Sohn Adapter and Pre mix
 

I was thinking about getting the sohn adapter for my 8. I read through some posts and didn't see anyone talk about it. So, does anyone pre mix after installing the adapter? Is there any point to premix with the Sohn Adapter? If this has been talked about, I apologize. I must have missed it.

You could choose to add extra oil via premix, especially if you're running stock ECU maps at the track.

Yes many who use the SOHN still premix.

Ok, great now my case of Idemitsu wont go to waste. Thanks!

Many people still premix including myself. I have the sohn adapter installed and run idemitsu 2 stroke both with the adapter and in premix. Im sitting at about 1/2 oz per gallon of premix. Once you install the sohn adapter until your sure you dont have any leaks or anything popping up i would premix a little heavier. The stock OMP system does a great job of lubricating the seals but it still lacks some to be desired. So premixing helps with keeping all surfaces of the seals lubricated well.

huh?

Instead of premixing I keep my sohn adapter reservoir full of Idemitsu.

What are you planning to run through your sohn?

2 stroke. That's what you are supposed to use, correct?

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Keep premixing. It's not like the separate reservoir will solve the issue of the missing central oil nozzle.

Should I use Idemitsu pre mix in both the gas tank and the oil reservoir?

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Yes. but you don't have to use Idemitsu, any good Synthetic JASO FD rated 2 stroke is fine.

well in that case wouldn't it be the same to just premix and not instal the Adapter. Since your are still getting the Cental Oil Nozzle with the premix and not having to worry about sohn adapter related problema like Contamination to your oil or leaking oil from the adapter to places that oil shouldn't be

If you're OK with still injecting crankcase oil, sure.

its a question not an opinion. Im asking because the Mechanics from Elite Rotary Shop when i asked him if they Suggested to get the adapter, they said its a great idea behind it but that it does not even provide oil to your engine when the car is in idle and that there's chances of oil leaking from it to i forgot what. He has an RX8 and he does not have the Adapter on it. He said the most important thing is keeping that Premix on the car. Im just trying to decide because these are reputed guys. They build and rebuild engines for us and they are rated really high so im sure they know whatz???

If the SOHN adapter isn't providing oil at idle, neither is the crankcase. They both use the same oil metering pump, so that logic is flawed. Also, the only way your SOHN is going to leak is if you didn't install it correctly.

All that withstanding, why would you want to inject heat cycled and dirty motor oil that's not designed to burn when you can inject clean two-cycle oil that IS designed to burn?

While my S2 is more complicated - my solution is to change the oil more often ~1000 miles. I have a quick drain Fumoto valve and use generic non-branded certified SAE SN grade 5W20 or -30 in the crankcase. At every drain my oil is slightly darker but translucent. Problem solved. (Also I run a low level or premix - JASO FD grade at 0.25 oz. per gal).

Yea i think that was his point that the car does not get oil from the metering pump no matter from Stock or Sohn when in idle so the important part is having the premix in the gas, and He was referring to a clean installation that there is still chances of leaking. He said you dont want oil leaking to that place cuz its bad. I have the adapter i just now wondering that it may not even be worth installing if this reputed mechanics dont seem to deem it worth it, their cars seem to not need it just premix. They know about the engine since they rebuild them. And Especially since installing it will most likely void my cars warranty wont it?

I was told by the rotary mechanics to use 20/50 in winter months and 10/40 in summer months and i live in Illinois. And yes to change oil often because the Rotary engine works harder than other engines. Has this setup u been using been problem free so far? How long have you done this for? Because from what i hear that s2 does not have an adapter for it yet?

^ That seems backwards to me. Lighter weight oil in the winter and heavier weight oil in the summer is the norm.

Having said that, I use 0W40 year-round, but I live in North Texas, where it matters less.

Adapter or no adapter, you get the same amount of oil at idle and any other point. It's just a question if what oil you want to burn.

"not getting oil at idle" is not a thing. Even if you premix at 1:100, you burn about 0.3 grams of fuel per second at idle. That's 0.003 grams of premixed oil. If you idle for 30 minutes for some weird reason, you've added a total if 4.6 grams of oil. That's nothing, you may as well have added nothing. But it's OK because the engine has plenty of oil film from when it wasn't idle and there combustion temperature and pressure are low. Plus you should just turn your car off at that point.

You can have the adapter or not, that's entirely your choice, but make it an informed choice.

Also 'rotary engine works harder' is not a thing. It works as hard as you push it, like any other engine. It actually experiences less stress overall than a piston engine. You should read up on used oil tests and have some done on your old oil if you want to really get into it. If your oil still has healthy amounts of additive package and is clean of gas and water, and maintains close to original viscosity, changing it early is money out the window. Again, your decision, but make it an informed one.

Yea i mistyped 20/50 on summer and 10/40 for winter lol
How hot and cold does it get over by u guys

^ Teens in the winter and 110F + in the summer.

Idemitsu premix and Motor oil
 

Sorry for waking an old thread but Ive seen that Idemitsu actually makes motor oil specifically for rotaries. So if im running Idemitsu Premix (from my fuel tank) and using said Idemitsu Motor oil then would installing a SOHN still be advantageous?

Yes, because you are injecting fresh, clean oil into it instead of used, dirty motor oil.

I like the 13B-MSP S2 oil injection the best due to the third injector in each housing, but I don't think the two injector arrangement of the S1 is so much of an issue as is the conservative oil flow in the stock ECU calibration. The FD only had a single injector per rotor housing. The FC had one per rotor housing, and an additional two injectors in the intake manifold. None of these experienced experienced excessive apex seal wear in the way that early RX-8's did.

what to use??