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.
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.
13B Peripheral Port LOUD!!!
Some guys 13B Carbbed Peri-port rotary starting and revving at our mazda
car show. Car is a 83 Mazda GLC. It was VERY VERY LOUD in person. I
couldn't even hear him hitting the rev limiter
BDC Porting - Front Secondary w/ Bridgeport
Quick video showing a half-bridgeport plus street port I performed on a
Series 5 front iron housing. Video taken in summer '04.
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!"
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.
Handbuilt 4-Rotor Engine
This was a project that took about five years of weekends to put together.
There was a lot of trial and error as jury-rigged parts were improvised and
revised, leaks were identified and plugged, and byzantine electrical
diagrams were decoded. It still does not run smoothly, as there likely is
a problem with the intake system that has prevented smooth timing at idle.
But she runs!
lots of people wanted to know where the E-shaft came from: it was custom
ordered from a shop in New Zealand.
Peripheral Port 12A Rotary Turning Over (Long)
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