Sohn Adapter and Pre mix - RX8Club.com

Notices
Series I Tech Garage The place to discuss anything technical about the RX-8 that doesn't fit into any of the categories below.

Sohn Adapter and Pre mix

Reply

 
 
 
Old 05-15-2014, 01:12 PM
  #1  
Registered
Thread Starter
 
jon15805's Avatar
 
Join Date: Apr 2013
Location: TN
Posts: 80
Thanks: 0
Thanked 0 Times in 0 Posts
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.
jon15805 is offline  
Reply With Quote
Old 05-15-2014, 02:20 PM
  #2  
Put it in "H"!
iTrader: (1)
 
Loki's Avatar
 
Join Date: Jun 2009
Location: Montreal
Posts: 4,189
Thanked 267 Times in 235 Posts
You could choose to add extra oil via premix, especially if you're running stock ECU maps at the track.
Loki is offline  
Reply With Quote
Old 05-15-2014, 02:45 PM
  #3  
Registered
iTrader: (46)
 
9krpmrx8's Avatar
 
Join Date: Jan 2007
Location: San Antonio, Texas
Posts: 33,737
Thanked 328 Times in 267 Posts
Yes many who use the SOHN still premix.
9krpmrx8 is offline  
Reply With Quote
Old 05-15-2014, 04:46 PM
  #4  
Registered
Thread Starter
 
jon15805's Avatar
 
Join Date: Apr 2013
Location: TN
Posts: 80
Thanks: 0
Thanked 0 Times in 0 Posts
Ok, great now my case of Idemitsu wont go to waste. Thanks!
jon15805 is offline  
Reply With Quote
Old 05-15-2014, 05:35 PM
  #5  
Dark Moderator
iTrader: (18)
 
Williard's Avatar
 
Join Date: Jul 2011
Location: PA, Shamokin. Ho-bud
Posts: 2,029
Thanked 54 Times in 47 Posts
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.
Williard is offline  
Reply With Quote
Old 05-15-2014, 10:25 PM
  #6  
weeeeeeeeee
iTrader: (11)
 
ShellDude's Avatar
 
Join Date: Jun 2008
Location: Outside Philadelphia
Posts: 4,115
Thanked 3 Times in 3 Posts
Originally Posted by jon15805 View Post
Ok, great now my case of Idemitsu wont go to waste. Thanks!
huh?

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

What are you planning to run through your sohn?
ShellDude is offline  
Reply With Quote
Old 05-16-2014, 08:30 AM
  #7  
Registered
Thread Starter
 
jon15805's Avatar
 
Join Date: Apr 2013
Location: TN
Posts: 80
Thanks: 0
Thanked 0 Times in 0 Posts
2 stroke. That's what you are supposed to use, correct?

Posted From RX8Club.com Android App
jon15805 is offline  
Reply With Quote
Old 05-16-2014, 08:37 AM
  #8  
#50
 
bse50's Avatar
 
Join Date: Nov 2007
Location: Caput Mundi
Posts: 7,525
Thanked 1 Time in 1 Post
Keep premixing. It's not like the separate reservoir will solve the issue of the missing central oil nozzle.
bse50 is offline  
Reply With Quote
Old 05-16-2014, 09:35 AM
  #9  
Registered
Thread Starter
 
jon15805's Avatar
 
Join Date: Apr 2013
Location: TN
Posts: 80
Thanks: 0
Thanked 0 Times in 0 Posts
Should I use Idemitsu pre mix in both the gas tank and the oil reservoir?

Posted From RX8Club.com Android App
jon15805 is offline  
Reply With Quote
Old 05-16-2014, 10:42 AM
  #10  
Registered
iTrader: (46)
 
9krpmrx8's Avatar
 
Join Date: Jan 2007
Location: San Antonio, Texas
Posts: 33,737
Thanked 328 Times in 267 Posts
Yes. but you don't have to use Idemitsu, any good Synthetic JASO FD rated 2 stroke is fine.
9krpmrx8 is offline  
Reply With Quote
Old 04-21-2017, 04:35 PM
  #11  
Registered
 
Join Date: Apr 2017
Posts: 21
Thanks: 0
Thanked 0 Times in 0 Posts
Originally Posted by bse50 View Post
Keep premixing. It's not like the separate reservoir will solve the issue of the missing central oil nozzle.
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
ChaosReaper is offline  
Reply With Quote
Old 04-21-2017, 05:47 PM
  #12  
Put it in "H"!
iTrader: (1)
 
