Build a Better Barrel Cooler for under $15 — DIY Project

In this article we cover a better barrel cooler you can build yourself for under $15. This uses a high-speed inflator fan sold on Amazon, along with a piece of temp-stable tubing. Forum member (and popular YouTube host) F-Class John devised this system. He found it cools his barrels in less than half the time of some other products. And the system can also serve as an Empty Chamber Indicator (ECI).

Barrel coolers perform an important function — reducing barrel operating temperatures. This can definitely help preserve barrel life and help maintain good accuracy in competition. In addition, keeping barrels cool can reduce the chances of excess chamber pressure, an important safety concern.

There are a variety of commercially-available barrel cooling systems. There are external fans, as well as internal, slip-in systems than can do double duty as an Empty Chamber Indicator (ECI). You can get the original yellow $39.99 BarrelCool or the red $59.99 RifleKuhl from Magnetospeeed. Both are good products. But F-Class John came up with a system that works even better — one you can build for a fraction of the cost of those yellow or red fans.

Build Your Own Barrel Cooler for Under $15
This system is easy to put together. Order a $11.99 YIVAR pump from Amazon. This is a small, high-output pump designed to inflate air mattresses. Then get some high-temp-rated tubing from a local supply shop. Then trim the case-head off an old piece of brass. Taper the end of the tube a bit and fit it in the case. NOTE: Use of the fitted case is optional. Having the case provides a nice fit in your chamber. But the system works pretty well just with the tubing and Yivar air pump.

In his .284 Win barrel, the Yivar pump system blows air at 10+ mph out the muzzle. F-Class John says that is “about three times the velocity of other systems”. The Yivar pump “holds about 45 minutes of charge” so he can use it for 15 minutes after each of three strings in a match. And then it can be recharged from a USB-compatible battery pack at the range. John notes the fan continues to blow about the same speed for the full 45-minute charge duration.

Key Benefits of this system

1. Faster Cooling
2. Low Cost (under $15)
3. Longer run time on battery
4. Fan battery is USB rechargeable
5. Finally a use for that worn-out brass

John confirmed the effectiveness of his barrel cooler using a stick-on temperature tape placed on the barrel. This showed that his fan system cooled the barreled in less than HALF the time as the plastic commercial fan systems. In addition, his run time was excellent, and the Yivar’s built-in Lithium-Ion battery is fully rechargeable so he never has to buy expensive batteries.

What are the downsides? Not many. The fan IS somewhat noisy — watch video at 4:04-4:28 time mark to hear the fan. F-Class John notes, however, that the Yivar fan is about 4 decibels (dB) quieter than a Magnetospeed RifleKuhl, so the Yivar’s noise is not that bad.

Here are comments from YouTube viewers who like F-Class John’s invention:

Finally something affordable! It’s compact and can be recharged at the range. I have room for this but not all the other gadgets you show. And a poor pensioner like my self can afford it! Thanks for the tip.

Ingenious and awesome idea! I bought one as soon as I saw this. I’ve been thinking about getting a cooler when I’m testing my loads. Thanks!

Brilliant… Brilliant… Brilliant! I have been deferring buying a barrel cooler for years now on account of wanting to spend my toy fund budget on other things. Considering how cheap it is to build, there is no excuse to not make one now.

Fan with Plain Hose Also Works Well (No Brass Case Cutting/Fitting Required)
F-Class John likes the custom fit he achieves with the hose inserted into a piece of modified brass. However he notes that the system also works well with no brass at all — i.e. just hose and fan. If you have a small diameter chamber, this may actually work better. Simply put the hose on the fan, trim/taper the forward hose end to fit and you are good to go.

F-Class John explains: “The heavy duty tubing and the motor works just fine without a brass case. The hose can sit in the chamber by itself. Obviously not every brass case will easily allow for you to put it on the end of the tube. For many people simply using the tube (without brass) may be the simpler option.”

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Tags: Barrel Cooler, Barrel Fan, Chamber Indicator, DIY Barrel Cooler, ECI, F-Class John, Lithium-Ion, USB Charging, Yivar Fan