Switching to premix?

[bstruckm]

I have a leaky oil tank and was considering switching to premix at least until i fix the leak. Whats involved other than draining the tank?

Whats the mix ratio if I do this?

94 Speedster with dual 657's

 

[LouDoo]

I wouldn't do it, you're going to need the leave the oil tank hooked up to lube the rotary valve. It may not even be the oil tank, have you checked the rubber grommet at the bottom of the oil tank?

It's a real pain to premix the oil with the gas.

Lou

 

[jb92563]

I concur that the oil is used for more that just premixing in the carb, as the oil lines also supply other critical parts.

You will need to keep an oil tank for the other parts even if you do premix.

I would fix the oil tank.

Ray

 

[bookerb1047]

My oil pump failed on my boat..resulting in engine damage. If I had been pre mixing I would not be replacing it. I have now done the oil blockoff kit and it works fantastic. I did leave the oil tank hooked up with some oil in it so it lubricates the rotary valve. I use the bomba lube in the tank. Mixing is super easy, for every gallon: you add the recommended oil strait to your tank. Doesnt get much easier than that. Plus, I never have to worry about burning my motor up.

 

[seadoosnipe]

My oil pump failed on my boat..resulting in engine damage. If I had been pre mixing I would not be replacing it. I have now done the oil blockoff kit and it works fantastic. I did leave the oil tank hooked up with some oil in it so it lubricates the rotary valve. I use the bomba lube in the tank. Mixing is super easy, for every gallon: you add the recommended oil strait to your tank. Doesnt get much easier than that. Plus, I never have to worry about burning my motor up.

It's very rare for an oil pump to fail. What usually happens is the cable that drives the oil pump isn't maintained and frays. Then, it will snap. If the operator/owner isn't aware of this, then yes, they will blow the motor. The oil pump is a simple gear type pump, which is lubricated by the oil in the tank. So, no way for it to lose it's oiling ability.

You can do as much damage, if not more, from premixing the Rotax motors. The Rotax runs on a "variable rate injection" system. This means, at WOT, you might be mixing a ratio of 50 parts gas, one part oil. At idle, through a no-wake zone, your motor could be calling for 100 parts gas, one part oil.

If you premix, I bet your fouling plugs too. Running too much oil will also cause carbonizing of your parts. Which, is like a lacquer that has hardened to your surfaces. When this happens, heat transfer that your oil is trying to carry off, has been greatly reduced because of the carbon coating. It's like a blanket.

If you got to block off and premix, then that's what you got to do. But, I can promise it's gonna cost you 3 times as more in oil per season and also, smoke so bad at low rpm speeds that you'll foul out a few plugs in one season.....

 

[cheappc]

I heard its 3.2 oz of oil per every gallon of gasoline... is this correct?

 

[ocod]

I heard its 3.2 oz of oil per every gallon of gasoline... is this correct?

I doubt your adding a gallon at a time, but yes you are correct
I do 1qt per 10 gallons = 40:1