Loki's Avatar
 
Join Date: Jun 2009
Location: Montreal
Posts: 4,189
Thanked 267 Times in 235 Posts
If you're OK with still injecting crankcase oil, sure.
Loki is offline  
Reply With Quote
Old 04-22-2017, 03:10 AM
  #13  
Registered
 
Join Date: Apr 2017
Posts: 21
Thanks: 0
Thanked 0 Times in 0 Posts
Originally Posted by Loki View Post
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???
ChaosReaper is offline  
Reply With Quote
Old 04-22-2017, 08:33 AM
  #14  
Registered
iTrader: (1)
 
Join Date: Mar 2015
Location: Canton, MI
Posts: 130
Thanked 6 Times in 6 Posts
Originally Posted by ChaosReaper View Post
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?
Andrew5190 is offline  
Reply With Quote
Old 04-22-2017, 08:59 AM
  #15  
////////zoom
 
wannawankel's Avatar
 
Join Date: Nov 2009
Location: Massachusetts
Posts: 1,035
Thanked 41 Times in 38 Posts
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).
wannawankel is offline  
Reply With Quote
Old 04-22-2017, 10:11 AM
  #16  
Registered
 
Join Date: Apr 2017
Posts: 21
Thanks: 0
Thanked 0 Times in 0 Posts
Originally Posted by Andrew5190 View Post
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?
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?

Last edited by ChaosReaper; 04-22-2017 at 10:14 AM.
ChaosReaper is offline  
Reply With Quote
Old 04-22-2017, 10:18 AM
  #17  
Registered
 
Join Date: Apr 2017
Posts: 21
Thanks: 0
Thanked 0 Times in 0 Posts
Originally Posted by wannawankel View Post
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).
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?
ChaosReaper is offline  
Reply With Quote
Old 04-22-2017, 10:58 AM
  #18  
Water Foul
 
Steve Dallas's Avatar
 
Join Date: May 2013
Location: Republic of Texas
Posts: 2,126
Thanked 137 Times in 109 Posts
^ 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.
Steve Dallas is offline  
Reply With Quote
Old 04-22-2017, 03:12 PM
  #19  
Put it in "H"!
iTrader: (1)
 
Loki's Avatar
 
Join Date: Jun 2009
Location: Montreal
Posts: 4,189
Thanked 267 Times in 235 Posts
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.
Loki is offline  
Reply With Quote
Old 04-23-2017, 05:56 PM
  #20  
Registered
 
Join Date: Apr 2017
Posts: 21
Thanks: 0
Thanked 0 Times in 0 Posts
Originally Posted by Steve Dallas View Post
^ 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.
Yea i mistyped 20/50 on summer and 10/40 for winter lol
How hot and cold does it get over by u guys
ChaosReaper is offline  
Reply With Quote
Old 04-24-2017, 08:23 AM
  #21  
Water Foul
 
Steve Dallas's Avatar
 
Join Date: May 2013
Location: Republic of Texas
Posts: 2,126
Thanked 137 Times in 109 Posts
^ Teens in the winter and 110F + in the summer.
Steve Dallas is offline  
Reply With Quote
Old 08-14-2018, 01:09 PM
  #22  
New Member
 
Join Date: Jul 2018
Location: Azusa, CA
Posts: 3
Thanked 0 Times in 0 Posts
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?
Kr1st0ff is offline  
Reply With Quote
Old 08-14-2018, 01:41 PM
  #23  
You gonna eat that?
iTrader: (1)
 
BigCajun's Avatar
 
Join Date: Jan 2013
Location: Kansas City, Mo.
Posts: 4,373
Thanks: 0
Thanked 619 Times in 486 Posts
Originally Posted by Kr1st0ff View Post
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.
BigCajun is online now  
Reply With Quote
Old 08-21-2018, 01:28 PM
  #24  
Registered
 
furansu's Avatar
 
Join Date: Mar 2018
Location: Colorado Springs
Posts: 178
Thanked 18 Times in 18 Posts
Originally Posted by bse50 View Post
Keep premixing. It's not like the separate reservoir will solve the issue of the missing central oil nozzle.
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.
furansu is offline  
Reply With Quote
Old 10-03-2018, 10:57 AM
  #25  
New Member
 
Join Date: Oct 2018
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
what to use??

Originally Posted by Loki View Post
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.

what type of 2stroke do you use in australia? idemitsu is hard to come by here!! sorry new to club Sohn adapter on its way just want to know what to fill the tank with when i install it.
moneypitz is offline  
Reply With Quote

Thread Tools
Search this Thread
Rate This Thread
Rate This Thread:
You have already rated this thread Rating: Thread Rating: 0 votes,  average.

Quick Reply: Sohn Adapter and Pre mix


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.