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Published on May 18, 2014
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.