Premix 101: Oils, Ratios, and Fuel

[bitzer]

I do cut & sawmill timber for a living, time yourself for a tank of fuel WOT & you will discover why you're over estimating.
ta

Why does it have to be wot? Last time I checked hours on a machine are the time its running. My hour meter clicks over on my skidder if its idleing or running wide open.

Its definetely not more fuel efficient with the holes i have in the exhaust.

 

[Westboastfaller]

Just goin

I do cut & sawmill timber for a living, time yourself for a tank of fuel WOT & you will discover why you're over estimating.
ta

well that's going to be far from accurate anyway you said running time. And when is he going to be holding his saw at WOT for more that a few min.

*EDIT
(That's what I was writing...funny)

 

[Deleted member 83629]

Theres a tremendous amount of arrogance surrounding oils. I.e. You are stupid if you dont run 32:1 or 40:1. Ive said it 1000 times, run a sensible ratio for your application period. I dont understand the cult mentality of the ultra rich mix ratios. Not saying i run 80:1 in my saws ( i do in my backpack blower that is approaching the 300 hr compliance period and piston looks brand new....) but im not out namecallling. Time for people to grow up a little bit.

guess im stupid then.

 

[Westboastfaller]

I suppose everyone has a different idea
on what a work saw could be, or better said; what a work saw can't be.

 

[Bwildered]

Why does it have to be wot? Last time I checked hours on a machine are the time its running. My hour meter clicks over on my skidder if its idleing or running wide open.

Its definetely not more fuel efficient with the holes i have in the exhaust.

its was the norm for engine manufacturers to measure engine hours at full operating revolutions because components will only rotate or occilate so manys time before they fail or wear out at "x" hours, as you say some engines measure it electronically once the engine is running no matter what the revs, its a more realistic idea of how much work a engine has done which is based on revs, MACK & several other manufactures such as my sawmill with an electronic system use this system. I had no idea how long it took to drain a tank of fuel until I was bored on day ripping posts for a big order & timed some tanks, try it it may surprise you. I wouldnt consider any engine idling doing any measurable work & if that was the case then it would be doing triple the work at working revs.
ta

 

[joe25DA]

I run everything at between 32:1 and 40:1. All the saws, brush cutters, hedge trimmers , weedwackers, 2 lawnmowers, leaf blowers. They all run happy

 

[Deleted member 83629]

i mix a quart of 15w40 with 5 gallons of gas because i care for the enviroment.

 

[jmssaws]

I tear down dozens of saws a year that live in terrible conditions and for the most part there run on stihl oil at 50to1 and there dry as a bone inside, how they last like they do is a testament to the engineering involved, that said I believe most that are seized could be prevented by simply shaking there gas can before they fuel. But we've all cn the gas can in the back of the truck in the rain with a sparkplug or a stick for a plug.

 

[hardpan]

Brad
Great thread. I confess my ignorance of the "pool" function of residual oil typically found in the case of 2 strokes. Many folks switch oil when looking for a better performer, me too. I wonder about the compatibility when mixing oils of different types and manufacturers. I used to have a job lubricating large electric motors and the manufacturers stressed to never add a non specified grease as it would mix with the existing lube, foul the lubricating potential, and be terminal to the motor bearings. We considered 20HP and smaller as throw-away motors but still never broke that rule. Of course we can't just stick with one oil in our saws. Then we couldn't have oil threads and I like em.. LOL

 

[bitzer]

its was the norm for engine manufacturers to measure engine hours at full operating revolutions because components will only rotate or occilate so manys time before they fail or wear out at "x" hours, as you say some engines measure it electronically once the engine is running no matter what the revs, its a more realistic idea of how much work a engine has done which is based on revs, MACK & several other manufactures such as my sawmill with an electronic system use this system. I had no idea how long it took to drain a tank of fuel until I was bored on day ripping posts for a big order & timed some tanks, try it it may surprise you. I wouldnt consider any engine idling doing any measurable work & if that was the case then it would be doing triple the work at working revs.
ta

Idle or no its still wear and tear. My saws would last a lot longer if they wore out only at wot. You're an odd duck to point out such a moot point. My 25 year old skiddrer should only have a couple thousand hours on it then. That will be a hot selling point. Might be tough to convince the buyer of that tho. In big timber I refuel every twenty minutes.

 

[Bwildered]

I tear down dozens of saws a year that live in terrible conditions and for the most part there run on stihl oil at 50to1 and there dry as a bone inside, how they last like they do is a testament to the engineering involved, that said I believe most that are seized could be prevented by simply shaking there gas can before they fuel. But we've all cn the gas can in the back of the truck in the rain with a sparkplug or a stick for a plug.

these days a little oil goes a long way, like it's designed to do.
ta

 

[Bwildered]

Idle or no its still wear and tear. My saws would last a lot longer if they wore out only at wot. You're an odd duck to point out such a moot point. My 25 year old skiddrer should only have a couple thousand hours on it then. That will be a hot selling point. Might be tough to convince the buyer of that tho. In big timber I refuel every twenty minutes.

some guys should be able to get 10,000 hrs out of their saws then!
thansk

 

[bitzer]

some guys should be able to get 10,000 hrs out of their saws then!
thansk

Too bad everything around the engine rattles apart and wears out. It pisses me off when you pay a grand for something. The engine is fine, but the rest is barely hanging together by the end of the year. No longer a production saw. Tax write off I guess. Now about swinging trees 180 degrees from the lean...

 

[bwalker]

Idle or no its still wear and tear. My saws would last a lot longer if they wore out only at wot. You're an odd duck to point out such a moot point. My 25 year old skiddrer should only have a couple thousand hours on it then. That will be a hot selling point. Might be tough to convince the buyer of that tho. In big timber I refuel every twenty minutes.

Idling is harder on most engines than running full out.

 

[SCHallenger]

I think I should "tune in" here.

 

[Bwildered]

Idling is harder on most engines than running full out.

yes constant idling, underloading or overloading can shorten the life of an engine.

 

[bitzer]

yes constant idling, underloading or overloading can shorten the life of an engine.

Then why doesn't that count as hours on the saw? From your perspective, not a manufacturers please.

 

[Bwildered]

Then why doesn't that count as hours on the saw? From your perspective, not a manufacturers please.

it does count, intermittent idling wont shorten the life of your saw greatly, it will exaggerate your hours that you think its working though. if your saw is idling for say 5 minutes a tank, thats almost 50% added to the time the saw really isnt working.
thansk

 

[bitzer]

it does count, intermittent idling wont shorten the life of your saw greatly, it will exaggerate your hours that you think its working though. if your saw is idling for say 5 minutes a tank, thats almost 50% added to the time the saw really isnt working.
thansk

So you must put about 30 hours on the saw a year then huh?

 

[Bwildered]

So you must put about 30 hours on the saw a year then huh?

If i could find it in the shed under the cobwebs! LOL. If I only did 30 hrs a year & thought it wasn't manly enough I can always triple the hrs to include idling time
one of these removes most of the guess work

• Tiny Tach TT2A Digital Hour Meter / Tachometer - Adjustable Resettable Job Timer

thansk