Post 3_9559

Gotta Keep Em’ Separated- Catch Can R&D, Part 3: Test Results

Testing is complete! Although we would still like to be cruising through twisty back roads logging R&D miles, it is time to bring the Focus RS back to the stables to examine our catch can. When we test our catch cans, we try to put a wide variety of miles on the car to best replicate normal driving situations. We send one of our engineers out into the wild to put our development vehicle through its paces and ensure our products are functioning as designed.

Focus RS catch can testing
Focus RS catch can testing

Blow-by Meets it’s Match

Although our compact baffled oil catch can has been tried and tested numerous times, we still want to put it through the ringer to ensure that it functions just as nicely on every application. Just like our previous catch can kits, our compact baffled oil catch can has proven itself once again and our testing went off without a hitch. Upon initial investigation we noticed oil buildup in the hose leading to the catch can, on the internals of the catch can, and pooled in the bottom of the can.

Focus RS catch can testing
Focus RS catch can testing
Inside Mishimoto's baffled oil catch can
Inside Mishimoto’s baffled oil catch can
Focus RS catch can test results
Focus RS catch can test results

After 1,000 miles we had a good amount of oil, about 5ml, in the bottom of our catch can. That is not quite as much as we have seen with other applications, such as our Mustang GT. However, it’s still a decent amount of blow-by that is not being re-introduced to the engine. With hard driving, or additional miles, the amount of blow-by could accumulate quickly. We recommend checking your catch can every 1000 miles to establish a baseline, as every car and driving situation is different. For more on blow-by check out our complete write up on Blow-By 101.

Focus RS catch can test results
Focus RS catch can test results

We heard what this catch can has to say and the little guy does have a point. Allowing this mixture to be routed back into your engine may not be the best in terms of longevity. While this modification isn’t going to knock anyone out of their chairs in terms of dyno numbers, it still serves a purpose. We think the catch can is a lot like flossing; you’ll thank us later.

Coming Up!

The  Focus RS Catch Can is now complete and available for purchase! Head over to our product page to check it out and let us know if you have any questions.
Thanks for reading!

One thought on “Gotta Keep Em’ Separated- Catch Can R&D, Part 3: Test Results”

  1. I know this post has been around for a while, but I am 3 months into my RS and am walking through the steps of getting my supporting mods completed before turning up the boost. Some type of catch can is in that list. I’ve noticed looking at some other designs there are check valves to help prevent pressurizing the CC itself under high boost. I don’t see one on yours. Would it be possible to expand on that? DO you have one just not pointed out/listed or why do you think it’s not needed.

    I definitely like the idea of being able to just reach under the car to drain the CC vs. some other methods.

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