20B Rotor Parts

Fits:

• 71-92 Rotary Vehicles - All
• 04-11 Rx8 - Low / Standard power automatics
• 90-95 20B Cosmo

A rotor bearing press tool is needed to remove and install the bearings.

Competition Rotor Bearing has approximately .04" deeper oil grooves and provide approximately .0005" more clearance than stock bearings.

Use on any rotary engine from 1974-1991, and automatic/low power Rx8s.

Detailed images show competition and stock bearing so you can see the difference.

Nine 20B 2mm Stock OEM Mazda Apex Seals

These are 2 piece apex seals, they come super glued together with the tip from Mazda.

Nine 20B 3mm Stock OEM Mazda Apex Seals

These are 2 piece apex seals, they come super glued together with the tip from Mazda.

(18) Mazda OEM 3mm Corner Seal Plugs

18 Cryogenically Treated 3mm Solid Corner Seals, For use on all 20B applications.

See our Cryogenically Treated FAQ

This is an excellent upgrade to any engine. These are desirable under high boost or nitrous applications. This was designed by David Atkins and has been patented.

Mazda basically copied our design with the Rx8, getting rid of their faulty rubber corner seal plug and opting for a steel one basically making their corner seals solid like these.

Do not use these with lapped side housings.

18 Solid 3mm Corner Seals, No Recess
This was designed by David Atkins and has been patented.

This is an excellent upgrade to any engine. These are desirable under high boost or nitrous applications.

Mazda basically copied our design with the Rx8, getting rid of their faulty rubber corner seal plug and opting for a steel one basically making their corner seals solid like these.

These are the same as our original solid corner seals without the depression in them.
We have had some people ask for these so we are offering them again.

Do not use these with lapped side housings.

(18) Patented 3mm Solid Corner Seals, for use on all 12A and 13B 3mm applications.

This is an excellent upgrade to any engine. These are desirable under high boost or nitrous applications. This was designed by David Atkins and has been patented.

This is a one piece corner seal. These can be used in place of the 2 piece Mazda corner seals with plugs. Can be used with the wire type corner seal spring or the 93-95 HP wafer type spring, which is recommended.

Mazda basically copied our design with the Rx8, getting rid of their faulty rubber corner seal plug and opting for a steel one basically making their corner seals solid like these.

Do not use these with lapped side housings.

(18) Mazda OEM 3mm Corner Seals, for use on all 20B 3mm applications.

These do not include corner seal plugs.

6 Inner & 6 Outer Rotor O-Rings, fits all 20B applications.

Factory Oil Ring Inserts can be found here.

Having problems installing your oil control rings with our viton inserts, see this video to show how it is done.

6 Outer & 6 Inner Cryo Treated Metal Oil Control Rings

View our Cryogenically Treated FAQ

20B Factory Mazda Oil O-Ring Insert Kit.

6 Inner & 6 Outer, fits all 20B applications.

Atkins Viton Oil Control O-Ring Inserts are a better, cheaper alternative.

6 Inner & 6 Outer Metal Oil Control Rings
Works with any mazda rotary 20B engine.

6 Inner & 6 Outer Mazda OEM 20B Rotary Oil Ring Spring Set

Fits all 20B rotary engines.

Nine 20B 3mm Apex Seal Springs

Nine 20B 3mm Atkins Designed Apex Seals

All of our apex seals are heat treated. The material for these seals has been developed by David Atkins over his extensive racing career in order to exceed stock apex seal life and durability.

We have customers running 7 second quarter mile times with these seals. Customers use them in a wide variety of applications including turbo, NOS, superchargers, and naturally aspirated applications.

Detonation will ruin any apex seal, none are immune from this problem. Some apex seals will bend under detonation, and become useless, due to lack of compression, these may break but they will do so inside of the rotor and save your housings. The benefit of these is that they can takes much more abuse before breaking than other seals can before bending.

Nine 20B 3mm Short Apex Seal Springs

3mm long apex seal springs sold separately.

This is an optional set of short springs for added support to the apex seals in 3mm applications.

These did not come stock in 3mm applications but can be used with our seals.

Nine short and nine long 2mm apex seal springs for Mazda 20B applications.