2 Stroke oil question (history more then anything)

[ryanjames170]

So i have a question for some of you who might know on 2 stroke oil.. why is it that alot of vintage 2 strokes call for such low mix ratios of like 16:1 or 24:1? but yet now they get away with 50:1 or 100:1, is it the type of oil they used to use or the lack of understanding and wiliness of push the envelope..

 

[Deets066]

So i have a question for some of you who might know on 2 stroke oil.. why is it that alot of vintage 2 strokes call for such low mix ratios of like 16:1 or 24:1? but yet now they get away with 50:1 or 100:1, is it the type of oil they used to use or the lack of understanding and wiliness of push the envelope..

Both

 

[jake wells]

has to do with what of type of bearings also i got a engine from 1957 that only gets 16:1 because it has no roller bearings at all.
just plain bronze bushings.

 

[Fish]

Old 2 strokes mixed 30 weight oil with gas, way back when.

 

[ryanjames170]

Old 2 strokes mixed 30 weight oil with gas, way back when.

so they basicly used regular oil you would put in your car or truck.

 

[P.M.P.]

 

[Fish]

Yeah, that was back in the Slick 50s.............

 

[lilspenny]

So i have a question for some of you who might know on 2 stroke oil.. why is it that alot of vintage 2 strokes call for such low mix ratios of like 16:1 or 24:1? but yet now they get away with 50:1 or 100:1, is it the type of oil they used to use or the lack of understanding and wiliness of push the envelope..

Truth be known, those older engines could be run at 40:1 with a quality oil. Today's engines are built with more precise tolerances and coatings so 50:1 isn't a problem under light load/heat, but take an older Pioneer saw from the 60's and it needs more cushion. Whereas it might be 16:1 back then, with modern oil like H1R or HP2 32:1 will work. I had an old Robin trimmer from 1985 that was suppose to run at 24:1, but as the years went by I tried Stihl oil at 24:1 and that trimmer gummed up and stalled. 40:1 worked fine.

 

[EFSM]

I run 50:1 RA in my 1950/60’s Poulan and Clinton saws and they work fine. Oil tech has made a huge step forward, as well as environmentalists.