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!)
How to rebuild a Rotary Bridge Port engine ~ fullBOOST tech files
FullBoost Tech Files, Ep 1 ~ Rebuild
and Bridgeport of a 13B rotary engine @ Mr Parts.
We have started with a stripped down 1984 Mazda RX7 13BT engine, and will
run through the steps involved in bridge porting the engine, then assembly,
to the start up in its new home, a 1972 Mazda 808 (RX3). [
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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 35: Water To Air Intercooler Installation, Part 2 - My 76 Mazda RX-5 Cosmo Restoration
In the last episode of my '76 Mazda Cosmo restoration, the basic components
of the water to air Intercooler system were laid out along
with the considerable amount of fabrication needed to build the throttle
body inlet, Intercooler
piping and water tank. As well as mount the heat exchanger and BOV. In part
35, we finish up the water to air Intercooler installation by taking care
of mounting the pump, plumbing all the water lines and wiring up the
system. Additionally support brackets are built to support the piping. Lack
of space meant I had to get creative with pump position after accidentally
creating a clearance issue with the water fittings. However once mounted I
was very happy with pump position and the plumbing was straightforward.
Included in this episode: Cutting/grinding/drilling aluminium, making
aluminium brackets, assembling AN house and fittings, wiring relay to spare
Megasquirt output, adding temperature sensor to Megasquirt analog input,
plumbing air to water Intercooler with tank and pump, TIG
20B rotary RX-7 Spirit R: The Ultimate Street Mazda
Built by Promaz Automotive, we think it's hard to go past Steve's wicked
Series 8 FD RX-7 if rotaries are your game. Limited to around 1500 unit's,
the Spirit R was the last of the RX-7's and featured a lot of upgraded
factory parts as well as a low 1100kg weight.
Now powered by a lethal Promaz triple rotor 20B extend port rotary engine,
power is aided by a Garrett GT42R turbo
and MicroTech fuel system and transmitted through an Albins 5-speed gearbox
and KAAZ rear end [ http://www.promaz.com.au ].
Part 34: Water To Air Intercooler Installation, Part 1 - My 76 Mazda RX-5 Cosmo Restoration
It's time for part 34 of my '76 Mazda RX-5 Cosmo restoration. This time,
I'm installing the water to air Intercooler. I've installed and
fabricated plenty of air to air Intercoolers in my time but never a
water to air unit. I chose to use water to air on the Cosmo because it
meant that I could keep the piping as short as possible for the best Boost response and because of the
limited amount of room to run charge piping out to the front of the car due
to the large rad and A/C condenser. It was definitely a learning experience
for me as I underestimated the amount of time needed to fabricate all of
the components. Thus, I have split the episode into two parts. In part 1 of
the installation, I fabricate a throttle inlet adapter to fit the FD
throttle body, position and mount the Intercooler, build charge piping, weld
on a BOV flange and IAT bung, fabricate an aluminium water tank with
inlet/outlet/fill bungs and mount the heat front heat exchanger.
Part 36: Fuel System and Fuel Lines - My 76 Mazda RX-5 Cosmo Restoration
With any rotary, a robust fuel system is a critical component in
reliability. This is what will be covered in part 36 of my '76 Mazda Cosmo
restoration. In this episode I set up the engine bay section of the fuel
system. This includes the regulator, fuel Y block, and all the fuel hoses
using braided line and AN fittings. I also bend up a set of stainless fuel
lines for underneath the car. The fuel tank also needed some attention so I
begin the process of getting it cleaned out and ready for modification to
handle an in-tank EFI pump.
The Mazda Rotary Engine Part 1
Educational film by Toyo Kogyo about the Mazda Rotary Engine. Shows how the
Rotary engine works with comparisons to the Piston Engine. Also shows the
Mazda RX500 test vehicle on a banked circuit and the Mazda Cosmo Sport (or
110S). Originates from the late 60's.
Shifting gears - 13B turbo Mazda RX3
Ross' 8-second street driven Mazda RX3 features a Promaz Automotive 13B
rotary bridge port engine, MicroTech EFI and Boosted by a Garrett GTX42R turbocharger through an Albins equipped RX-7
h-pattern gearbox. [ http://www.promaz.com.au ]
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Calder Park, Australia - August 24th 2014.
Mazda Rx7 4-rotor race car. The making of a Defined Autoworks Beast. [Offical Video]
Never before seen footage showing the assembly/start-up of our custom
4-rotor. It is the first 4-rotor since the 787b to use triple spark plugs
per rotor. It is also the first since the 787 to feature telescoping intake
manifold. Custom made slide throttle body system. A world first however is
the use of a center main bearing and 4-piece eccentric shaft. Quick specs-
9.7:1 rotors, lightened and race clearanced. Race main bearings, and race
rotor bearings, ceramic NRS 2mm apex seals. Custom stationary gears, Full
custom Peripheral Port in each rotor housing (defined auto), Aluminum side
housings for reduced weight. Needle roller bearing in the center housing.
4- Piece eccentric shaft 0:47
Dynamic engine balancing 1:23
Variable length intake 2:20
Engine assembly 2:32
Rotor rotation 3:49
Slide throttle 4:00
4-rotor startup and idle 4:30
All footage and editing was done by Defined Autoworks. Music by Ivan
Contact us at 614-592-7991 we build any type of rotary powerplant to the
See the build thread here-
GT4088R Turbo on Bridgeported RX-7 Rev, Spool and Shutdown
Starting, revving and shutting down my aux bridge high compression 6 port
turbo RX-7 looking into the mouth of the
GT4088R ball bearing turbo. Notice the
easy spool and count how many seconds it takes the turbo to stop spinning after the car is shut down.
Talk about turbo response! 10 PSI by
3000 RPM at less then 70% throttle.
The entire build process of this car can be found at
Building a 13B-REW
This is how a 13B engine is brought to life from the Mazda factory.
Courtesy of RE4life.com
"Mazda Factory's veteran Engineer, Mr. Uchitani shows how Rotary Engines
are assembled. Amazing that each RE has been built by hand until 2003!"