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

 

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.

 

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.

 

that could cause vibration in the rotor possibly I would think no?

 

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.

 

dont to be an *** but is there anyone else that can give me a true diffenant answer on this

 

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

 

is it posable to run 9.7 in a dd with out any problems bc my goal is 13's on an NA that and i want to reach 225hp to the rear

 

I recall reading this somewhere as well.

-dave

 

s5 rotors and counter weights will work great in a gslse engine...

 

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.

 

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.

 

After about 2 hours of googling, the only corroboration I can find is:

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

 

lols

My friend installed S4 rotors in '74-'75 rotor housings with S2 (Y casting) side plates and it runs beautifully all day with a 5" Camden in his 1st gen. No problems.

 

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.

 

Good... Y'all were scaring me a bit... I'd have to go for a different engine plan or use a full S5 engine.

 

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

 

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 ***.

 

I've no reason to "talk out my ***" and i didn't read their e-mail wrong, maybe they measured something wrong at the time, it was about three years ago.

 

The older REPU's came with a 12a the later years introduced a 13B.....


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.
........

 

Woah dude, Calm down... People **** up sometimes and make mistakes. Correct the info and it's all good.

That's what we're all here for, to learn and share info.

Can't we all just get along?

How bout e-shaft? Or are e-shafts all the same? Perhaps some are made with thicker or thinner lobes, or some are lighter and flimsier and flex at certain speeds?

 

The REPU was introduced with a 13B. There were only two models: the PA136 and PA236. Both had a 13B. Where did you get your information from?

 

theres a qute abit or anger going on here yall need to go smokke or something lol

 

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...

 

I got my information from Australian websites since the majority of my members were from there, i'd assume the Aussie models had 12as.