The CSF EvoX Racecar Build – Engine, Oiling & Cooling

You can see how the CSF/Rywire radiator with its flexible mounting locations makes positioning and installing the radator a snap with these simple fabricated brackets. The radiator was mounted as low as possible in the chassis to keep the CG low, but also maintain good airflow to the core once all the other components are mounted.

The CSF oil cooler, Rywire/CSF radiator and CSF/Sheepey intercooler all mount nicely to the front of the car. The radiator and intercooler will get decent airflow. Also take a look at the short and simple charge air pipes for low volume, minimal lag, and minimal flow losses.

We plumbed the car with ultra lightweight XRP HS-79 hose. This hose uses a chemical resistant PFTE liner which resists exotic fuels and oils, and has a temperature resistant silicone outer tube. A wire braided layer is used for burst strength also. Finally, a super tough green aramid layer is used on top for abrasion resistance. The XRP HS-79 hose was chosen for this build because it’s far superior to traditionally braided steel hose. Not only is it way more chemically resistant, but is significantly lighter due to it only having one steel layer. Its smooth outer layer also doesn’t saw through things like braided steel hose can.

XRP also offers a factory crimping service for their fittings which we really like, because the connections are bulletproof and super lightweight. XRP is local to the MotoIQ Garage so sending the hoses and fittings to them for their factory crimping service was a slam dunk. No more taping and sawing sharp braided steel, or braided steel fragments stuck in our fingers!

Ravi of CSF and Ryan of RyWire start running the XRP HS-79 hose to pre-measure all the plumbing before it gets dropped off at XRP for crimping.

When you have this much hose the small weight savings you get from the HS-79 hose really adds up. Every bit of plumbing in the car used the XRP HS-79, not just the oil and coolant plumbing. More on the rest of the plumbing in future articles.

An important note, if you are using HS-79 hose in applications where there is a continuous hard vacuum, such as on the suction side of the dry sump, you need to use an optional internal support coil. In these cases, Pro Plus full PFTE hose (with XS Stainless Steel outer braid) or Pro Plus Extreme PTFE hose (with XM Monofilament braid, XK Aramid braid or XKS Black Silicone) are better choices, but CSF wanted all of the hose to match visually and adding the internal coil reinforcement was an adequate solution in this case.


  1. Good stuff, but the fumes in the cabin will be unbearable with the catch tank in there. Even with my oil/catch tank mounted in the trunk area (which is sealed off from the driver compartment but not totally airtight) the cabin filled with strong fumes almost immediately so we had to run a breather line from the catch tank vent out the back of the car.

    1. We completely agree and will definitely be moving the breather into the trunk. You’ll see our solutions in later articles when we start getting the car ready for track use.

  2. isn’t that oil cooler about half the size of the stock one? I mean it looks a little bit thicker, but is that enough to make up losing about 1/2 the front surface area?

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