What oil is best? and what ratio?

[Kozak Logging]

I will explain what ethanol does if left in a machine. Nobody is perfect. I just tore down a 85 honda trx 250 four wheeler. the sediment bowl was full of grey powder as well as the carb bowl. Its nasty thats why most ppl use a premium cuz thats the only fuel left thats ethanol free in my area atleast.

 

[Moparmyway]

That fuel wouldn't be my first choice, nor my 2nd. VP c-12 is a good fuel for a two stroke.

VP SEF is up there also, for 2 strokes or 4 strokes. Less octane than C12

 

[Brian Simonseth]

That fuel wouldn't be my first choice, nor my 2nd. VP c-12 is a good fuel for a two stroke.

This is only the third 5 gallon bucket that I've used of the MS98L; I've been a photog for racing and that's what alot of those guys been using because of the octane

I don't know if the higher octane fuel would do to the saw's

One thing I did want was leaded fuel so the saw's would run cooler

I will talk with there rep before I get my next 5 gallon bucket of fuel

I try to learn more every day

 

[junkman]

Heat builds power, too cool can have a negative effect in power , running cool and letting the heat out with exhaust mods are two different things.

 

[Canadian farm boy]

The higher the octane the slower and cooler it burns. 87 vs 93.
The 87 has a much hotter bang and burns faster. Thus it's more violent. This is why with an engine that has a lot of ignition timing and higher compression you can get detonation and also overheat a piston or cylinder. IMO an engine with normal ignition and compression was well as a shorter stroke will actually work better with 87.

The 93 has a cooler bang and burns slower. Not as violent. So an engine with a lot of ignition timing and compression needs the higher octane. To help prevent the detonation. IMO an engine with advanced ignition, higher compression and a longer stroke definitely benefit.
Every engine is different. They all prefer something different. It's all in how the engine is built, what its built for and how long you want it to last and preform.
I think this is why some guys say that 87 works better in there saws and some guy say 93.
To much octane can slow a saw down and not enough octane can cause damage. It's all about figuring out what works best for you.

The mix oil also effects things with the different flash points etc. I don't know enough about oils yet to really have much input here but the way I see it is like this. Lower octane needs higher flash point and higher octane can have a lower flash point.

This is just my $.02. I may be way off but this is how I see things when talking about fuel. Carry on

 

[mdavlee]

If I can get time I'll try the 87 and 94 in the pine cants with the 346 or 562. They were 3 second range and the 7900 was in the 1.1 with a decent chain.

 

[Canadian farm boy]

I'll bet you see a real difference. Especially in a modded saw. I'd really like to hear about your results.

 

[mdavlee]

I'll bet you see a real difference. Especially in a modded saw. I'd really like to hear about your results.

Every time I went down in octane they got faster. Heck I may go do it now. Its not snowing and 36.

 

[Brian Simonseth]

I'll try it like I said I'm still learning at the age of 54

 

[Keith Gandy]

Every time I went down in octane they got faster. Heck I may go do it now. Its not snowing and 36.

Oh ya!! Im sittin on this d9 for the next 8hrs waitin on results!!! Lol!!

 

[KenJax Tree]

Try VP T4 its about $60 for 5 gallons
http://www.vpracingfuels.com/blogs/...-introduces-unleaded----t4----for-powersports


#patheticbuddies

 

[Canadian farm boy]

It would also be interesting to see what happens with the tuneing of the carb with the different octanes. More fuel or less fuel depending on the octane?
Idles higher or lower?

 

[mdavlee]

Been running this fast 7900 on VP 94. I drained it out and refilled with dumonde and 87. I have hp2 and 87 as well.

 

[mdavlee]

Video is uploading. Had 2 cuts under 1.1 and then 2 right above 1.1. Didn't really change anything on that saw. The L was a tiny bit lean on the 87 compared to 94.

 

[jmssaws]

If she was a tiny bit lean on 87 I bet she was fast on 87 too.

 

[Canadian farm boy]

I believe with the higher octane you can use more fuel. The combustion is slower( burns longer ) the more fuel the longer it takes for a complete burn thus it pushes the piston longer but not quite as hard
I look at 87 octane like punch and 93 as more of a hard push.

 

[mdavlee]

87 dumonde

 

[mdavlee]

VP 94

 

[mdavlee]

I guess I could dump this fuel and try the 87 and hp2. Someone with a good connection and stop watch time them.

 

[wildroamer]

You guys should start an octane thread, or some such, IMO! This is one of those beastly long threads that has morphed into some pretty awesome back and forth for the jv team such as myself to enjoy/learn from. But sheesh, you see a thread with this moniker, and then see 45 pages, zoiks!