Pinion Adapter
08-29-12, 03:42 PM
#1
Full Member
Thread Starter
Join Date: Jan 2008
Location: Huntington Beach, CA
Posts: 122
Likes: 0
Received 0 Likes
on
0 Posts
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
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
08-30-12, 08:18 PM
#3
Full Member
Thread Starter
Join Date: Jan 2008
Location: Huntington Beach, CA
Posts: 122
Likes: 0
Received 0 Likes
on
0 Posts
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
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
09-04-12, 04:35 PM
#4
Senior Member
iTrader: (3)
Join Date: Mar 2001
Location: San Francisco, California
Posts: 266
Likes: 0
Received 2 Likes
on
2 Posts
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
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?
09-04-12, 07:33 PM
#5
Senior Member
Join Date: Jul 2005
Location: CA
Posts: 305
Likes: 0
Received 0 Likes
on
0 Posts
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
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
Thread
Thread Starter
Forum
Replies
Last Post
joel(PA)
Group Buy & Product Dev. FD RX-7
8
10-04-15 06:07 PM
