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.
13B PP free rev
Road race injected 13B PP. 315hp at wheels at 10,000rpm (redline), 330hp at wheels at 10,500rpm.
The stumble just off idle is due to the ECU's lack of resolution.
Half Bridgeport RX2
Started my project like 2 months ago and finally shes running, still gotta work a little more with the carb and other minor things but shes a go.
Heres some pics of engine being done and a short video right after I started her for the first time.
Engine is a 88TII with a TII Tranny
12a front cover with GSL-SE oil pan
Half bridgeport, polished Exhaust ports and pined.
Everything from atkins rotary but the apex seals, those are super seals.
Stage 3 bronze ACT cluth and pressure plate from rotary performance.
650 Holley carb with Racing beat Exhaust manifold and headers.
Aluminum radiator from rotary works
