Life After Installing an SOHN OMP Adapter
 

It has been over 3000KM (that's about 1800 miles) since I skinned my knuckles installing my OMP Adapter. I also switched to 5W40 synthetic shortly after...

I was very delighted to notice a marked difference in fuel economy. I drive mostly highway and was getting between 450 and 490 KM's on a tank (50 liters). After the install of the OMP Adapter I burned one tank of gas and got 487KM on 49 liters and a second tank 50.5 liters this time and traveled 501 KM before I got around to switching to synthetic. Since switching to synthetic oil I have noticed even more improvement in fuel economy, the last tank of gas I drove 514 KMs on 47 liters of fuel. My driving habits have not changed and although I haven't documented every tank of gas this closely the results have been consistent.

Fuel economy was not my motivation for this mod at the onset, but it is a nice bonus for a car that comes with suicide doors and a healthy thirst for high octane fuel. I wonder if others noticed this same difference after this mod.

^ Nice. I have had mine installed for almost 30,000 miles since the new motor went in and I still get the same mileage I always have but I have a lead foot :)

Great news!
I still can't seem to get more than 300km to tank with mostly city driving.
Waiting on BHR and new plugs :) My next purchase is the Sohn, so this is some good news!
However, it won't help me as 1. I also have a heavy right foot, and 2. FI is a sooner possibility than I thought :naughty: (which means I'll probably find my right foot to be a lil heavier... :icon_no2: )

Are you sure your gas mileage increase isn't just from the warmer weather this time of year?

BC.

I drive a different car in the winter, the weather has only wamed up slightly since I got on the road this year. It is my first year with the car and have done other mods as well.

I replaced coils, wires and plugs with a BHR Kit and installed the Revi Intake and RB Cold Air Duct in the winter along with a couple of other things that would not change performance before I took her out on the road.

One thing that should actually have a negative impact on gas mileae is that I have been driving a co worker who is over 200 lbs to work the past month and that is why I am so surprised my fuel economy has improved like this.

Another thing that may have relevance is that I did a seafoam treatment before I installed the OMP Adapter and have been premixing my gas since then. I started using 5 oz of 2 cycle oil per tank, after the OMP Adapter was installed and I saw the consumption rate I cut back to 3 oz premix per tank, and have run without premix a couple of times.

Good tips and a link to a nice DIY on the install for the OMP Adapter on my thread linked below my sig.

The Sohn probably wouldn't give you better gas mileage. Maybe a little. From what I noticed when I switched to synthetic 10w40 and did the Sohn, things didn't change. I think my average MPG went up about 1 with a midpipe, premix, and Sohn. Pretty sure my driving habits didn't change, or maybe they did.

I didn't get enough time with my engine after Seafoam to see if it made a difference or not. I think the (I figured) stock ignition on 40,000 miles was holding a lot back.

Averaging things out, it would seem my mileage has improved by about 10 percent with similar driving habits and conditions. The change was gradual and it was confirmed in my mind that I was definitely getting better fuel efficiency after the described changes, especially with a passenger travelling to work with me every day (130 KM return, that's about 75 miles highway). I have no other explanation since I didn't drive my car (except home from where I bought) until after the BHR Kit was installed.

Maybe I didn't get enough time to get good averages. I took the cat off after about two fill ups. Did the oil after another 4 or 5. Then seafoam 4 or 5 after that. I was getting between high 17 to high 18 for the most part. It was going up though, just slowly.

Something that I did last week..

I accidentally filled the car with regular gas, my mileage results were 470 KM on 50 liters. The type of driving was virtually the same. The car ran fine and I noticed no other difference.

This has nothing to do with 2 cycle oil, however I thought it might be interesting to some of you. I have no intention of using regular gas in the future, first because the savings are small and it's potentially harmful to the cat.

hopefully I get some good results like that.
I'll be installing a sohn adapter in a week or so.

Aside from the fuel savings, the Sohn OMP Adapter will be an upgrade..

Just be sure to read up on the install while you wait, it has its challenges but with patience and some of the helpful tips by those who have been through it you will manage.

Good luck!

All those above mods should increase mileage (intake, ignition, plugs, wires); but I don't think the sohn has anything to do with it...

