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Two new triple-pass radiators from experts in cooling technology PWR.
Part numbers:
- 0000-01-5503-CR (NB 99-05)
- 0000-01-5502-CR (NA-90-97)
Mazda Motorsports saw a need for a better-performing radiator for Spec Miata. For this, Mazda Motorsports turned to PWR, which has long provided advanced cooling technology for NASCAR, IndyCar, and IMSA sports car applications. Consequently, PWR turned out to be the ideal partner for the development of a new set of Miata radiators for Spec Miata, but will also work well for NB racers competing in other categories.
PWR didn’t just take an existing core and slap some mounts on it to make it fit. It was a research and development process that took the radiator from a single-pass design to a triple-pass design for optimal function in the Miata.
We found years ago that Miata’s like a triple pass. In a triple pass, we put a baffle about six inches below the inlet so the coolant will pass through one third, then it goes back the other way, then there’s a baffle about six inches above the outlet, so there’s another pass, and then the last pass will be the bottom third of the radiator. The water goes three times through one-third of the core. It separates the radiator into three smaller radiators.
“This process allows heat to transfer in three different cycles instead of one large process. The duct work and nose openings are critical in these cars, and it happens that the last pass is at the lower area of the grill, where it gets the most airflow across that particular part of the radiator. That’s one of the big reasons a triple pass works so well in this particular application.”
The radiator uses PWR proprietary extruded tube race core and fin design and works with the stock fan – a Spec Miata requirement. It’s a direct replacement for the stock radiator, with no modifications required. It also incorporates a couple of other unique features.
“It may seem small, but we extended the top plate to help direct airflow (NB version). That’s something that’s not on the stock radiators. We also incorporated a zinc anode, which will help reduce the potential for corrosion.
To order, log on to the parts store or call (800)435-2508.
Pricing is subject to change
NA version
NB Version
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