Diem Turner
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Honestly, for fan mounts, I still think Powerhobby makes one of the better ones. It's a single clamp that allows the mounting of two 30 or 40mm fans. They come in 3 sizes (40-42mm, 47-49mm and 56-58mm though I've found you can use the 40-42mm clamp on 49mm cans without issue). They only cost $15-17. The amount of air being moved is greatly increased by increasing the distance to the motor so to make it even more effective at cooling you could put some spacers to bring the fans a little further away from the motor.
I understand your thinking but I can say with certainty that fans do more than just move a bit of air around (unless you've somehow managed to hermetically seal the internal cabin of your car which is unlikely). After two passes my motor will be around 65°C and I can drop it to 40°C in about 2 minutes with the two fans I have mounted on there running on 12V. And I don't mean that it'll rise back up again after I turn the fans off. The temp drop according to the sensor happens in 15-20 seconds. After two minutes the actual core temp of the motor has stabilized a solid 20-25°C lower. But, to be fair, since I've gotten very rigid about doing only single passes (maybe one and a half in the case of an abort) I know that my temps don't get anywhere near critical levels so I've just removed the motor fans as well. It just isn't needed if you remain disciplined about your passes and giving the motor time to cool down. I did leave the temp sensor though. I still like having the peace of mind of being able to see motor temperature at a glance.TBH,
I'm skeptical how much fans help with the temperature since the internal cabin of the limitless is pretty small and doesn't allow for much airflow. I think all the fans are doing is recirculating hot air around the motor. I never seemed to have a problem but I don't do too many back to back runs (3 at the most) so I've removed my temperature sensor and my server fan....