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Pinion Adapter

Old 08-29-12, 03:42 PM
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Pinion Adapter

On the Mazda Comp website they list something about a pinion adapter for the fc rear end

http://www.mazdamotorsports.com/pdfs...Drivetrain.pdf

bottom of page 2

"NOT E : 1986-91 RX7 Non-Turbo Ring & Pinions: The 4.33 ratio gear set is the lowest gear set available for 1986-91 non-turbo
RX7s. To obtain an even lower gear ratio (4.44, 4.875, etc.), there are two options:
1. The least expensive modification is very complicated and should be done only by qualified machinists. It requires grafting
(splining and welding) of a short pinion shaft from an early (1979-85) RX7 to the end of an (1986-91) RX7 non-turbo
long pinion shaft.
2. Purchase an adapter kit that allows you to fit a short pinion gear set to the 1986-91 RX7. This is more expensive than the
modification explained above but does provide the ability to install a different pinion shaft later, if you need an alternate ratio."

Does anyone know anything about this? or have any pictures of one?

I did a quick search but didn't find much
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Old 08-30-12, 04:25 PM
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I always just lengthened the pinion shaft as listed in #1. #2 sound like they sell you a new diff carrier to attach to the stock aluminum housing.
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Old 08-30-12, 08:18 PM
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That's what i'm going to do . . . Any tips for lengthening the pinion shaft? I read this thread which seems to be not too complicated

https://www.rx7club.com/race-car-tec...-shaft-633805/

I have access to a lathe. I've machined external tapers before but never the internal ones. The only thing i'm really concerned about is maintaining a reasonable amount of runout
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Old 09-04-12, 04:35 PM
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Originally Posted by Laxfreak3557 View Post
On the Mazda Comp website they list something about a pinion adapter for the fc rear end

http://www.mazdamotorsports.com/pdfs...Drivetrain.pdf

bottom of page 2

"NOT E : 1986-91 RX7 Non-Turbo Ring & Pinions: The 4.33 ratio gear set is the lowest gear set available for 1986-91 non-turbo
RX7s. To obtain an even lower gear ratio (4.44, 4.875, etc.), there are two options:
1. The least expensive modification is very complicated and should be done only by qualified machinists. It requires grafting
(splining and welding) of a short pinion shaft from an early (1979-85) RX7 to the end of an (1986-91) RX7 non-turbo
long pinion shaft.
2. Purchase an adapter kit that allows you to fit a short pinion gear set to the 1986-91 RX7. This is more expensive than the
modification explained above but does provide the ability to install a different pinion shaft later, if you need an alternate ratio."

Does anyone know anything about this? or have any pictures of one?

I did a quick search but didn't find much

I remember seeing that thing on Mazdatrix website a loooonnnnnggggg time ago. It was super expensive. It basically made it so you could swap the pinion gears easier.

I'm not sure who fabricated it, Speedsource maybe?
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Old 09-04-12, 07:33 PM
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We sent ours to Rebello to have the shaft lengthened.

I take on a lot of projects, but this is not one that i would do. I have access to lathes, tig welders, and most machining equipment. Just a risk/cost ratio for us. It wasn't worth it for me to potentially screw it up

E
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