Hey I just bought a Sohn Adapter for my 8 and had a couple questions about what oil to use. I did a crap load of googling and forum searching and never came up with a concrete conclusion as to what to use.

From what i understand, people use either some sort of 2 stroke oil in the reservoir or put in Idemitsu Premix.

I'm thinking about going down the Idemitsu Premix route but am not sure about my decision. Do i put the undiluted premix into the reservoir or do I mix it with something for the sohn adapter?

What do you guys use/recommend? Thanks in advance!

 

Don't dilute it.
Use any JASO certified low ash 2 stroke oil.

 

Do you recommend using a low ash 2 stroke oil vs the idemitsu premix? From my understanding idemitsu is not a 2 stroke oil?

 

There are different types, but it's called a rotary premix by Idemitsu.
You can usually find cheaper alternatives if you don't want to special order it.

 

Okay i think i understand now. Thanks for your help! Can't wait to get some 2 stroke oil and install the adapter.

 

So i have it installed and added Idemitsu Rotary Premix to the reservoir. Is there anyways to test that it is working? I primed the tube so there are no air bubbles and added some premix to my gas just incase.

I have no CEL and the car drives exactly like normal with no oil leaks.

 

Hi Aorkennykiller

How's the SOHN adaptor holding up for you?
About how much 2-cycle are you going through?


A question for you or anyone else:
How is the oil pressurized for injection? It is my understanding that the OMP has a stepper motor to open a valve allowing more oil to pass through and there is also an adjustable potentiometer I assume is designed to feedback the valve position.

Further it is my understanding that the SOHN adapter simply blocks the feed of crankcase oil and instead provides a barbed fitting as an alternative feed source for cleaner, higher quality and more desirable oil. Functionality of the PCM driven metering is unchanged , only the source of oil that is metered to the combustion chambers.

Not knowing more about the operation of this system I am assuming two things:
1)In a stock system the oil feeding the metering pump is pressurized from the oil pump that is also supplying other parts of the motor.
2)An SOHN is essentially gravity feed 2stroke to the metering pump.

IDK. What am I failing to understand here?

 

Well i just installed the Sohn Adapter and as far as i know i have no way of knowing if oil is being injected like it is supposed to be. You're correct about the Sohn adapter blocking the feed of crankcase oil and changing the source of oil. Its just a little daunting knowing that my engine will fail rather quick without any oil used for lubrication.

It just worries me that post installation i dont have any way of knowing that oil is being injected like normal.

Does anyone know if i would get a CEL if the OMP is not injecting oil properly or is not working? Are there any symptoms that it is not working?

 

The only realy way to know is to see the level going down. Premix until you're satisfied that is happening. A few high rpm runs should flush any air from the system. Optionally, continue premixing.

The oil injectors line is not pressurized, the OMP simply pushes the oil down the line at a set rate, and engine vacuum plays a role in sucking it down. It doesn't actually inject in the same way that fuel is injected, there is no mist. It just dribbles and gets smeared around by the apex seal.

 

Thanks this definitely gives me a better understanding of why i dont immediately see it move when I drive my car pretty hard. I used the 1/2 oz to 1 gal of gas ratio. For my purpose is there a different ratio that you would suggest?

 

The pump is a positive displacement pump.....the supply is not pressurized in the OEM feed either. ( on a Series 1 RX-8) The Series 2 uses a different system and the Sohn doesn''t work.
The stroke of the pump is adjusted by the stepper motor and allows for different amounts to be injected

The ideal scenario to use is an aftermarket tuner like a Cobb Accessport or MazdaEdit to adjust the oil amount injected via the ECU map that controls the pump