More reason to run higher oil to fuel ratio?

[walexa07]

Just thinking out loud here:

With the strato saws using much less fuel per amount of work done, that means they are also using much less oil (in the fuel).

I know the oil threads get old, just throwing a new twist out there to think about. Sorry if this has been put out there before.

Waylan

 

[Beer Gut]

Using less fuel wouldn't matter the ratio would stay the same its in the mix..

 

[Somesawguy]

That's an interesting thought. I'm sure they've considered that, but a little extra oil might not hurt. I tend to run closer to 40:1 with my fuel anyway.

 

[walexa07]

Using less fuel wouldn't matter the ratio would stay the same its in the mix..

Same ratio, but if you only burned 1 gallon of premix for a day's worth of cutting with the strato saw, and 2 gallons with the non strato saw, the non strato saw got twice as much oil to its bearings, etc.

Waylan

 

[blsnelling]

I have to say no. I ported a 441 that had been used a lot to mill with. It's limiter caps still intact. I believe it had also never seen more than 50:1. You could see that it had been hot, but no damage what so ever.

 

[Kenskip1]

Excellent point of view my dear Waylan! Just when we think we know about oil mix ratios and the like, then a smart guy tosses this bit of information into the ring.I really see your point on this. I just never thought about it.Great thread.But boy is Andy gonna be pissed!Ken

 

[Ray Bennett]

A little extra will never hurt but its a fine line. People always argue this but try it your self. Run 32 to 1 in a new saw and take the temp of the muffler, many times it will be higher with more oil cause the saw is getting less fuel. I actually know two guys that have blown saws from too much oil. I fix this buy using a little extra oil and richening up the carb setting. Then you are getting more oil and fuel.

 

[jimdad07]

I would think that 40:1 would still be ok in the strato saws. I would rather see more lubrication and stay on the safe side myself. I am interested in seeing what the others have to say on this. Good twist indeed.

 

[Beer Gut]

Out load here but same ratio mix same RPM's but less fuel combustion so less heat so less friction right?

 

[Fifelaker]

I have always heard that more oil=a leaner mixture is this correct.

 

[splitpost]

This should be good

 

[GA_Boy]

Wow, there sure seems to be a lot of unnecessary over thinking going on lately.

If the strato saw used less MIX that doesn't mean the internal components saw less oil. It just used less MIX at whatever ratio you are running (50:1, 40:1, etc).

Using less fuel wouldn't matter the ratio would stay the same its in the mix..

Exactly!

Same ratio, but if you only burned 1 gallon of premix for a day's worth of cutting with the strato saw, and 2 gallons with the non strato saw, the non strato saw got twice as much oil to its bearings, etc.

Waylan

Wrong, the non strat just burned twice as much fuel at the same ratio.
The only way the strat would get twice as much oil would be to use 25:1 and 50:1 for the non-strat.

 

[Beer Gut]

This should be good

HA:hmm3grin2orange:

 

[3000 FPS]

Just thinking out loud here:

With the strato saws using much less fuel per amount of work done, that means they are also using much less oil (in the fuel).

I know the oil threads get old, just throwing a new twist out there to think about. Sorry if this has been put out there before.

Waylan

That is an interesting point but if the strato saw uses less fuel then it is more lean. Then putting more oil in would that make it even more lean? If you want more oil why not richen the mixture instead of adding more oil. Then the saw would have more oil because of a rich mixture. I am by now means any expert in this and just throwing out another thought.

 

[splitpost]

fuel /oil ratio is different to air/fuel ratio,most engines will tollerate varied oil/fuel ratios ,but get the air fuel ratio (Stoichiometric ratio ,Adjustable at the carb)wrong and an engine wont like for long

 

[openloop]

The reason strato engines use less fuel in because its not wasted by blowing it out of the exhaust....If mix is making it out of the exhaust it hasnt done anything in the engine, including effective top end lubrication.

 

[dingeryote]

Stratos burn less fuel because thier carbs flow less mix, I.E. run on less fuel/oil. In effect OP is correct.

Less fuel/oil is reaching the bearings for the same amount of time, under the same load, making similar or more power.
Which is why the Stratos make the Hippies and EPA smile in the first place....fewer emissions.

If the volume of mix/oil getting to the bearings was similar, fuel consumption would be similar, and it is not. Stratos sip.

With all things oil related, it is a matter of engineering the bearings to do the things they do.
Coatings, alloys, dimensional considerations and that sort of thing. I also have to suspect that modern 2cycle oils and thier superior propertys come into play as well.

On an older saw, you will fry a piston long before a bearing gets roached, if the carb is set as lean as some of the Stratos run normally.
I forget who it was here, that recently discovered he had been running near 100:1 with Ultra. Hmmmm...

Stay safe!
Dingeryote

 

[fearofpavement]

Read the manual.

Well, what does the owner's manual say regarding this? I assume they would've had some input from the designers and developers of the saw. If they are warrantying the saw, I expect they would make recommendations leading to longevity.

 

[Stumpys Customs]

The extra fresh unfuled air that enters the saw never see's the crank case. So the oil/fuel ratio to the crank case & rings is still the same as any other saw. Or at least the stratto designs that I've seen.
Watch the video it shows better than I can explain.
[video=youtube_share;IY7zQKw4qsQ]http://youtu.be/IY7zQKw4qsQ[/video]
[video=youtube_share;ycaWg8bz93o]http://youtu.be/ycaWg8bz93o[/video]

 

[dingeryote]

The extra fresh unfuled air that enters the saw never see's the crank case. So the oil/fuel ratio to the crank case & rings is still the same as any other saw. Or at least the stratto designs that I've seen.
Watch the video it shows better than I can explain.
[video=youtube_share;IY7zQKw4qsQ]http://youtu.be/IY7zQKw4qsQ[/video]
[video=youtube_share;ycaWg8bz93o]http://youtu.be/ycaWg8bz93o[/video]

Yep!

The question is, are the stratos running on less fuel/oil volume for the same amount of work/time as an equivalent older design.

Say 361 vs 362.

Should be easy to check. Main jet size on each should tell the tale.
Anybody know off hand?

Stay safe!
Dingeryote