661 Oil Test 32:1 vs 40:1 vs 50:1 ?

[Metals406]

25:1

Anything else is just brown water!

 

[porsche965]

The more load that's put on a saw, the hotter it gets. The hotter a saw gets, the leaner it runs. Therefore, more fuel is required to keep it from going lean. At the same time, this additional fuel helps keep the heat down.

That's exactly what I like about the Electronic saws like the 661 and 562. I cut for a Tree Service making firewood for fun and through the loads of wood that come in there are many varying species and degrees of hard. Instead of having to grab the little orange screwdriver the system adjusts for more of less fuel according to how hard the saw is working. Maybe I'm getting lazy as I age but it sure is easy.

I think a failure test would surprise quite a few people just how well their oils stand up to heat and extremes.
Anyone can build a hot rod that tools around town, looks good, sounds cool and shoots some straight lines once in a while. Peg that motor against the red line for an hour, if that, and you will see just how good the builder and oil is.

Yep, starting at the other end of ratios will reveal a lot and a failure is a failure, not speculation.

 

[Trx250r180]

I agree, heavy load makes more power with a richer fuel charge. Just seems silly to me you would adjust carb with different size bars. Reason I say that is because even with a shorter bar I can load the machine just as much as a longer bar but the feed pressure I put on the saw.

Can i ask how large of wood you normally cut ?

 

[Ron660]

View attachment 419195 This is from a bone stock 562 ran on 2R since new.

Because it means your running rich or your blowing oil out the exhaust, which decreases HP. It also leads to buildup on spark screens, etc and makes a mess.

I've used stihl hp ultra at 50:1 and Motul 800 off-road at 32:1 with 93 octane and 110 Sunono fuel. I'll stay with the Motul.

 

[Ron660]

View attachment 419195 This is from a bone stock 562 ran on 2R since new.

Here's another pic of my ported 660. That's clean....yours isn't. Believe me, I've done a few timed cuts to determine performance.

 

[Trx250r180]

Your hardwoods and ours are not the same. Pulling a 24" bar in rock maple with a 75cc saw is less than desirable

I do not think i would like it there if a 75cc saw had to run a 25 inch bar or less ,lol

 

[cuttinties]

I agree, heavy load makes more power with a richer fuel charge. Just seems silly to me you would adjust carb with different size bars. Reason I say that is because even with a shorter bar I can load the machine just as much as a longer bar but the feed pressure I put on the saw.

The guide bar is essentially a lever and the log is the fulcrum.

 

[Ron660]

I do not think i would like it there if a 75cc saw had to run a 25 inch bar or less ,lol

I prefer a ported 90cc saw with a 28" bar buried in Red Oak with square chisel chain.

 

[Marshy]

Can i ask how large of wood you normally cut ?

I don't typically see much over 30". I put a 18" on my 2159, the 365 wears a 20" and the only bar I have for the 285 is a 24". I think it's irrelevant but will play along... Please enlighten me.

 

[Marshy]

The guide bar is essentially a lever and the log is the fulcrum.

 

[Trx250r180]

I don't typically see much over 30". I put a 18" on my 2159, the 365 wears a 20" and the only bar I have for the 285 is a 24". I think it's irrelevant but will play along... Please enlighten me.

Try out a 32 some time ,make one pass in the 30 inch log ,and let me know how the saw pulls ,or if it leans out on you at all from the extra load from your settings with the 20 inch bar .

 

[Marshy]

Try out a 32 some time ,make one pass in the 30 inch log ,and let me know how the saw pulls ,or if it leans out on you at all from the extra load from your settings with the 20 inch bar .

I think I can achieve the same loading with the 20" with more pressure. I think I'll just tune the saw once loaded in the cut and call it done. The F/A ratio doesnt change with the load being applied.

 

[Mastermind]

I'm running a ported 046 with an 18" .325 9 pin this weekend.

Is that a problem?

 

[Trx250r180]

I think I can achieve the same loading with the 20" with more pressure. I think I'll just tune the saw once loaded in the cut and call it done. The F/A ratio doesnt change with the load being applied.

Seems like a regional thing on bar sizes and uses ,same thing with the handlebars ,you would most likely not like my wrap handles either .

 

[Trx250r180]

I'm running a ported 046 with an 18" .325 9 pin this weekend.

Is that a problem?

What kind of oil are you going to use ?

 

[Marshy]

Seems like a regional thing on bar sizes and uses ,same thing with the handlebars ,you would most likely not like my wrap handles either .

I have a saw with a wrap, have no problems with it. I think you guys are beyond the point of deminishing return and might be an outlier with some of your practices and your reasoning. Carry on.

 

[cuttinties]

I have a saw with a wrap, have no problems with it. I think you guys are beyond the point of deminishing return and might be an outlier with some of your practices and your reasoning. Carry on.

Cool story

 

[bwalker]

I prefer a ported 90cc saw with a 28" bar buried in Red Oak with square chisel chain.

A common setup around here is a 385 or a 390 with a 20" bar. Sugar Maple is hard and our growing season very short so the wood is very dense. To give some reference we still have more than a foot of snow in the woods so the trees won't start growing for the season for awhile yet.

 

[Mastermind]

What kind of oil are you going to use ?

Tractor Supply 20-50W

 

[blsnelling]

I really think you should use SAE30 Non-Detergent.