2-Stroke oil ratio
Submitted by mr_meks on Sun, 2014-08-31 09:58
OK so I have an old 96 evinrude 115hp thats had the oil injection system disconnected and I'm running 50 to 1 premix. Trouble is she smokes a fair bit at low speeds and it kind of kills the enjoyment factor of cruising around rivers slowly with the family. I was planning on filling my sub tank with 100 to 1 ( half the oil ) , and making sure I dont go over 5 knots. Anyone think this is a really bad idea?
collin g wood
Posts: 313
Date Joined: 18/04/11
.
www.rctek.com/pdf/fuel_to_oil_ratio_chart.pdf
mr_meks
Posts: 189
Date Joined: 11/02/11
What I mean is, I want to
What I mean is, I want to intentionally run less oil at low revs, like an oil injection system would. Im just not sure what ratio my VRO system would have been providing at about 5 knots.
Ashen
Posts: 1042
Date Joined: 22/03/13
What brand oil do you use? I
What brand oil do you use? I find that using Quicksilver premium plus is less smokey than a couple other brands I've used.
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tim-o
Posts: 4657
Date Joined: 24/05/11
Duno what ratio is meant to
Duno what ratio is meant to be for that donk, but may not be a bad thing running less oil. Alot of people think they are doing the engine good buy having a higher oil content in their mix, when in actual fact its doing more harm than good. Will foul plugs and cause starting and running issues but more importantly, it will cause premature wear and even cause a piston to sieze. More oil, less fuel, runs lean, runs hot, greater piston expansion and oil break down from the heat results in damage. Id use a high quality synthetic and a mix rate with the min required oil with premium fuel only, or better yet, upgrade to a 4 banger
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mr_meks
Posts: 189
Date Joined: 11/02/11
"Since 1993, the VRO is
"Since 1993, the VRO is actually called an oil metering system (OMS). The ratio averages about 60:1, slightly leaner at idle and slightly richer at full throttle. The older pumps idled between 150:1 (prior to 1990) and 100:1 (1990-1992), then richened up to 50:1 as the engine load increased"
Thats the only info I've found so far. Not sure exactly what "slightly leaner" at idle means. Maybe I should go for about 80 to 1, using good fuel and oil as suggested for my special low speed low smoke mix.
tim-o
Posts: 4657
Date Joined: 24/05/11
Have a look at the redline
Have a look at the redline oil range, top quality oils, the redline I used to run in my 2 stroke rc car smelt awesome
I am, as I've said, merely competent. But in an age of incompetence, that makes me extraordinary.
RobertMc
Posts: 326
Date Joined: 19/01/09
I did the same with my old
I did the same with my old vro setup and run it and 60:1 no probs at all, no smoke and run like a dream
DTrain
Posts: 486
Date Joined: 10/02/12
oil
What oil are you using? Maybe try switching to XD50 it's more expensive but supposed to smoke less. Penrite also make a full synthetic 2 stroke oil which is supposed to be low smoke.
keg
Posts: 394
Date Joined: 17/07/07
i run my mercury
that has had the oil injection removed at 50:1.it smokes a bit on start up and if you are at low reves for any length of time
but otherwise it is good.i just use what ever oil is the cheapest at the time.
dkonig82
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Date Joined: 06/07/10
that or just cruise at a
that or just cruise at a higher speed :-)
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davidbland50
Posts: 392
Date Joined: 24/07/11
I agree
with Dtrain. Use the XD50 as this will maintain good lubrication while reducing smoke. Go 60:1 as this will be fine with most 2strokes.
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Jackfrost80
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Do you drive a car that is
Do you drive a car that is nearly 20y old?
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