Part 12: 13B Rotary Engine Rebuild - My 76 Mazda RX-5 Cosmo Restoration

Just as I promised last episode, it is finally time to build the engine! Part 12 of my RX-5 Cosmo restoration covers the entire process of building the 6 port 13B Mazda rotary engine. While this engine is a hybrid of GSL-SE RX-7 and Cosmo parts, the process is the same for any rotary from a 12A to a 13B NA, 13B Turbo, 13B-REW or any other variant of the 13B. This video shows the whole process of the engine build, starting from measuring the rotors and covering everything else including clearancing the side seals, assembling the rotors, complete assembly the short block, setting the eccentric shaft end play and installing the front cover and everything underneath it. It's probably the most complete engine build video outside of what you can buy from the vendors, and as such, is an hour long. After this one, I'm going back to videos under 20 minutes. But for now, grab a beverage of your choice, sit back, and enjoy.

Category:

Autos & Vehicles

Tags:

• mazda
• rx-5
• cosmo
• ap
• restoration
• rebuild
• modding
• rotary
• wankel
• engine
• custom
• 13B
• 12A
• 20B
• assembly
• overhaul
• build
• clearancing
• side
• seals
• apex
• corner
• atkins
• measuring
• end
• play
• adjustment
• front
• cover
• stationary
• gears
• tension
• bolts
• torque
• rotors
• GSL-SE
• housings
• irons
• eccentric
• shaft
• rx2
• rx3
• rx4
• rx7
• rx8
• tutorial
• repair
• howto
• instruction

[mrpicoforever]

hallelujah arron, ive been searching high and low for a video like this,thank you very much for doing this.i have a rx8 With a blown engine and garages where trying to charge the earth to fix it.

is working on thr rx8 renesis engine as simple as shown in this video.

im gonna have a go when weather pics up a bit.

thanks

[aaroncake]

@mrpicoforever Yes, for the most part rebuilding the Renesis is the same as any other rotary. There are a few minor differences like the front torrington bearings, so just keep a copy of the Factory Service Manual handy and you should have no problems.

[Ravag8r]

Hey everyone!

i wanna buy a rx7 but my only fear is the apex seals. how often do i have to change them? how hard is it take to take out the engine? and is it hard to open the engine and do all this? i dont wanna screw up the engine.

Thanks!!!!!!!!!!!!!!!

[aaroncake]

@Ravag8r Rotary engines are hardly the ticking time bomb many think they are. If the car is in good shape you will never have to change the apex seals. If the engine is old and worn, you may have to. Or if a tuning error causes it to blow, then you will. Taking out the engine is fairly easy as everything in the bay is accessible. See parts 2, 3 and 4 of my Cosmo restoration for engine removal and disassembly.

[Ravag8r]

@aaroncake Thanks alot! made my life easier! im definitely getting a car with a rotary! im getting a rx7 1993 with a vielside bodykit. im going to install it by myself. Hopefully i do it right!

[aaroncake]

@Ravag8r Well the FD is a different story. It *is* a ticking time bomb. It's quite likely the most unreliable car ever built.

[amahabir]

Thank you so much for taking the time recording, editing and posting such an invaluable and detailed video. The Rotary community greatly appreciates this.

[mrdeathcore99]

subscribed! you're a bloody legend. cheers

[crenly]

Long video buy very helpful

[Walshy044]

I loved the that's what she said comments!

[1pocketbikespike]

Gonna go build me a rotary :)

[rippedboy14]

1 person thought this video was too amazing