Manually cranking a freshly built 12A peripheral port engine. The engine is built with 3 window bearings, is doweled and has a shimmed oil pressure regulator. Ultimately it will run EFI and be turbocharged. Plugs are installed (listen to those pops!)
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.
Part 27: Cooling System - My 76 Mazda RX-5 Cosmo Restoration
In part 27 of my '76 Mazda RX-5 Cosmo restoration, I focus on the cooling
system. It seemed an appropriate thing to do with the hot summer weather.
The stock Cosmo rad was leaking, small and hard to obtain so I installed a
universal aluminum radiator after modifying it to fit. With the new rad,
the oil cooler had to be relocated, the engine water inlets/outlets
modified, and a number of other changes had to be made. Once all that was
done, it was time to install the dual cooling fans. Now that the cooling
system is new, modern and overbuilt, I should have no problems even under
the worst conditions. Included in this episode: modifying a universal rad
to fit, TIG welding brackets, making oil cooler brackets, MIG welding them
in place, modifying thermostat and water pump housing, mounting the oil
cooler, trimming and modifying an electric fan shroud to fit the rad,
welding mounting fan mounting brackets, wiring up the e-fans, testing the
Part 32: Air Box and Coolant Recovery Tank Fabrication - My 76 Mazda RX-5 Cosmo Restoration
While I'm done with air conditioning, part 32 of my '76 Mazda Cosmo
restoration still deals with moving air around, as I fabricate a cold
airbox. After working so long on the Vintage Air system I wanted to do some
simple fabrication, so the air box was a perfect choice. Made to accept a
cone filter it is a true cold airbox that draws air from the inner fender.
So not only will the box muffle the sound of the engine but it will also
assure the turbo is drawing in the
coolest air it can. Since I was in an aluminium fabbing mood after the
airbox, I also continue on and build an aluminium coolant recovery bottle.
Fitting perfectly in the little space between the radiator support and
relay panel, made out of square aluminium tubing, it provides a hidden and
elegant solution while not taking up any engine bay space. Included in this
episode: making cardboard templates, cutting aluminium, bending/shaping
aluminium, loads of TIG welding, nutserts, cutting tubing, fabbing a tank,
SCREAMING 20B rotary engine dyno ~ JPC
Centreline Suspension's 20B PP rotary engine from their Mazda RX-7 Sports
Sedan circuit racer on the Dyno at JPC.
Part 7: My 76 Mazda RX-5 Cosmo Restoration - Intake and Exhaust Porting
Has it been nearly a month since my last episode? Wow, time does indeed
fly. I've been quite busy preparing to build the engine. So in part 7, I
cover the intake and Exhaust porting.
The engine is being built with GSL-SE 6 port plates and the Cosmo rotor
housings as the basis for a 6 port turbo
setup. This port job is fairly conservative, only opening up the primary
ports a little and bringing the Exhaust ports close to 2nd gen RX-7 specs. The
goal is to maintain fuel economy, low and midrange torque, and idle
quality. This episode covers everything involved in porting including:
marking out the new ports, grinding the port shape, smoothing the bowls,
smoothing port to runner transitions, smoothing the runners, grinding and
blending the Exhaust ports.
Mazda Rotary Dyno Massive 1664HP
This engine has massive HP, WOW Awsome also on braptv.com Mazda Rotary
Queen Street Racing 4rotor GT60 1664HP
Part 28: Front Inner Fender Reinstall & Using POR-15 - My 76 Mazda RX-5 Cosmo Restoration
Episode 28 of my '76 Mazda RX-5 Cosmo restoration is a sheet metal episode.
Yes, I said sheet metal. In this episode I repair and reinstall a new set
of front inner fender panels (removed all the way back in part 19). I was
able to acquire another set in far better condition and they have been
sitting in the car for several months. While I was waiting for other
unrelated parts to arrive (perhaps a hint for next episode?) I decided to
tackle the inner fenders as it is one of the last major sheet metal repairs
and thus a big milestone in the project. And I was reminded of how much I
don't enjoy sheet metal work. So to make the episode a little more
interesting, I took the opportunity to include some great info on how to
use POR-15. Included in this episode: media blasting, patch panel fab,
welding, grinding, hammer and dolly work, fitting sheet metal panels, spot
welding, using seam sealer, weld primer, prepping for POR-15, using metal
ready, POR-15 tips, applying POR-15.
Onboard 1991 Mazda RX7 IMSA GTO four-rotor at Rolex Monterey Motorsports Reunion
What's it like to drive a priceless, four-rotored piece of Mazda history on
the weekends? Ask Jeremy Barnes, the transplanted Aussie who heads Mazda
North America's public relations department, and the amateur racer can't
help but let an ear-to-ear grin begin to rise.
Along with a dozen other Mazda colleagues, Barnes spent last weekend at the
aptly-names Mazda Raceway Laguna Seca for the Rolex Monterey Motorsports
Reunion where five of the brand's four-rotor rockets were on display.
Thankfully, the static display in the paddock came to life twice a day as
the cars were raced in the IMSA group where Barnes is entrusted to wring
the neck of the tubeframe 1991 RX7 IMSA GTO, and as he shares below and in
the video, each session in the flame-spitting beast is filled with sensory
Turbocharged RX-8 engine teardown and rebuild
With three days to pull the engine, rebuild it and reinstall, is Charles R
Hill from Black Halo Racing (BHR) up to the task?! View the video to see
what we find when the engine with 51,000 miles is pulled.
More details and photos of this rebuild can be seen at:
PS: I admit I didn't hold the camera stable enough for the first day of
footage. Gave me a damn headache editing the footage.