9.7 compression rotors in 85 se
09-09-05, 06:21 AM
#1
wheres the water goin?
Thread Starter
iTrader: (9)
Join Date: May 2005
Location: Nor Cal
Posts: 1,586
Likes: 0
Received 0 Likes
on
0 Posts
9.7 compression rotors in 85 se
im wanting to put s5 high compression rotors in my se engine and i wanna know what all i gotta do to do this swap and on a side note about what kinda extra hp would this yeild me thanks in advance guys
09-09-05, 07:05 AM
#2
The infamous number guy!
Join Date: Dec 2002
Location: Terre Haute, IN.
Posts: 1,953
Likes: 0
Received 0 Likes
on
0 Posts
You can't do that, the geometry of the rotors are slightly different. It will work, but there's a high risk of the rotor coming into contact with the rotor housing in high RPMs.
09-09-05, 08:45 AM
#3
Right near Malloy
iTrader: (28)
Join Date: Dec 1999
Location: Behind a workbench, repairing FC Electronics.
Posts: 7,847
Received 513 Likes
on
348 Posts
Huh? They're both 13B's, so they should both have the same eccentricity and dimensions. The S5 rotors are machined versus the S3/S4 cast rotors... If anything, there should be MORE clearance with the S5 rotors.
09-09-05, 08:50 AM
#5
Right near Malloy
iTrader: (28)
Join Date: Dec 1999
Location: Behind a workbench, repairing FC Electronics.
Posts: 7,847
Received 513 Likes
on
348 Posts
I don't see how the S3, S4, and S5 rotor housings are different, except the location of the water jacket seals between S3 and S4/S5, and the addition of the knock sensor on S5 housings. And perhaps 10 deg of spark plug location on S5s.
09-09-05, 02:09 PM
#7
S5 rotors
I have several friends that have interchange rotors through diferrent combination of years/parts and have had no problems. Racing Beat does not recommend to interchange the rotors but many people, (PRs),have done it, with good results. I am not talking about daily dirvers or "shopping cars", I am talking about 12 13 secs 1/3 mile cars. my2cents
Trending Topics
09-09-05, 03:04 PM
#9
Banned. I got OWNED!!!
Join Date: Nov 2003
Location: Mill Creek, WA
Posts: 850
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by O 16581 72452 5
You can't do that, the geometry of the rotors are slightly different. It will work, but there's a high risk of the rotor coming into contact with the rotor housing in high RPMs.
-dave
09-10-05, 01:21 PM
#11
My wife bought me 2 RX-7s
Join Date: Aug 2001
Location: Saskatoon, Saskatchewan, Canada
Posts: 2,328
Likes: 0
Received 2 Likes
on
2 Posts
Originally Posted by O 16581 72452 5
You can't do that, the geometry of the rotors are slightly different. It will work, but there's a high risk of the rotor coming into contact with the rotor housing in high RPMs.
The eccentricity of the 13B has remained constant since they were introduced in the 70's. Even the RX-8 rotors would work in an earlier 13B housing.
09-10-05, 02:30 PM
#13
Banned. I got OWNED!!!
Join Date: Nov 2003
Location: Mill Creek, WA
Posts: 850
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by hammmy
I recall reading this somewhere as well.
-dave
-dave
https://www.rx7club.com/forum/showth...13B+rotor+swap
which was written by O 16581 72452 5 so it's no corroboration at all. I wonder if that thread is what I recall reading.
-dave
09-10-05, 04:18 PM
#15
The infamous number guy!
Join Date: Dec 2002
Location: Terre Haute, IN.
Posts: 1,953
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Jeff20B
This is a little off topic, but the REPU came stock with a 13B. Not a 12A. I noticed this amoung other inaccuracies on O 16581 72452 5's rotary forum. I don't know where he gets his info from, but it needs review.
I was looking to rebuild my engine with S5 rotors in my GSL-SE and MazdaTrix told me about the geometry differences, they told me it can be done successfully, but there is a risk of rotor housing contact. I'd paste the e-mail if i still had it, but it was a few years ago. I think there's a document on their site written on this you may want to search for.
09-10-05, 07:29 PM
#17
wheres the water goin?
Thread Starter
iTrader: (9)
Join Date: May 2005
Location: Nor Cal
Posts: 1,586
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by MosesX605
Bullshit.
The eccentricity of the 13B has remained constant since they were introduced in the 70's. Even the RX-8 rotors would work in an earlier 13B housing.