Your car was parked for the winter I'm assuming you removed the battery and your PCM reset, meaning the increase in mileage could be from your fuel trims resetting....?

You have to take the battery out to install the omp adapter so that is a valid point..

I noticed slightly better fuel economy after switching to synthetic oil too.

what does a sohn do for the car? can i get a link?

You must be getting like 50 mpg with all these fuel saving mods ......

^ No shit. I wonder why I get such shitty mileage? Oh that's right, it my damn right foot.

Your car has an oil metering pump or omp, it's job is to inject oil for lubrication into the combustion chamber as part of the rotary design. That is why Mazda recommends that you use 5W20 dyno oil. The Sohn adapter combined with a reservoir allows you to feed 2 cycle directly to the combustion chamber and also makes it safe to use synthetic engine oil. Some feel premixing 2 cycle oil in the gas tank is still beneficial but with the adapter there is no engine oil entering the combustion chamber which is good because it is not designed to burn and can cause carbon buildup.

Here is the link for the adapter: http://www.rotaryaviation.com/oil_in...p_adaptors.htm

If you go to the link below my sig you will be able to read discussion, get tips, see pics and find links to DIY installation for the adapter.

Thank you, I'm convinced on doing this to my 8

Since the sohn adapter (20 Months / 9000 miles) my avarage mileage is 18 mpg (I usualy use my car 70% in town and 30% on countryroad, NO highway). Best was 23 mpg on long way.

I hope someone responds to this seeing how the last post on this thread was several months ago. Looking at the link to where to get the adapters I don't know which adapter to get. One says 12A, another says 13BMech, another says 13B Electr, and the last one just says Rx-8. I have no idea what to get. Also once the adapter is installed I noticed it is ok to use synthetic oil. What is the best viscosity to use?

Get the RX-8 one. You don't need the optional adjuster because the OMP does that for you. As for the oil question, yes you can use synthetic. Oil weight is up to you.

Simply choose the adapter for the RX-8.


For the reservoir of the Sohn adapter you can use synthetic 2stroke oil or Idemitsu premix oil! (I use Fuchs Titan 2T 100S)

For the oil pan you can use synthetic oil (I prefer 0w-30 Mobil1)

Just want to make you aware that you'll need to source an Oil Container for the SOHN adapter as well as it does not come with anything to hold the oil.

Maybe you knew this, I don't know .. so I'm just say'n

No I did not know this. Thank you. What did you guys do for this? Just fabricate another reservoir? I'm kinda a novice at DIY work.

Search.

Never would've thought of that............ I fully intend on researching it but I wanted to hear what these guys did with their cars. We all learn by asking questions. Thanks for the advice though ;)

with the sohn, do you still need to change the engine oil every recommended 3k miles? it was recommended to change the oil every 3k due to better have fresh oil for the omp or simply the rotary engine needs fresh oil every 3k miles?

Mazda RX 8 Oil Metering Pump Sohn Adapter Installation Support Kit | eBay Rotary Stunna- Go there. Thats the exact kit im buying to go with the sohn adapter.

https://www.rx8club.com/epitroch-211...%24199-252149/

This is if you want to be Fancy. I actually just recieved mine two days ago.

With the sohn adapter you need to change the oil more often, than with factory OMP.

I think with sohn adapter you need change the oil every 3000 miles and with factory OMP every 5-6000 miles.

Be aware that if your a novice at this stuff you'll probably have to get this installed. It's not an easy job and there isn't a whole lot of room to work. I did it on mine last summer and love it. I just recently upgraded to the Sohn adapter support kit from Dan. I also switched my crankcase oil over to AMSOIL 10w-40 Signature series oil and use AMSOIL Sabre pro 2cycle in my oil tank as well as premix with each fill up.

Why? I'd think if anything, it'd be the other way around...

I can see that theory. if you are adding a quart of oil every 1500 miles then you are getting fresh oil in there.

In reality the best thing you can do for an engine is keep the oil fresh. So the more often you change it the better.

