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The pros and cons of pod filters
The pros and cons of pod filters
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The pros and cons of pod filters
Pod filters are small, individual air filters that attach directly to carburetors or throttle bodies on an internal combustion engine.
In the motorcycle world, they are typically used to replace a factory air box and filter to improve the aesthetics and performance of a custom motorcycle.
Motorcycle manufacturers create air boxes as a place to house a stock air filter, but also to ensure smooth airflow, reduce intake noise and prevent rainwater from entering the engine. Electronic components can be mounted inside or on the airbox. Stock airboxes generally take up a lot of space and rarely look good once you start stripping a bike down to its bare essentials. While removing the airbox and installing the pod filters can be relatively simple, getting the bike to run well can be a little challenging. Here are some pros and cons for running pod filters on your motorcycle.
Advantages of capsule air filters
Most people use pod filters for aesthetics. By abandoning the stock airbox, it is much easier to transform the bike into a café racer, scrambler, chopper, bobber, etc. Particularly with vintage machines, the essential look is timeless when done correctly. Additionally, in some cases, it is cheaper to use pod filters if the stock airbox is damaged, missing, or too rare and expensive to replace with OEM parts.
Service intervals for oiled gauze or foam filters are about the same as those recommended in the owner's manual for a stock air filter. An advantage to pods is that most of them can be cleaned and relubricated rather than having to be completely replaced, like the paper element filter that comes standard on most motorcycles. I clean and re-oil the gauze capsule filters once a year on my street bikes, but if the bike is used off-road in dusty conditions, they need service more often.
When it comes to performance, pod filters can potentially allow the bike to breathe easier than the stock airbox. More air equals more performance as long as the proper air-fuel ratio is maintained. This means that in some cases the carburetors need to be rejected or the EFI recalibrated. Typically, this is the biggest problem for people when going to pod filters.
Disadvantages of pod filters
I've heard many people tell me, “The bike ran fine with the stock airbox and exhaust. I switched to pod filters and threw away my mufflers. Why does it work like shit now?!”
I would ask, “Have you recalibrated your fuel system to compensate for the increased airflow?”
Generally, on motorcycles with carburetors, increasing the pilot jet one size, one or two main jet sizes, and raising the needle one groove will get the tune pretty close. You will need a good understanding of your carburetors and what rpm ranges are affected by the different circuits within them. This way you can adjust rich or lean conditions based on where the problem is in the rpm range. Otherwise, you can take your car to your local dyno tuner and have them dial it in perfectly for you. The choice of exhaust also makes a big difference.
EFI bikes can self-regulate to a certain extent, as they use their sensors to read what's going on, so the ECU will compensate by adjusting fueling as needed. Sometimes, however, with pod filters and a free-flowing exhaust, the necessary fuel adjustments are outside the capability of the stock ECU, which is why so many people choose aftermarket fuel tuners after modifying the intake and the discharges.
A custom should work as good as it looks
If you are going to install pod filters on your machine, make sure you get the best quality ones you can find. There are some cheap options available that simply don't filter the air enough, allowing dirt and grit to enter the cylinders. I have rebuilt several engines that were damaged due to poor air filtration, so good quality filters are worth the investment. They are much cheaper than an engine rebuild, guaranteed.
Overall, I really love custom bikes, but only if they perform as well as or better than stock ones. A good looking motorcycle that runs poorly is a disappointment. Hopefully now you know what to expect if you plan to install pod filters on your motorcycle. As always, I'd love to hear your personal experiences with pod filters in the comments section.
⚠️ Legal Notice – Important Product Declaration
This product is not certified, approved, or homologated for use on public roads or highways in any country. It is intended for off-road use only, including closed-course racing, sports competition, or private testing . Installation and use of this product on vehicles operating on public roads is strictly prohibited and may violate traffic laws, emissions regulations, or roadworthiness inspection requirements.
By purchasing this product, the customer acknowledges and accepts the following:
- The product is sold “as is” for sports or off-road use only.
- It is not approved for road circulation and must not be used on public roads under any circumstances.
- Seller assumes no responsibility for improper, illegal or unauthorized use of this product.
- The customer is solely responsible for ensuring that the installation and use of the product complies with local laws and regulations.
- Use of this product outside of its intended use may affect your vehicle warranty and insurance coverage.
This notice applies regardless of the country to which the product is purchased or shipped, including (but not limited to) the United States, Canada, the European Union, the United Kingdom, Australia, and New Zealand.
By proceeding with the purchase, you confirm that you have read, understood and accepted this legal notice, and you release the seller from any liability arising from improper or unauthorized use of the product.
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