The eccentricity of the 13B has remained constant since they were introduced in the 70's. Even the RX-8 rotors would work in an earlier 13B housing.
thanks man are you 100% sure about this? not to sound neg. but im hearing you can and you can you knowwhat i mean?
is there someone that has some s5 rotors siting around and can match up side by side and one over the other just for ***** and giggles
09-10-05, 11:45 PM
#18
My wife bought me 2 RX-7s
Join Date: Aug 2001
Location: Saskatoon, Saskatchewan, Canada
Posts: 2,328
Likes: 0
Received 2 Likes
on
2 Posts
Originally Posted by O 16581 72452 5
I just wrote in the description of each forum the summary of what i read through google searching each model, some of it was copied and pasted with permission.
I was looking to rebuild my engine with S5 rotors in my GSL-SE and MazdaTrix told me about the geometry differences, they told me it can be done successfully, but there is a risk of rotor housing contact. I'd paste the e-mail if i still had it, but it was a few years ago. I think there's a document on their site written on this you may want to search for.
I was looking to rebuild my engine with S5 rotors in my GSL-SE and MazdaTrix told me about the geometry differences, they told me it can be done successfully, but there is a risk of rotor housing contact. I'd paste the e-mail if i still had it, but it was a few years ago. I think there's a document on their site written on this you may want to search for.
https://www.rx7club.com/showthread.p...rx-8+rotor+13b
Not all the bugs have been worked out yet, but it's for a race engine, and if there were any difficulty with clearances, they WOULDN'T HAVE USED THEM. In fact they massively overreved the engine (past 12k) and didn't have any contacting between the rotors and the housings.
You either remember their email wrong or you're talking out your ***.
Last edited by MosesX605; 09-10-05 at 11:48 PM.
09-11-05, 03:06 AM
#19
The infamous number guy!
Join Date: Dec 2002
Location: Terre Haute, IN.
Posts: 1,953
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by MosesX605
Mazdatrix themselves have built a S5 motor with Renesis rotors:
https://www.rx7club.com/showthread.p...rx-8+rotor+13b
Not all the bugs have been worked out yet, but it's for a race engine, and if there were any difficulty with clearances, they WOULDN'T HAVE USED THEM. In fact they massively overreved the engine (past 12k) and didn't have any contacting between the rotors and the housings.
You either remember their email wrong or you're talking out your ***.
https://www.rx7club.com/showthread.p...rx-8+rotor+13b
Not all the bugs have been worked out yet, but it's for a race engine, and if there were any difficulty with clearances, they WOULDN'T HAVE USED THEM. In fact they massively overreved the engine (past 12k) and didn't have any contacting between the rotors and the housings.
You either remember their email wrong or you're talking out your ***.
09-11-05, 07:54 AM
#20
Driveline Killer
Join Date: Jul 2004
Location: OC the wicked 714
Posts: 1,463
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Jeff20B
This is a little off topic, but the REPU came stock with a 13B. Not a 12A. I noticed this amoung other inaccuracies on O 16581 72452 5's rotary forum. I don't know where he gets his info from, but it needs review.
Whenever you use rotors from one motor in another just make sure the rotating assembly is all fromthe same motor.
If you wanna use S5 rotors make sure you have the frotn and rear counterweights and the flywheel if you are staying with a stock one.
........
09-11-05, 10:37 AM
#21
Right near Malloy
iTrader: (28)
Join Date: Dec 1999
Location: Behind a workbench, repairing FC Electronics.
Posts: 7,847
Received 513 Likes
on
348 Posts
Originally Posted by MosesX605
you're talking out your ***.
That's what we're all here for, to learn and share info.
Can't we all just get along?
Originally Posted by TurboIIGuy
Whenever you use rotors from one motor in another just make sure the rotating assembly is all fromthe same motor.
If you wanna use S5 rotors make sure you have the frotn and rear counterweights and the flywheel if you are staying with a stock one.
If you wanna use S5 rotors make sure you have the frotn and rear counterweights and the flywheel if you are staying with a stock one.
09-12-05, 07:48 AM
#24
13B engine
The older REPU's came with a 12a the later years introduced a 13B.....
09-12-05, 10:11 AM
#25
The infamous number guy!
Join Date: Dec 2002
Location: Terre Haute, IN.
Posts: 1,953
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by leknaw69
The REPU first came out on 1974, US models. They were sold up yntil 1978 with the 1977 extended cab, (7" or so longer), being the last model. They all had the 13B engines. In 1976 and later years, they came w/5 speed tranny...