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Honda FL250 Airbox Mod |
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Modifications to Honda Odyssey FL250 AirboxThe stock Honda FL250 airbox seemed to be a restriction with it's single, long snorkel. Some people just eliminate the stock airbox all together on their Honda FL250 and use a single open element filter (K&N or UNI). The problem with this idea (at least for me) is that the engine then breathes dirtier air closer to ground level and the air filter can be quickly plugged. In my area, there is a lot of dirt and flying dust when riding, so I knew that I wanted to keep the snorkel idea to help keep the air filter clean longer. In addition, no filter is 100% efficient. There is always a chance for some dirt to pass through or around the filter. This risk increases if you are dealing with a filter element is loaded up and the engine is pulling a higher vacuum behind the restricted filter. Eventually, it can draw dirt through into your expensive engine. In my mind, frequent air filter service is good, but even better is to also try to minimize the amount of dirt that the air filter ever sees in the first place.
So, I decided to keep the snorkel concept and just add one more. I actually had the flex snorkel tubing laying around anyway from past projects. I had originally purchased this flex tubing at McMaster Carr. Great company by the way. Huge industrial supply company that will also sell small quantities to the Average Joe. