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post #1 of 36 Old 06-06-2018, 12:41 PM Thread Starter
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Fuel Mixture: Is 25:1 and 32:1 Really Necessary?

I have old OPE. A Homelite saw that's around 25:1. A Lawnboy walk-behind that's 32:1. All the other stuff is 50:1. The old stuff was manufactured before the 50:1 premix became available. Is it really necessary to have all these mixtures hanging around? It's really a bit of a pain. Is the oil in the 50:1 premix good enough to work in OPE requiring 25:1? What do the real experts say? Thanks in advance. Hot Ajax

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post #2 of 36 Old 06-06-2018, 02:16 PM
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Re: Fuel Mixture: Is 25:1 and 32:1 Really Necessary?

Modern universal mixture oils are refined to lubricate extremely well, even at 50:1 mixture ratio. Try a good oil like echo power blend or stihl HP ultra mixed at 50:1 in your older equipment and see if it runs normally, and does not overheat. I use the stihl in everything, most is 50:1, but I have a small cultivator that is 40:1 and it runs great, does not overheat.
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post #3 of 36 Old 06-06-2018, 03:05 PM Thread Starter
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Re: Fuel Mixture: Is 25:1 and 32:1 Really Necessary?

Thanks, Rob. Leave it to a PA guy to help out. Hot Ajax

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post #4 of 36 Old 06-06-2018, 04:19 PM
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Quote:
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I have old OPE. A Homelite saw that's around 25:1. A Lawnboy walk-behind that's 32:1. All the other stuff is 50:1. The old stuff was manufactured before the 50:1 premix became available. Is it really necessary to have all these mixtures hanging around? It's really a bit of a pain. Is the oil in the 50:1 premix good enough to work in OPE requiring 25:1? What do the real experts say? Thanks in advance. Hot Ajax
That's a huge jump in ratio. I'd be very very careful if it was mine
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post #5 of 36 Old 06-06-2018, 05:33 PM
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Re: Fuel Mixture: Is 25:1 and 32:1 Really Necessary?

I bought a earth auger from Harbor Freight...2 stroke......and used my 50-1 Husky mix in it......burnt it out.....the directions...that I never read.....specified 16-1. I bought a replacement...used 16-1 and it's been fine for years.
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post #6 of 36 Old 06-06-2018, 06:29 PM
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Re: Fuel Mixture: Is 25:1 and 32:1 Really Necessary?

If it requires 25:1 then mix 25:1, if 32:1 then that, if 50:1 then that. Don't use 50:1 in old units even though they run at half the rpm of the newer stuff or you will lock it up. I serviced and sold Homelite & Stihl equipment for years and although the old slower Homelites were far more forgiving than the high revving Stihls but still saw a fair share of locked up engines in both from folks mixing the wrong ratio, just saying. Good luck.

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post #7 of 36 Old 09-27-2018, 05:18 PM Thread Starter
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Re: Fuel Mixture: Is 25:1 and 32:1 Really Necessary?

Quote:
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I bought a earth auger from Harbor Freight...2 stroke......and used my 50-1 Husky mix in it......burnt it out.....the directions...that I never read.....specified 16-1. I bought a replacement...used 16-1 and it's been fine for years.
Cranman: When it comes to Harbor Freight, you never know if they forgot something important, like rings for example.

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post #8 of 36 Old 09-27-2018, 05:40 PM
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Re: Fuel Mixture: Is 25:1 and 32:1 Really Necessary?

Use only the mixture recommended by the engine manufacture.... its not just about oiling the engine.... changing the fuel ratio also effects the compression in the combustion chamber.

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post #9 of 36 Old 09-28-2018, 06:20 AM
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Re: Fuel Mixture: Is 25:1 and 32:1 Really Necessary?

the modern oils are a lot better, but there are other things that come into play with these.. I normaly like to be at least close.. I have a saw that says 32:1 and I have zero issues running the 40:1 premix in it. I save the 50:1 for the modern stuff. I don't run anything older that uses the heaver oil % in them, so I cant speak, but no way I would run 40, or 50:1 in a old 16:1 motor.

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post #10 of 36 Old 09-28-2018, 07:46 AM
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Re: Fuel Mixture: Is 25:1 and 32:1 Really Necessary?

Did you guys notice I suggested he use and monitor the equipment in the initial use? If it seems hotter than normal, squirt half an ounce in the tank.
Oil mixing isn't the rocket science it's often made out to be.
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post #11 of 36 Old 09-28-2018, 08:20 AM
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Re: Fuel Mixture: Is 25:1 and 32:1 Really Necessary?

I agree synthetic modern oils are very good, however I still run 40:1 with synthetic in saws calling for 50:1. A little extra oil certainly won't hurt anything.

My logger buddies are old school, they run 1 quart of non detergent 30 weight motor oil in 5 gallons of gas. They burn 5 gallons a day in Stihl 660/661s.

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post #12 of 36 Old 09-28-2018, 08:46 AM
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Re: Fuel Mixture: Is 25:1 and 32:1 Really Necessary?

Not all fuel oils are the same. Some are conventional, others are synthetic blend, and still others are full synthetic. Marine versions are different than the normal fuel oil for land based equipment too.

I do use and sell a professional multi-mix that spec'd for engines running 16/1 to 50/1 without problems. The problem comes in when fuel oil use is not a multi mix oil. Even Stihl 50/1 will burn up a 40/1 unit. I know as I loaned out my left blower 40/1 while repairing the customer's Stihl blower 50/1. I ran it a good number years using my multi-mix oil but the customer destroyed it with a couple days using the Stihl oil in his fuel mix.

On top this if the operator is mixing their own fuel using non-premeasured oil they often use what ever handy not a true measuring tool. If using measuring spoons they don't clean them between each measure leading oil total amount that are less the required total amount.

The guys mentioned that are using 1 qt SAE30ND to 5 gallon of fuel are running a 20/1 mix.

BTW the are some synthetic fuel oils claiming the ability to run up to 200/1 mix ratios. Those I haven't tried and even if I did probably would run them at much closer to the equipment specs.
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post #13 of 36 Old 09-28-2018, 09:42 AM Thread Starter
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Re: Fuel Mixture: Is 25:1 and 32:1 Really Necessary?

I have old Homelite at 16:1 I used some VP Fuels premix and 40:1 in the saw, and you know what? The world didn't end. Saw works great on it. And much less smoke.

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post #14 of 36 Old 09-28-2018, 11:17 AM
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Re: Fuel Mixture: Is 25:1 and 32:1 Really Necessary?

Not likely gonna blow up an engine immediately by using a differant mix..... it might run forever like that... but its not going to run at its peak performance... dirt bike racers mess with the mixtures all the time but they also change the jets in the carb and use differant spark plugs... and accept that the engine may not last quite as long as a result.... and they buy the most expensive modern advanced oils/fuels available. They have this mixture thing down to a science but its alot of hassle for chainsaw IMO

I'd prefer to use the engines recommended mixture, its going to be easier to maintain and last longer overall, if anything I would rather have too much oil.

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post #15 of 36 Old 09-28-2018, 12:31 PM
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Re: Fuel Mixture: Is 25:1 and 32:1 Really Necessary?

Well if your equipment is under warranty, then I would mix at manufacturers suggested just because I wouldn't want to invalidate a warranty. I agree that it is a pain to have all the different mixes around, however keeping the equipment working correctly is more important and robhay2 is suggesting to "test" and not just saying it isn't necessary. Lance points out that changing fuel/oil ratios affects compression and he's correct. If I were going to cheat I would tend to cheat on the too much oil side not the too lean oil side.

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