Oil ratio for a Scott Atwater 16

[billw]

I was reading the thread about oil ratios for the Speedifour and Speeditwin. It got me thinking (and I didn’t want to hijack that thread) if a guy were going to try synthetic two stroke oil for the first time ever, a Scott 16 seems like the perfect candidate. And I have four of ’em. The factory recommended 16:1, which seems absolutely ridiculous, given that it seems to have all roller bearings. (Not sure about the wrist pins?) I would never dare take a 16:1 motor down to my local lake, for fear of being labeled a polluter by my neighbors. The loss of a Scott would not amount to much, in the grand scheme of things….So what synthetic ratio would I be wanting to try out?

Long live American manufacturing!

[RICHARD A. WHITE]

Well, I think the the synthetic will smoke one heck of alot less, since that was what it was designed to not do.
As for your neighbors, you are breaking no laws, but when you no longer have any boat motors, after they have all been "smoked" because of lack of oil, what will you do then? Just curious…

http://www.richardsoutboardtools.com
classicomctools@gmail.com

[Randy in Tampa]

Bill, I run 30:1 synthetic in everything everything I own with non ethynol gas, I think I could use less but oil is cheap and as Richard said synthetic doesn’t smoke as much and mine don’t smoke noticeably at all 🙂 [/size]

[kerry]

My motors range from 16:1 to 40:1, I run all with Pennzoil full synthetic, and smoke is not bad. I keep the jug handy so I can inform tree huggers that it’s 100% biodegradable.

If you have too many, AND not enough, you're a collector.

[ladler]

The guys at Amsoil told me on an old motor like that to run half the oil with their synthetic, so 32 to 1 on yours would be what they recommend.

[ladler]

I should have said half the oil until you reach 50 to 1. Working great for me. Very little smoke.

[chris-p]

I have found for very little smoke/odour/oil slick, the XD series of oil is fantastic. I use XD30 in my motors, and wont go back.

[billw]

Thanks everyone. I will check into whether it has bushed wrist pins; and if not, then I will try it on 32:1. I’m not sure my neighbors, who congregate at a small-boat "yacht club" down the street, are not too worried about the smoke. It’s the oil in the water, especially when their kids swim near by. They had a perfectly good, oil injected Merc 70 on their committee boat but dumped it in favor of a four-stroker, due to the small oil dots in the water when it ran.

Long live American manufacturing!

[Casey Lynn]

Hey bill……I’ll say it again…..Running an antique/vintage engine on a lean oil ratio is like putting lipstick on a pig. "huh?, but today’s lipstick is so much better!"
What is the piston material? Is it the modern, harder than Hell, hi-silicon material used in later engines designed to run with lean oil ratios? Did the Scott engineers change the shape of the piston from round to semi-elliptical or the length of the skirt or install oil retention grooves or change the rod length and piston pin location to lessen the skirt loads due to crankshaft rotation to combat premature skirt wear for lean ratios? Ever think about that?
It’s not just "is it a roller bearing or a bushing engine" that determines the long term effects of a lean oil ratio.
At least you have plenty of engines to play with!!

[Casey Lynn]

Synthetic oils!
Most are not synthetic at all but are mineral based oils, changed, massaged, and added to that perform to a certain standard and are thereby labeled "Synthetic" by the manufacturer.
SAY WHAT???
Almost all of these "Synthetics" are what are now commonly referred to as Group III oils. Don’t get me wrong, they are good at what they do. But, are they worth in some cases twice the price of a standard dino oil? Do they protect twice as good? Ever read what it takes to submit a warranty claim to Amsoil??
Point here is that if you are using a newer oil that is better for the environment, good on you! If you are using a "synthetic" to drop your oil ratio or oil costs well…not so good. Your failures may not be sudden however accelerated wear will happen. Not so much due to the oil as much as the early design and material make-up of the engine.

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