rotor swapability

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Jan 14, 2004 | 04:03 PM

prefix

Thread Starter

Full Member

Joined: Dec 2003

Posts: 214

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From: Austin, TX

rotor swapability

I have a four port 13b I was wondering if I could swap in other rotors without a big problem. I'm looking at getting the 9.7:1 rotors from the later 13bs.

Jan 14, 2004 | 05:11 PM

wwilliam54

it WILL run

Joined: Dec 2002

Posts: 2,017

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From: Raleigh,MS

s5 rotors will fit right in

you need to use a front and flywheel counterweight that matches the rotors tho

Jan 15, 2004 | 03:22 AM

skrewloose78

Anti-rice Superstar

Joined: Sep 2002

Posts: 949

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From: huntsville,alabama

all 13b rotors are interchangable, the only difference being different compression and different weights

Jan 15, 2004 | 07:26 AM

inittab

I read your email

Joined: Jan 2002

Posts: 2,624

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From: NW New Jersey

Quote:

Originally posted by wwilliam54
you need to use a front and flywheel counterweight that matches the rotors tho

What ^ said.

Also more related info from RX-7 Forum > Tech and Performance > General Rotary Tech Support forum

Quote:

Originally posted by rgordon1979
I am in the process of rebuilding a '88 TII engine. In the process of finding a new rear rotor and housing I came across something I have never seen on here before.
As you know, Mazda balanced each rotor at the factory. Due to slight variations in the balancing process, each rotors weight varies slightly. Mazda designates this variation by stamping a letter, (A-E), on the gear side of the rotor. According to Mazda the rotor weight should not vary more than 2 letters in an engine. Ideally, you should have matching rotors. I did verify this with Henry at Mazdatrix. If this is common knowledge, sorry to take up the bandwidth, just wanted to let everyone know.

Rob

Jan 15, 2004 | 08:13 AM

O 16581 72452 5

The infamous number guy!

Joined: Dec 2002

Posts: 1,953

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From: Terre Haute, IN.

The geometry of the post '85 13b rotors had different geometry (unsure of the 4-ports, but different from GSL-SE 13b 6-ports). They will work, but you will have a risk of them coming into contact with the rotor housing at high RPMs.

Ask a place like Mazdatrix for information about this.