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Cooling System
Our old LS installation’s cooling system used a Howe dual pass radiator core with a remote expansion tank mounted in the back of the engine bay. Having a remote mounted expansion tank allowed us to locate the filler neck higher in the system, increasing our chance of bleeding as much air from the cooling system as possible. Since we had great results with our old cooling system setup we decided to just give it a cleanup at our local ultrasonic cleaner and call it good to go again.
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| Our Howe dual pass radiator with aluminum brackets welded to the end tanks mounts to the frame rails of the RX-7. |
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| It’s not brand new and definitely showing some dings and bent fins but with a good ultrasonic cleaning we’re confident it will keep our new engine cool. |
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| Just in case we get some chassis flex we added some rubber grommets to our otherwise rigid radiator mounting brackets. |
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| Our radiator mounts to the frame rails from the bottom using existing bolt holes. |
Samco silicone bends, a few couplers and a custom piece of 1.25” aluminum tube were used to plumb the radiator to our LS3 while a ¼” length of hose tee’d into the engine’s steam vent leads to the surge tank mounted behind the passenger side shock tower. The main feed line from the surge tank is tee’d into one of the heater core hoses with any overflow routed to drain out behind the passenger wheel well.
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| Stock Mazda cooling fans and a 1.25″ aluminum tube about to be cut down to make a new upper radiator line. |
