BNR Stage 3 Owners - How Many Running Synthetic Oil?
#26
fart on a friends head!!!
![](https://www.rx7club.com/images/misc/15_year_icon.png)
Originally Posted by Bryan@BNR
Hey Paul.
I don't know if he is or not. How many miles does he have on his motor since he got the engine back?
Bryan
I don't know if he is or not. How many miles does he have on his motor since he got the engine back?
Bryan
ill check with him later on that.
#27
How do I made boost?
![](/images/misc/20_year_icon.png)
![Talking](https://www.rx7club.com/images/icons/icon10.gif)
Originally Posted by rynberg
I'm going to post a thread soon.....how is 308 rwhp at 10 psi for a teaser....![Smilie](https://www.rx7club.com/images/smilies/smile.gif)
![Smilie](https://www.rx7club.com/images/smilies/smile.gif)
Guess this thread answers my question about sticking with dino or switching to synthetic.
#29
"your turbo source"
![](https://www.rx7club.com/images/misc/10_year_icon.png)
iTrader: (1)
Join Date: Aug 2005
Location: Birmingham, AL
Posts: 246
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Mazdabation
Bryan can you give us a schooling on the differences of these seals?
Comparing the 2 in a short summery will be kind of difficult since most of you have never been inside of a turbocharger.
A dynamic seal is a piston ring type seal that goes into a seal plate inside the CHRA (Center Housing Rotating Assembly). That piston ring (compressor seal) has a .003" Gap and that keeps the oil from getting into the compressor housing and keeps boost pressure out of the crank case. The reason there is a gap is for heat expansion. If its a solid ring, it will conform or worp under heated conditions and not seal in the seal plate causing leakage. However, this ring gap does play tricks on rotary engines b/c the turbocharger(s) see full engine oil pressure and the crank case is somewhat pressurized from the air entering through the compressor side ring gap. Turbos can only take so much oil volume (30-50 psi). The oil gets backed up and it starts spewing out of both the intake and exhaust sides when there isn't adequate crank case ventilation or enough restriction. Single turbo applications are all dynamic seal and most all of them require restictor pills in the oil supply to cut down pressure and volume to keep the oil level in the turbocharger lower than the ring gaps on both turbine and compressor sides. When the level is higher than the ring gaps you will see smoking issues. Wear can also cause leaks as well. Dynamic seal has less resistance and is typically the way to go but keeping issues down with smoking I decided to keep the carbon seal for less hasle and to be more user friendly.
Carbon seals were developed by a company called RayJay. They were one of the first pioneers on turbochargers. They developed the carbon seal way back when for draw through style turbochargers, which had the carb set up in front of the inlet of the turbocharger. The carbon seal kept fuel from entering the oil system. Positioning the carb infront of the turbo helps atomize the fuel as it blew to the engine. But later on other companies used the carbon seals for other applications.
The carbon seal is in the RX7 turbochargers from the factory. Carbon seal turbos can take more oil pressure without having smoking issues and in most cases, don't require restrictors. The carbon seal has contact with the rotating assembly at all times creating a total seal on the compressor side. It keeps any boost pressure out of the crank case. Since the vacume is so poor on a rotary engine, the engine needs as much crank case ventilation to keep the oil flowing through the engine. Vacume is the best way to vent the engine. Atmosphere venting is okay in some cases, but strong vacume is by far better. Although carbon seals are a total seal, they naturally pass some oil into the compressor housings and intercooler pipes.
Vehicles that create more vacume dont have problems with dynamic sealed turbochargers. When you get to putting cams in a piston engine lowering vacume thats when they start having similar issues. Porting a rotary engine will also cause a drop in vacume therefore worsening the problem.
I am tired of typing!
Bryan@BNR
205 640 1193
www.bnrturbos.com
Last edited by Bryan@BNR; 01-31-06 at 11:41 PM.
#31
<SNIP>
Vehicles that create more vacume dont have problems with dynamic sealed turbochargers. When you get to putting cams in a piston engine lowering vacume thats when they start having similar issues. Porting a rotary engine will also cause a drop in vacume therefore worsening the problem.
