Is compression king?

[exSW]

Maths hurt my heads.

Me too! Especially on Sunday morning.

 

[Mastermind]

I'm hurting real bad again. I think I might have more wrong than a torn groin muscle. I reckon I will be signing up for Obamacare in November to get this fixed. I feel like I'm being raped by the system, but it is what it is.

 

[exSW]

I'm hurting real bad again. I think I might have more wrong than a torn groin muscle. I reckon I will be signing up for Obamacare in November to get this fixed. I feel like I'm being raped by the system, but it is what it is.

I'm curious to learn how this works for the self employed. Don't you guys still have some version of TennCare?

 

[Deets066]

Have not read all the posts, don't have the time, but there was some discussion about fuel octane. Stihl recommends higher octane because it runs cooler, so I always run high test (93 octane around here).

Ethanol free is not available here, but I always mix my gas soon after I get it, and never leave a saw not run for too long, and I have not had any problems. Even my weed wacker, which goes for many months in the winter w/o use, is doing fine.

I've always seen Stihl recommend (in the operator manuals) mid grade fuel 89.

It also says Stihl oil at 50:1
And all other oil at 25:1

 

[Red97]

Maths hurt my heads.

Yep it doo

 

[Mastermind]

I'm curious to learn how this works for the self employed. Don't you guys still have some version of TennCare?

The powers that be here in Tennessee sided with the insurance companies. They have cut back Medicare rather than expanding it. If you have a pre-existing condition, well, Obamacare is your only option.

 

[Magnumitis]

Ok, I just mathed the heck outta this stuff. Smell the smoke...

I believe I found a simple solution (calculator's) for figuring area on concentric circles, centered chamber in a bore.

50mm bore, radius 25mm.

3.14x25x25= 1962 (area)
1962×.5= 981. That is the area I need for 50% squish band.

Now using a online annulus calculator. Aka ring or in our case "squish band"

With a known bore size I can adjust the area of the band to determine the correct diameter for the chamber.

Which happens to be a 7.3 mm band or 35.3 mm chamber for a 50mm bore to get a 50% squish band area.

Only reason I bothers to show the work is so I can come back to remember what the eff I was talking bout.

...and remember as a rule of thumb, doubling the diameter of the cylinder quadruples the volume.

[emoji12]

 

[jmssaws]

The powers that be here in Tennessee sided with the insurance companies. They have cut back Medicare rather than expanding it. If you have a pre-existing condition, well, Obamacare is your only option.

It's the only option for me and I'm thankful for it.

 

[Red97]

...and remember as a rule of thumb, doubling the diameter of the cylinder quadruples the volume.

[emoji12]

Oh.. maybe volume will be tonight's lesson......

 

[MustangMike]

I've always seen Stihl recommend (in the operator manuals) mid grade fuel 89.

It also says Stihl oil at 50:1
And all other oil at 25:1

Yes, you are correct, but the reason they do not recommend 87 octane is that 89 runs cooler (higher octane runs cooler), and that is in a stock saw. None of my saws have managed to remain stock and running 40:1 (instead of 50:1) reduces the octane further, so I go with 93 to try and remain safe. (Buying mid grade is always a rip off anyway, you would be better off buying 1/2 regular and 1/2 high test).

The local tree guy followed all of Stihls recommendations (except the octane), and his 660 came to me with a heat failure (scoring on the exhaust side). It will go back to him with a dp cover and the limiters removed. He is also now running high test and 40:1. I hope his saws have a "good run" going forward.

 

[jmssaws]

Mid grade is premium and regular mixed.

I have seen many saws dead from fuel but not because of octane,there dead from the gas can that never leaves the back of the truck and has a stick/spark plug for a cap.

Little water in your gas is death.
Most never completely empty there can and just keep putting more in on the old.

I get a 441 that is seized from a tank of gas and water,I tell him why and he asked how the water got in there,I said you dumped it in there. He set his can out of the truck and in a few hours you could see the line between gas and water.

 

[Nitehawk55]

The powers that be here in Tennessee sided with the insurance companies. They have cut back Medicare rather than expanding it. If you have a pre-existing condition, well, Obamacare is your only option.

Come on up to Ontario , we'll fix you up for free !

I have family and friends in the US , it's a shame you don't have a proper health care system .

 

[Mastermind]

It's the only option for me and I'm thankful for it.

Come on up to Ontario , we'll fix you up for free !

I have family and friends in the US , it's a shame you don't have a proper health care system .

I'll be applying on Nov 1st. I've always just paid as I went.......and sometimes that was pretty damn costly.

I'm getting to old to count on being able to do that.....so I'll give in....

Enough about this *B-S...........I'm in pain, and grumpy today. LMAO

 

[mdavlee]

I'm still using 87 in all of them. The 220 lbs of compression ones don't diesel on it so I'll keep running fresh fuel. I may grab some 90 marine gas since it's probably a little fresher still. Lots of fishing goes on near me.

 

[Stihlbro]

@Mastermind, I believe @Stihlbro is making fun of your legs, again.......

Hahaha! Not what I was thinking. But I see what you did...

 

[Mastermind]

I'm used to being kicked around......

 

[RI Chevy]

Hope your feeling better soon. Sorry to hear your hurting.

 

[paragonbuilder]

It's the only option for me and I'm thankful for it.

Same here...


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[paragonbuilder]

Yes, you are correct, but the reason they do not recommend 87 octane is that 89 runs cooler (higher octane runs cooler), and that is in a stock saw. None of my saws have managed to remain stock and running 40:1 (instead of 50:1) reduces the octane further, so I go with 93 to try and remain safe. (Buying mid grade is always a rip off anyway, you would be better off buying 1/2 regular and 1/2 high test).

The local tree guy followed all of Stihls recommendations (except the octane), and his 660 came to me with a heat failure (scoring on the exhaust side). It will go back to him with a dp cover and the limiters removed. He is also now running high test and 40:1. I hope his saws have a "good run" going forward.

Mike I would be willing to bet it has nothing to do with the fuel. I bet he was running it hard with a dull chain. Happen twice to my dad loaning out his saws. He provided the mix for them to use and he uses 91 octane.


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[Stump Shot]

I'm used to being kicked around......

Then you'll fit right in with the Obamacare system. I say this to you just for your personal knowledge before going in. Numerous folks I know in this system that have used it and subsequently had their tax status change, saw gigantic(some crushingly so) increases afterwards. Not telling you what to do one way or another, but thought you should know is all. What you do with this information is purely up to you as well, if ya know what I'm a saying here.