Mixing 2 cycle oil

Rkh

Member
My chain saw calls for 50-1 ratio(2.6 ounces oil to 1 gallon gas). Is 2.6 fluid
ounces equal to if you weight 2.6 ounces on a weight scale?
 
Rkh,

That is a liquid measure. Different weight for different liquids same liquid measure,

Guido.
 

Put a gallon of gas in a 1.25 gallon gas container, and measure in just a tiny bit over 5 liquid ounces of oil and call it good. Not too much or you will get sticking rings. If you don't use a gallon in a season put the remainder in you car, or if you use a lot more mix five gallons. When the carb goes bad get a cordless saw.
 
(quoted from post at 10:00:45 05/09/22) My chain saw calls for 50-1 ratio(2.6 ounces oil to 1 gallon gas). Is 2.6 fluid
ounces equal to if you weight 2.6 ounces on a weight scale?


Not quite, because the weight of a fluid once of water measured by volume is slightly more than the weight of a fluid ounce of oil measured by volume.

The "fluid once" volume measurement is based on water.
 
Darned Imperial measurement system anyways. Gallons are bad enough, add ounces into the mix and then fluid ounces in some cases and weight ounces in others .... enough to make a guy drink some of what you mix up. Metric is soooooooo easy, so in a litre of fuel (1000 mL) add 20mL of your oil (20 x 50 = 1000). In a US gallon (about 4 litres or 4000 mL) add 80 mL of oil.
 
Get yourself a $1 set of measuring cups from the dollar store for your shop or steal the extra set from the cardboard box of unused kitchen utensils in your attic/basement. 1/3 of a cup is 2.7 fluid ounces.
 
These are around $4-$5. It is a measuring cup just for this.
cvphoto125390.jpg
 
That's is why I buy the little bottles of Husky oil and I have been mixing it with REC gas. I write the date mixed on the can. When dad was logging they would burn up to 8 gallon per day of 16 to 1 in the old Homelites.
 
In the 60's I had a ski boat with a 75 hp evinrude.
One quart to 6 gallons. We could easily go through 18 gallons in a day. Had to use high octane to make good hp. I think this was before ethanol.

It got expensive after OPEC jacked up prices. Sold the boat in 1977. It was a money pit..Never buy another boat.
 
(quoted from post at 19:16:38 05/09/22) These are around $4-$5. It is a measuring cup just for this.
<img src=https://www.yesterdaystractors.com/cvphotos/cvphoto125390.jpg>

I've used a ratio-rite for years for 2 strokes. Bought it for the Banshee but handy for any 2 cycle.
 
I use the ratio rite cup also. It works really well for taking a fuel sample and checking for dirt and water.
 
Showcrop, he said his saw calls for 50-1, and your telling him to mix it about 25-1, why? That much oil
will cause way more problems than it solves, and a lot of smoke!
 
I would buy one of the 2.6 oz bottles of mix oil, make a Sharpie mark on the bottle where it is filled to before using it, and then fill it every time to the mark, to mix your gallon of saw gas. The little bottles hold about 4 oz, so don't fill it full. A little more than 2.6 will not hurt the saw. I've done it this way for way more years than I want to admit, and never, ever blown up a saw - not even one of my old XL-12's. steve
 
Simple way: Go to gas station with non-Eth gas. Use a 1 gal or a 2 gal fuel can. Pour in all of the 2.6 Oz little bottle. Fill to 0.81 gal of non-Eth gas. The measuring by the gas pump will be very accurate, it is tested by the state weights and measures each 4 months(or so). It is also easier to pour with only .8 gal in a 1 gal container.

You now have a perfect safe 40:1 mix ratio.

For 2 gal mixed, put in two of the 2.6 Oz bottles, and add 1.62 gal of non-Eth. However, I recommend just one gal at a time, as pre-mix fuel does have a shelf life. Unless the two stroke uses a lot of fuel, and doing a lot of work, one gal at a time is plenty.

40:1 will work in ALL modern two strokes. It will not gum the carb, and it will smoke just a little bit under full load, and when first started. A little two stroke smoke is a good thing.
 
(quoted from post at 19:09:13 05/09/22) Showcrop, he said his saw calls for 50-1, and your telling him to mix it about 25-1, why? That much oil
will cause way more problems than it solves, and a lot of smoke!



Russ, you are right. I don't know why I posted 5 oz. but I do remember that I got distracted while typing the post and had to leave and come back.
 
I run Stihl chainsaw oil in everything go to your local dealer and pick up the convenient packs that mix with 1 gallon or 2 1/2 gallon or something like that.
All I have chainsaws leaf blowers And weed eaters I do not buy anything else but that oil to run of my two cycle equipment. An old boy back 30 years ago At a dealership so go ahead and run that 50-1 using stihl oil in that old Homelite saw so we did no problems. That saw was 25 to 1 no problems cut a lot of wood.
 
I'd like to know where you can get these at $4 to $5. I looked around locally and got the old deer in the headlights when I asked for one. Found some online, but more like $8 to $10 plus shipping.

If I could find them for a reasonable price, I would keep 2 or 3 around.
 
(quoted from post at 10:49:41 05/09/22) Darned Imperial measurement system anyways. Gallons are bad enough, add ounces into the mix .
Imperial system is pretty simple to me. 32 ounces of gas to 1 ounce of oil and there you go. Multiply by whatever amount you need. Of course I am that guy that grew up with the imperial system and was forced to learn the metric measures in later years.
 
To answer your question, No. A fluid ounce is a measure of capacity (size) not a measure of weight.
 
Unless you use an awful lot of gas in things 2cycle. The Stihl oil is about as easy as it gets and not going to make a big difference in cost if you figure the big picture. You will spend more on Candy than you do for the oil in a years time. You can get the Stihl oil for gallon,2.5 gallon and 5 gallon size. The size that is just right for you. I buy the 2.5 gallon size so it fits the jug then fill with gas after pouring in oil and rinsing the bottle a few times. DO it this way for 30 years with no issues. As for the octane thing was not the higher octane for reducing spark knock in cars with higher compression ratios? So I don't see how that Works for mo HP when you are trying to delay a compression ignition problem. It's not like changing the Cetane in diesel fuel.
 
(quoted from post at 19:59:02 05/10/22) To answer your question, No. A fluid ounce is a measure of capacity (size) not a measure of weight.

Yes, and I count five answers to the question prior to your answer.
 
(quoted from post at 22:17:43 05/10/22)
(quoted from post at 10:49:41 05/09/22) Darned Imperial measurement system anyways. Gallons are bad enough, add ounces into the mix .
Imperial system is pretty simple to me. 32 ounces of gas to 1 ounce of oil and there you go. Multiply by whatever amount you need. Of course I am that guy that grew up with the imperial system and was forced to learn the metric measures in later years.

I find it ironic that the system that developed over the years by uneducated and illiterate people who had to rely entirely on their memories is too hard to manage in an age when everyone went to school and most people carry a combination calculator/magic crystal ball in their pockets.
 

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