I am tired of typing!
Bryan@BNR
205 640 1193
www.bnrturbos.com
Vehicles that create more vacume dont have problems with dynamic sealed turbochargers. When you get to putting cams in a piston engine lowering vacume thats when they start having similar issues. Porting a rotary engine will also cause a drop in vacume therefore worsening the problem.
I am tired of typing!
Bryan@BNR
205 640 1193
www.bnrturbos.com
Does this 2006 post where you opined that a ported-engine (does that include a street-port ?) does not like the Dynamic Seals and running synthetic motor oil, due to poor vacuum.
If this is still applicable in 2009 for your latest Stage III turbos with Dynamic Seals ?
I have a newly street-ported engine with a vented Jaz oil catch-can.
TIA,
:-) neil
#32
Banned. I got OWNED!!!
Join Date: Jul 2004
Location: next to the polishing wheel!!!
Posts: 1,179
Likes: 0
Received 1 Like
on
1 Post
Very old thread but I will type this today 1 -28- 09 I am running one of the first sets of BNR stage 3 ,and the only set that is supersized .I use syn oil only and inject Amsoil two cycle oil .The turbos have 50 k miles and still are alive and well .They have never been worked on sense Brian built them years ago .I have no desire to go with any other set up .My Rich Mans Non Seq set up has been done and the spoolup is fast and power is very good .I have done the Rich Mans set up on other BNR set as well and the customers seem to be very happy with everything .So to answer the old question,I use syn oil with BNRs and I do not know which seals are in them ,Brian may remember .
#33
Banned. I got OWNED!!!
Join Date: Jul 2008
Location: NC
Posts: 529
Likes: 0
Received 0 Likes
on
0 Posts
I have done the Rich Mans set up on other BNR set as well and the customers seem to be very happy with everything.
#35
<SNIP>
The oil gets backed up and it starts spewing out of both the intake and exhaust sides when there isn't adequate crank case ventilation or enough restriction.
<SNIP>
The carbon seal is in the RX7 turbochargers from the factory. Carbon seal turbos can take more oil pressure without having smoking issues and in most cases, don't require restrictors.
<SNIP>
Bryan@BNR
www.bnrturbos.com
The oil gets backed up and it starts spewing out of both the intake and exhaust sides when there isn't adequate crank case ventilation or enough restriction.
<SNIP>
The carbon seal is in the RX7 turbochargers from the factory. Carbon seal turbos can take more oil pressure without having smoking issues and in most cases, don't require restrictors.
<SNIP>
Bryan@BNR
www.bnrturbos.com
I want to run synthetic or semi-synthetic, and I'm going pre-mix . . .
:-) neil
#36
Original Gangster/Rotary!
![](https://www.rx7club.com/images/ranks/veteran_army.png)
![](/images/misc/20_year_icon.png)
iTrader: (213)
I just spoke to Bryan and he mentioned that the dynamic seals (to run synth) are available at no extra charge.
Also, the oil restrictors are simply the pair of stock oil feed banjo bolts that have been spot welded and had a thin diameter drill bit ran through the weld to yield a smaller orifice.
Also, the oil restrictors are simply the pair of stock oil feed banjo bolts that have been spot welded and had a thin diameter drill bit ran through the weld to yield a smaller orifice.
#37
400Rwhp Seq Twins Baby!!
![](https://www.rx7club.com/images/misc/05_year_icon.png)
Join Date: Mar 2006
Location: "Sunny" ol England
Posts: 362
Likes: 0
Received 0 Likes
on
0 Posts
When I ran my old set of Stage III's I ran synthetic but switched after I had smoking issues...After I went to Mineral I had no problems.
I'll be running Mineral on the new setup aswell.
I'll be running Mineral on the new setup aswell.
![Icon Tup](https://www.rx7club.com/images/smilies/icon_tup.gif)
Thread
Thread Starter
Forum
Replies
Last Post
trickster
2nd Generation Specific (1986-1992)
25
07-01-23 04:40 PM