infiltr_eight

We also have that temperatures here in the winter ... no Problem for common 2-stroke oils... no Need the heat the oil tank.


1. no ist alright .... even with -25°C i never had Problems ... just get the car to operating temperature before revving it too high... you will have to block the airflow to the oil coolers at this temperature ... thats it.


2. No ... ist absolutly fine ... use a JASO FC or FD rated 2-Stroke oil wich is meant to be injected and your ok then


3. at -20°C it is obviously not beeter to run a 10W40 ... run a 0W40 or 5W40.


4. Choose the Motor oil that you like with a high HTHS above 3.5mpas and viscosity according to your climate and driving habits.


greets
Thomas

Doblegota

Hello people,

I want to say that I’m running with the sohn adapter using 10w30 idemitsu in both parts.

I have an stupid question.

It’s possible that could be too much oil inside the combustion chamber and part of the fresh oil coming from the reservoir passes through the sideseals and entering to the oil circuit and then increase the level of the oil pan?

I also do premix but just 120ml per 61L gas.

Thanks IN advance!!

NotAPreppie

Why are you putting motor oil in the Sohn reservoir? You should use a 2-stroke oil for that.

You're more likely to have fuel dilute your crank case oil. Why do you ask?

Doblegota

Why “should” ?
In order that it’s not proved anything and notifying that my real oil consumption it’s a little bit higher or quite the same like oem system, it’s not necessary to say that is a must the 2T in reservoir.

My idemitsu dealer and different racers recommend me this method.
Why not?

These is not a 2stroke engine but works “like” a 2T engine. So it’s not a must the 2T oil in order that what we look for is sealant and not carbon. Carbon also seals.

Doblegota

Because I have red in other rx8 forum these thing. Hard premix, sohn adapter and full oil in pan have increased oil level in sump.

Could happen? Could be the possibility that oil not burned passes through sideseals to oil system?

Just that.

Loki

iTrader: (1)

If you engine is broken, yes. Fuel will do the same.

I'm not sure why you would install an OMP adapter and then continue to run oil not made for burning through it. At that point, you may as well just leave the stock system in place.

200.mph

iTrader: (9)

you use idmitsu or other 2 stroke oil in the sohn tank

Doblegota

Really preciate Loki! Thanks.

Well, I can see the real difference of the same oil being used at the same time. Do we have anything what happens during the combustion process with the fresh 10w30 and always fresh idemitsu 10w30. I’m running now 5000km with idemitsu and it’s really black like ink. So it’s acceptable that that kind of used oil burned should not be the best thing. Now it’s always gold & fresh 10w30 and the power of lubricantion should be higher than 2T.
How could be burned quicker 2T than 4t with the sohn??

Doblegota

I have people they said to me:
With 2stoke oil empties quicker than engine oil and that’s strange thinking in omp job.

Loki

iTrader: (1)

People say lots of things. The OMP is metered, you could put beer in there and it would be injected at the same rate. Now if the people happen to drive harder while they have 2T oil in there, that would make it go down faster.

I'm not sure where the perception that 4t oil is a better lubricant for seals than 2t oil comes from. We're not lubricating bearings here.

Doblegota

Neither sealing corners and keeping the three parts separated?

The position of the nozzles are clear or not for what are?

NotAPreppie

It can't. At least not significantly. The people who told you that are wrong.

The OMP is a positive displacement pump so viscosity and output backpressure really don't make a huge difference.

The PCM tells the pump to inject a certain amount based on load and RPM with no feedback regarding how much is actually being delivered or burned.

It lubricates and cools the corner and apex seals, mostly, with a little getting to the side seals. However, almost none of the injected oil reaches bearing surfaces. That's that the motor oil in the crank case is for.

Doblegota

Ok! Thanks for the replies! ;-)

And as figured the nozzles were putted pointing the corners not to be burned. They were relocated for cooling and sealing.

Were is the problem to use fresh idemitsu 10w30 were the 100% of the property’s of the oikare available?

I have to say that I’m actually 800km new user sohn.

Loki

iTrader: (1)

Cooling, sealing and eventually burning. The injected oil doesn't just stay in your engine forever.

Engine oil like your Idemitsu contains a number of additives that do not burn and stay behind. 2-stroke oil is made to avoid this specific problem. But you can do what you want, at some point we're not here to convince you.

TeamRX8

iTrader: (25)

Multi-million $$$ automotive engineering resource group vs n00b in his garage. Who gunna win?

Doblegota

But Loki:

What are the problems of those additives in a rotary engine? In a garden machine were you premix hard you can see tons of carbon deposits everywhere and no problem. Next morning 100% effective ;-)

I didn’t see here a open engine using in the reservoir engine oil ¿do we have any expierience?

I like sohn and could be In the next 2000km to put 2t oil ;-) now: no

Loki

iTrader: (1)

I should have specified that SOME 2 stroke oils, the higher ends ones, address this problem. If you put garden variety TCW3 or lower 2 stroke oil, you're into a whole other set of problems.

Having particles of solid matter getting between the housing and seal doesn't sound like it has many upsides. I would rather avoid it.

Maybe it's all fine in the amounts we're talking about and Mazda did their due diligence in designing the system. I personally don't have a research lab to contradict that. I do know that they're had to setup expensive facilities for rebuilding the engines they replace under warranty, so my bet is they didn't exactly nail it. Based on the available evidence (meaning my own compression test results year over year), it appears using 2-stroke was not a bad call. If it gets me more than 0 extra miles out of the engine, it has done its job.

Let me assure you that a rotary with tons of carbon deposits is not 100% effective
But, that's a whole other problem.

Alexandru Ciureanu

Hey, guys!

Since I was the one to resurrect the topic, I felt that I should get back to you with some feedback.

So what I did was to keep the OMP, but had the output increased through the ECU. I also started to use Total Quartz 15W40 mineral oil for the engine (dexelia 5W30 semi is the Total Quartz 9000). I change it every 3000km (it's cheap)! On top of that, I am premixing with motul 710 (for the winrter) and I will be using motul 800 when it gets hot.

So with the higher omp rate, clean, higher viscosity engine oil and premix, I guess it should be well lubricated. what do you think?

Even in -4 C the car starts in under a second with AEM coils and 15W40 oil... I'm satisfied! Also, as soon as I started premixing (180 ml per tank) with motul 710 the idle is much smoother. Decat too...

ShellDude

iTrader: (12)

Check back with us in 60-80k miles

Locker_09

So does the oil pressure have any effect in the OMP oil injection rate? There is this guy claiming that because of the oil pressure, the OMP injects more oil into the chamber vs the gravity fed SOHN adapter.

NotAPreppie

Theoretically, possibly. In reality, it's such a small effect that it won't matter.

The OMP is a positive displacement pump.
http://www.pumpschool.com/intro/pd%20vs%20centrif.pdf

9krpmrx8

iTrader: (46)

I wish a muthfuka wooouuuuulllllldddd tell me the OMP is not a pump to my face.

Doblegota

I agree and say sorry of my previous comment saying that OMP is not a Pump.

These Pump what does is to provide the same amount of oil in each oil tube to nozzles in a constant pressure and capacity for the four lines.

I though it was not Because it’s similar to a previous step like a valve that gives
THe same amount to the lines.

Sorry.

Doblegota

And also I want to say that I have discovered that I notice that is increasing my oil level from the sump.

I couldn’t saw that without the sohn. But now It makes that having a smelly oil of fuel.

Not normal, right?

Loki

iTrader: (1)

Not normal, if you can get a used oil analysis it might help. But yes, it's not a good sign. Have you changed the oil since you first noticed this? Fuel prevents oil from lubricating important things.