Project E46 M3: Part 16 – Koyorad radiator installation


…and to simply remove the hose with the radiator off later. I had to pry carefully on the coupling (because it’s plastic) for several minutes before the radiator would release it. But if finally came off.

Here’ a look at our OE radiator unit compared to the Koyorad. To the naked eye they look similar, and it would appear that the only advantage to the Koyorad over the OE unit would be its all-aluminum construction, which promotes greater reliability. But let’s take a closer look and see if there is anything else to be gained here. The first thing I did was count the number of bars and the difference was 47 versus 42, advantage Koyorad. Assuming equal-length bars, we’re talking roughly a 16% increase in capacity with the bars alone.

Now let’s look at the core thickness. When you look at a factory radiator, you’ll notice that the heat exchanger doesn’t go all the way out to the edges.

The Koyorad’s makes use of all of its available space, and places its bars all the way to the edges. As a result, measuring core thickness from the sides isn’t a good comparison.

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