we all need to support iboats marine store when ever possible. you get, competitive prices. fast shipping, top notch customer service. also it provides us, this great FREE forum.
i did use laings and they were great fast shipment cheap prices. so is there a way to know if i run 50:1 or should i just run 24:1 for safety? thank you in advance for advice
Back in my rememberable "old days" I remember that 30 wt engine oil was used at 16:1 in 2 cycle engines. Smoked like crazy.
Then along came outboard oil and 24:1 was the standard.
Then somewhere around the '60's along comes real 2 cycle oil and we had TCW rated then TCW II and now TCW-3.
Also in the '60's McCullough had a little red can of oil they sold and it was a 100:1 mix, or you could use their regular oil at 50:1. (Obviously the only difference here is the quality of the lubricant cause that's all that changed.)
Also, back in those days, automotive oil change intervals were 1000 miles (as were chassis lubes)
Today you can get Mobil 1 with a 15,000 mile guaranteed change....written right on the container and chassis' lubed for life.....first one I had was an '88 Ford P/U with lubed for life front end ball joints.....never had a problem and had it for 10 years and gave it to the son. My current MoPar's have no zerks of any kind anywhere.
Also if any of you remember, due to lubes, a valve job was in order at 45,000 miles and an engine overhaul at 100. Today 250,000 is a regular occurrence with never a wrench on a major engine part.
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So, with respect to running older engines on the mix ratio of the day, I think you (we) are overlooking the improvement in lubricants and I for one would have zero problems running a classic/antique on TCW-3 at 50:1.
Mark, Although I agree with your line of reasoning on 4 cycle motors, I do not think it applies to 2 cycle motors. When 2 cycle motors were using 16::1 and 24::1 gas oil ratios, they also had sleeve-type bearings. When 2-cycle motors went to all needle, rollar and ball bearings, the 50::1 gas oil ratio was acceptable for lubrication. In the case of the '59 Big Twin, I believe it is all needle, rollar and ball bearing consruction. if so, it can use 50::1 mix. If does have some sleeve bearings, than it should use the 24::1 mix. Today's TCW-III oil is much better than the straight weight oil of 1959, in terms of mixing, carbon buildup, coking and other factors, but it is not "superior enough" in lubrication to protect sleeve bearings, when mixed at 50::1.
BTW - Automotive oils need to be drained and changed due to acid buildup and and additive package depletion, rather than viscosity issues. This is why modern oils (better additive packages) outperform older oils, and do not need to be changed so much. However, if you look at the SAE grading of oils, the designation changes nearly every year, which indicates that the oil is improving nearly every year. Newer cars can take advantage of these improvements, but as you have seen in the maintenance schedules, oil change intervals do not rise each year. This obviously mean that the improvment in oil performance between years is not too great.
WBW, last name not laing, but they sure have the stock of old stuff, alot of the others don't, and beat the heck out of ishops shipping cost. all my newer stuff comes from iboats, or the local dealer.
we all need to support iboats marine store when ever possible. you get, competitive prices. fast shipping, top notch customer service. also it provides us, this great FREE forum.
After my dad passed away in 1982, I put his 1958 Evinrude Bigtwin 35 and alumacraft boat back into service. I had our long time local Evinrude dealer install new coils and points. I asked him if the 50:1 OMC oil should be used in the old motor. I was suprised but he said yes that the newer oils would do the job at 50:1 as good as SAE 30. I ran a couple of tanks full at 50:1 without problem. Then one day I was fueling up the tanks at the gas station and there was an old guy with boat on a trailer doing the same thing. He saw me put in one can and then put the gas into the tank. He said "fella I think you're messin up" " Them old motors like oil, lots of oil that there motor takes 24:1" I took his advice. I started using SAE 30 like the manual said. I have talked to several OMC dealers and service techs and their answers vary. Since the late 1980's I have stuck with one quart of TCW to six gallons of gasoline. It smokes less and the spark plugs stay clean even idling while running a trot line. I had the head off last week to inspect the water jackets and if you can believe it, there is still evidence of the factory honing cross hatch pattern in both cylinders. My advice is use the modern TCW two stroke oil at 24:1. I have used SAE 30 in a pinch and always stop the gas a couple of tenths less than six gallons. Changing a fouled spark plug is a lot easier and cheaper than overhauling any engine!
Trackbolt: I am pushing 70, so would I qualify as an older guy? also an OMC mechanic most of my adult life. Your fooling yourself with that double oil.
This discussion brings up an interesting point. My '56 35hp Javelin has full rollers/balls/needles throughout, but the recommended ratio in '56 was 16:1, later changed to 24:1. If the type bearings makes all the difference, why did they wait 8 years to change the spec. to 50:1? Could it be the bearing size was increased, the material was better, better oil made the difference, or they no longer needed the high amount of oil for sealing the crankcase halves and pseudo crankcase seals? Or maybe all the above? But they did leave the spec in place for 8 more years while they improved engine design. In fact, the spec. is actually now 20:1 for that same engine.
Believe me when I tell you I meant no disrespect. The year of my encounter with the "old" guy at the gas station was 1983. I was 31 and the it had been a few years since the "old guy" had seen 70. I was taught to respect my elders and what they had to say. What he said made sense to me. I am not going to doubt you either. I will be 55 this year and believe me I'll be pushing 70 soon enough... Thanks for the heads up.
what is the oil ratio 59 evinrude 35hp
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Re: what is the oil ratio 59 evinrude 35hp
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