Im gonna have to disagree. With the SOHN adapter you CAN change your oil LESS frequently. Your pushing clean two stroke into the motor. Make sure that is ALWAYS filled. You can now change your oil over to a synthetic if thats your cup o tea. But you can also adjust your oil changes farther out. I.E. without sohn adapter every 3000 miles or 6 months whichever comes first. With sohn adapter every4-5000 miles you can change your motor oil. NOW this is IMO only. Anyone goes and F's up there car it's their own fault BUT i've switched to 5-30 synthetic for the motor and Idemitsu 2 stroke Premix for the SOHN and i also premix my gas still. And i plan on changing my oil every 4500 miles. .

To each their own i run synthetic in the motor, but don't see the point in allowing your oil to break down twice as much before changing it. At least you get a mix of fresh and old oil with it stock.

Stop Changing Your Oil! - Edmunds.com

http://auto.howstuffworks.com/synthe...-motor-oil.htm


These are the articles based off of piston engines. There are oil analysis threads here to help you make your mind up. :) Every situation is different, so it will vary from case to case, state to state.

Keep in mind that those articles are based on sedate piston engines. The rotary is a high heat, high stress, high sheer oil environment. Conventional oil is done after 2,500 miles as an example. See the used oil analysis thread for how synthetics hold up. 5k is usually a stretch.


It's true for other engines, certainly. My wife's 2 gets conventional every 5k, and the oil is still faintly amber, so it probably could go much longer. Just be wary of how the rotary is different

I understand the high heat the rotary puts out, BUT again synthetic has come a LONG way since it was first introduced. I should have been more specific within my own thoughts not just the posts i put up. I agree that 6k is a stretch so lets say 4-4500 to be safe. (this is for ME personally) As always that is IMO. Now to be clear i live in PA. I do NOT live in a high heat state. If you live in a high heat state, accompanied by the high heat the rotary puts out it is recommended you change your oil every 3k.

Take a read through the used oil analysis thread, you may chance your mind. They ARE modern oils. :)

Arm yourself with facts .

It depends if your engine seals are working or not, and of course there is a substantial difference between NA and turbo ...

I installed my sohn adapter more than 2 years (~ 11.000 miles) ago. I use full synthetic Fuchs Titan 2T 100S 2stroke oil for it's reservoir.

Since the installation of the sohn adapter plate I fill full synthetic Mobil1 oil in the oilpan (0W-30 in winther and 0W-40 in summer). So I change the motoroil twice a year (only in the oilpan) and the oilfilter only once a year (in autumn). I usually go ca. 3600 miles in summer (ca. in 7 months) and ca. 2000 miles in winther (ca. 5 months).
Every time, when I change the motoroil it's almost black!
Last motoroil change was 1 week ago and we decided to take the oilpan off (it has never been taken off before). The inside of the oilpan was absolutely clean, no metal particles at all! I was very happy! The engine ran ca. 34.000 miles with Dexelia 5W-30 (recommended by the factory in our area) and 11.000 miles with Mobil1 full synthetic oil).
I also add premix to the gas. My engine consumes (trough sohn AND premix) 1 quarter twostroke oil in every 630 miles (1 liter / 1000 km).
My car is in everyday use. Got actually 45.000 miles on the tacho (first engine) and it runs like new. (Bought it in 2006 as new)
I don't use my car on the track, but I race the engine quite often.

@logalinipoo: So it is! And some 2stroke oil comes in every case in the oilpan also, even with perfect oilrings.

I'd say it was nice knowing you, except it wasn't at all :lol:

Here, you might learn a thing or two:

https://www.rx8club.com/series-i-tec...is-tech-99617/

♡
 

the real answer is a peripheral exhaust port and a turbocharger, but with the cursed side exhaust ports you're limited to something with low EGTs (superchargers) if you want any kind of reasonable engine life.

In terms of [ (peak power) / (engine life) ], I imagine you'd be hard-pressed to do better than a Rotrex & Redline pre-mix with a Renesis. Prove me wrong though. I'll even bet you an authentic McMaster-Carr bag full of my coveted fecal matter (shipped via USPS Express).

you should instead keep that and get to know squat ...

Remember when people used to at least respond with actual arguments and counterpoints? They should've never made internet access affordable for commoners. I suppose the RX-8 is a peasant's vehicle anyway.

If you could get back to me with those WHP reports, that'd be greatt.

I gots your peasant.

https://cimg5.ibsrv.net/gimg/www.rx8...140a27d497.jpg

wth, all that bs was deleted earlier today?!?!?