Is the Jury still out? Since when is that even a question? The SOHN adapter is a very simple device that has been in use for years on both the RX7 and RX8 without any adverse affects. The only downside I can see to a SOHN adapter is the hassle you would get from the dealer if you are still under warranty. Other than that, it has no adverse affects on the oil metering system at all. Clean cool 2 stroke versus dirty 4 stroke engine oil seems like a no brainer and the only reason there is no reservoir (like Mazda has done in the past) is because most owners are too lazy to even check the oil level between changes, let alone add fluid to a 2 stroke oil reservoir for the OMP system.

And I agree, you can never change your oil too much. In addition, adding oil between changes is critical. You want to make sure your OMP system is working right and that you are consuming oil at all. At ever Texas 8 event I was always blown away at how many owners did not check their oil level when we filled up at different spots during the day, some because they didn't even know you needed too and some just didn't think it was important. I typically use a full quart of oil after 100 miles or so of hard charging thru the canyons and we normally did about 350 miles total during the day.

 

Just for grins i am going to send my next oil change at approx 96,000 miles to a company named "lubrication engineering 1-800-537-7683". I would like to see the analysis after approx 96,000 miles.I keep my oil topped off regularly.I usually pop the hood every day.Some owners lke a friend of mine drive as you suggested and never check the oil very frequently but then they will pay the price won't the350 miles a day is a lot for me, i generalyy drive maybe 150 miles when i do the mountain runs which i do a lot in the summer.My 8 is usually in the garage in the winter and only driven on no snow days just to put 20 miles oor so to comple6ely warm up the motor.I just ment the jurys out in that there is no comprehensive data on the sohon use.

 

Now I don't have my Sohn Adapter hooked up yet, but logically its a no brainer. I will be running the Sohn adapter and premixing as well this summer. It may be overkill on a stock Renesis but if you love your car and want to keep it around longer, why not?!

 

I second that.I haven't embraced the sohn adapter but i am a fan of premixing for over 90,000 miles.

 

If you are considering installing a sohn adapter, you can simplify the install process with a kit specifically designed to support it.

Both kits alone and kits bundled with adapters are available from us at our eBay store. Please let me know if you have any questions.

http://stores.ebay.com/epitroch

Cheers,

Dan
Epitroch LLC

 

I saw the question come up a few pages ago but never got addressed. I'm intalling a sohn adapter with new oil metering lines and when everything is tightened down they are TIGHT against the thermostat housing and alternator bracket. What's really worrying be is the lines rest right on the thermostat housing gasket thats protrudes about 1/8in and I can just see them getting sawed in two over time. How does everyone route their oil metering lines after installing a sohn?

 

You can always use something like this:

UHMW Tape

 

So after some experimenting and discussing with a few people on a FB post about SOHN not being a pressurized system, just curious on SOHN results and such?

Who has a SOHN?
What mileage installed?
How many miles now?
Compression results?
Any motors with SOHN install needing a rebuild yet?
What 2-stroke oil, and why?

 

I have had one for 6 years or so.

25,000 miles (since engine was rebuilt, also had it for 30,000 miles on my laste engine)

Recent compression tests results were 7.9's or so.

Yes, my last Mazda Reman died and had a SOHN installed but it's failure was related to a failed coolant seal. A SOHN adapter won't prevent you engine from failure, there are a lot of factors involved and several modes of failure.

I run a JASO FD rated fully synthetic 2 stroke oil.

 

With some needle nose pliers you can tweak the OMP line mounting bracket at the t-stat housing to free them up some

 

Oh perfect. Let's leverage the collective wisdom of rotary Facebook groups to make an informed decision about the sohn.

This will definitely end well.

 

Since when was this relevant? The stock OMP isn't pressurized either. It uses engine vacuum. The SOHN doesn't change this one bit.

 

I'm doing the opposite of everyone here - I am removing the Sohn adapter as I need the car to be stock for the class I'm in. After removing it it became very clear to me that the bolts are too long for just the OMP alone. Does anyone know a PN, or the thread, pitch, and length of the bolts? Searching online has netted zero results.

Thanks!

 

The Bolts are M6....I can have a look when I get home if you need measurements

 

That would be great - thanks!

 

No need for sarcasm... If youre not willing to discuss, you dont have to comment.... None the less. How is the stock system not pressurized? Since the oil gets its feed from the whole pilong system which obviously has pressure, the MOP since its not actually a "PUMP" is being fed oil with combination of vacuum effect. But because the the oil is fed from engine in the front cover, would that ammount of pressure increase flow to the MOP stepper, rather than a gravity fed SOHN? Plus there are other people who have track cars who noticed this at first.

 

Excellent i hope you compression stays well. Only reason i asked just curious of the oils specs. Do you daily drive, weekend, or track it?

 

One cannot fix stupid.

You do realize the SOHN adapter was originally developed for rotary powered aircraft?

 

Whether the supply is pressurized via engine oil pump pressure or via gravity... it won't change the flow through the stepper. It's part of the concept of a stepper motor type pump.

 

Yes you are right, you cannot be fixed. Since when is a 13b-msp used in aircrafts? Clearly youre felix wankel, and im only here to learn!

 

 

How wouldnt the pressure matter here? The pressure from engine is much larger than atmospheric, and yes i understand thats why the oil reservoir is mounted high as possible, but how is that compensating? There is a clear relationship between flow and pressure...

 

...


Yes, there is a relationship between flow and pressure in a normal system that is simply pumping as much as it can. This is NOT the case for an OMP. For example, let off the gas completely at 9,000rpm. The stepper motor drops significantly (almost nothing), but you still have near max engine oil pressure. You can go full throttle at 3,500rpm and get near max OMP flow, but have less than max engine oil pressure. There is an oil pressure regulator that keeps engine oil pressure at a specific rate for much of the RPM rev range, where the OMP will supply oil flow based on LOAD, not on RPM.

What relationship are you referring to again?

As long as oil is available to the stepper motor, the stepper motor determines how much oil is supplied, and the pressure of that oil supply has nothing to do with it.

 

Doesnt anyone think mazda who spent millions on engineers to design this engine, would have realized an external source? Yes for the general public and marketing its not appealing "hey double check your 2stroke oil!!" But even in their race applications? No down putting the SOHN here but clearly theres some relationship here, im not saying im right youre wrong, open for discussion, but if youre just gonna say yes or no, with no real data, theory, or evidence, why post?

 

Did you know that you can get most of this info just by pulling data tables off the ECU? It's not made up theory.