OIL ratio in older outboards

[thatone123]

In the older 60's outboards that had the sleeve babbir bearing that used 24-40 or so oil ratio, do you think that with the advances in oil could a synthetic 50/1 mix be used in these vintage outboards. There must be a wide variance in oil ratio as in the 80's they started rating OMC outboards for 100/1 mix. I have been told by OMC engine rebuilders that the internals of the engines never changed, but then how could a 100/1 mix be appropriate?

 

[flyingscott]

100-1 was fine to run on it's been done since the 60s. It was when the motors went into an extended storage period the problems began. There was not enough oil on the internals to protect it while being stored. Anything after 1964 was 50-1 for evinrude anyway so those are good. Earlier I would run the 24-1 mix and be happy those motors are old and the extra oil does not hurt.

 

[jimmbo]

No, those engines with bushing/sleeve Bearings need a lot of Oil so it will get in the bearing and provide a cushion and to prevent Metal to Metal contact. 50:1, no matter how Advanced the oil, cannot do that. The Engines with Anti-Friction Bearings can run on a lot less oil. 100:1 with the advances in oils, is a reasonable amount of Oil, in fact some oil mixing/injection systems reduced to as high as 200:1 at idle. The problem with 100:1, and it has been discussed on this board at least 100 times, is unless the engine is run almost daily, there isn't enough Residual Oil left on the bearing surfaces to prevent corrosion.

 

[MTboatguy]

I run all of mine at 50:1, OMC, Mercury or Tohatsu and have for years now with no ill effects. One of my 35 hp is a Evinrude Big twin that was made in 1962

 

[jimmbo]

Mercury always had anti friction bearings. The Evinrude 35 Hp Big Twin was also a fully anti fiction power head, and can live on 50:1.
BTW there was no 35 in 62. They were made 57, 58, and 59. In 1960, the 40 was introduced

 

[Rook66]

I've been using 50:1 in my 1966 Johnson 3 hp since I inherited it back in the 80s. That's what the sticker on the front of the motor calls for and it works just fine.

 

[jimmbo]

I promote the Smoke as Mosquito Control, besides the sweetest smell in the world is burnt 2 Stoke Oil

 

[flyingscott]

I ran my 60s McCulloch motors on 100-1

 

[MTboatguy]

Mercury always had anti friction bearings. The Evinrude 35 Hp Big Twin was also a fully anti fiction power head, and can live on 50:1.
BTW there was no 35 in 62. They were made 57, 58, and 59. In 1960, the 40 was introduced

Guess it is a 40, I have a couple of them. That or it might be older than I remember

 

[racerone]

This topic has been discussed at length before.-----Should be ----CLOSED

 

[thatone123]

Why close it? Makes for lively discussion and some newbies have never seen it before. We got a good amount of views with differnet flavors. My reason for asking is I sometimes have mixed up lets say 2 + 4 stroke gas, rare but anything can happen when you are in a hurry, even if the gas is in marked cans. I have a few chainsaws that require 40:1, but most of what I run is 50:1. So this might make a decision for me weather I keep or sell my 1962 10 hp. Love the looks, the weight etc. but I always go with practicality and don't want to burn it up, let someone else that appreciated it even more than me have it.

 

[flyingscott]

This topic has been discussed at length before.-----Should be ----CLOSED

You need a hug!!!!!

 

[54bobby]

I fog my engines at years end before they take their winter nap. if the higher oil ratio is for long term storage, does doing this basically do the same thing as running a richer oil mix?

 

[Bosunsmate]

You need a hug!!!!!

haha yes a big bare chested group one

 

[tomhath]

I fog my engines at years end before they take their winter nap. if the higher oil ratio is for long term storage, does doing this basically do the same thing as running a richer oil mix?

Same idea, but fogging puts even more oil inside the motor, and fogging oil is engineered to coat and protect the surfaces while in storage.

 

[Rook66]

I've been using 50:1 in my 1966 Johnson 3 hp since I inherited it back in the 80s. That's what the sticker on the front of the motor calls for and it works just fine.

MOD EDIT - I am the Mod. Liberal has nothing to do with it. Have you read our rules? You should not have made this post questioning a Mod.