brand of oil? I am unfamiliar with a full synth running 32:1