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50:1 vs 40:1 gas:oil ratio; are they interchangable?

Old 03-29-2006, 11:09 AM
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50:1 vs 40:1 gas:oil ratio; are they interchangable?

I'm looking at getting an Echo blower, but it's a 2-cycle and specifies a 50:1 gas/oil mix ratio. The two other pieces of outdoor equipment that I have that are 2-stroke both are 40:1. I'd prefer to go all 4-stroke to be honest, but if I must get a 2-stroke blower (since all the good 4-stroke models are like 3 times as expensive) I don't want to have to have to keep ANOTHER seperate gas mix can with 50:1 mix in addition to my existing 40:1 mix can.

I'm sure it'll run with 40:1 mix, but will it make any noticable impact on the longevity or power output of the blower?
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Old 03-29-2006, 11:22 AM
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Re: 50:1 vs 40:1 gas:oil ratio; are they interchangable?

Are you serious

These guys will work on everything. Less oil = overheating, more = blue smoke. For brake-in period, more oil is better.
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Old 03-29-2006, 11:23 AM
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Re: 50:1 vs 40:1 gas:oil ratio; are they interchangable?

Blower? As in leaf blower?

I'm no expert, but I think you'll see a power loss and a more-frequently-fouled spark plug if you use the 40:1 mix in a blower designed for 50:1. (In addition to the extra blue smoke you'll get from burning the extra oil)

Now, we're talking about using 2.5% oil in a blower designed for 2%, so it's not like the difference is going to be noticeable. You seem to concern yourself with longevity and reliability more than the average joe, so maybe you should keep looking (or resolve to keep that extra can around).

Say, what happened to the Seal of Approval?
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Old 03-29-2006, 11:28 AM
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Re: 50:1 vs 40:1 gas:oil ratio; are they interchangable?

Originally Posted by JakeRobb
Say, what happened to the Seal of Approval?
It got stale. I may bring it back sometime. For now Calvin's parents need to keep an eye on robvas so he doesn't get in any trouble.
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Old 03-29-2006, 11:42 AM
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Re: 50:1 vs 40:1 gas:oil ratio; are they interchangable?

Originally Posted by Threxx
For now Calvin's parents need to keep an eye on robvas so he doesn't get in any trouble.
good luck with that
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Old 03-29-2006, 11:56 AM
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Re: 50:1 vs 40:1 gas:oil ratio; are they interchangable?

More oil is not necessarily good in a 2-stroke. In a 4-stroke (that doesnt burn oil directly [except in LS1 applications!]) you want everything nice and oily for protection of metallic surfaces. In a 2-stroke the oil is mixed with the gas and burned, and it needs to be the proper proportions of oil/gas/air to make an efficient cycle. Anything extra fouls plugs (as mentioned) and lessens power. For break-in periods it is standard to use more oil as well as building up the motor RPM in correct increments, but not general use.
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Old 03-29-2006, 12:04 PM
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Re: 50:1 vs 40:1 gas:oil ratio; are they interchangable?

Your going to need to get another gas can. I blew a head gasket on my Toro with the wrong oil/gas mixture, it was a higher then 50:1. The problem was the gas can held more then a gallon of fuel and I didn't realize it. Make sure when you go to the gas station to mark with a marker where a gallon is when filling. Also jot down the ratio so you know which can is which.

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Old 03-29-2006, 12:06 PM
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Re: 50:1 vs 40:1 gas:oil ratio; are they interchangable?

Doug - you sprayed that Toro, don't lie.
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Old 03-29-2006, 12:09 PM
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Re: 50:1 vs 40:1 gas:oil ratio; are they interchangable?

I can't imagine it causing a problem. Mix both of them at 45:1 and call it a day. I bet that is well within the tolerance for mixing for both manufactures.
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Old 03-29-2006, 12:11 PM
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Re: 50:1 vs 40:1 gas:oil ratio; are they interchangable?

Originally Posted by Dave 96TA
Doug - you sprayed that Toro, don't lie.
It happens The Briggs has a 30 shot on it right now, 1/4 acre only takes 15 minutes To bad I have to run at a full sprint.

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Old 03-29-2006, 12:40 PM
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Re: 50:1 vs 40:1 gas:oil ratio; are they interchangable?

Originally Posted by JordonMusser
I can't imagine it causing a problem. Mix both of them at 45:1 and call it a day. I bet that is well within the tolerance for mixing for both manufactures.
LOL...thats what I was thinking. If it was being used 3 hours a day every day, then I'd make sure to use the right mixture
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Old 03-29-2006, 12:41 PM
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Re: 50:1 vs 40:1 gas:oil ratio; are they interchangable?

Heck I ran my 110 and 93 mix with 50:1 in a leaf blower. I wouldnt go less oil but I really dont see were a little more would hurt. I dont think I have ever fouled a plug on a 2 stroke lawn equipment motor either, I think they have higher tolerances than say my dirt bike. The first mix is what I use in the dirt bike and I dont liek to let it sit for too long so it goes in a jug for the lawn equipment.

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Old 03-29-2006, 12:57 PM
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Re: 50:1 vs 40:1 gas:oil ratio; are they interchangable?

I wouldn't worry about it. That little amount of oil won't cause damage in the 2 stroke. Can you imagine some of the people that buy these things? I bet half of them don't know how to start them let alone mix the gas. I would be daring enough to say that you could go easily 10+ or - the wrong way and still be fine. You would be surprised what a 2 stroke can take for abuse!
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Old 12-16-2018, 07:24 AM
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Re: 50:1 vs 40:1 gas:oil ratio; are they interchangable?

Significantly more oil than recommended can collect at key points (valves, plug ports) when running a 2-cycle engine at high revs (full throttle) and can disrupt smooth operation, even causing shutdown. Generally this resolves itself by backing off the throttle, or restarting if necessary, and running at a more moderate throttle. Such clogging rarely happens at the recommended fuel-oil ratios. Running with the right ratio will tend to clean out most residues of clogs, but steel-brushing the plug points or replacing the plug may be helpful after running rich for a while. Running with too little oil can cause more lasting damage, as some of us discovered when Congress paid off agribusiness by adding ethanol to gasoline, raising the combustion temperature and changing the optimal fuel-oil ratios. I lost a good chain saw to that massacre.

I keep a spare 1-1/4 gallon tank around. When a manual calls for 50:1, I fill the little tank 4/5 with my 40:1 mix and then fill the remaining 1/5 of the small tank with straight gas. Problem solved.
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Old 12-27-2018, 08:37 PM
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Re: 50:1 vs 40:1 gas:oil ratio; are they interchangable?

So how did it turn out Kyle? I am sure 12 years is plenty of time to figure it out.


talk about an odd first post.
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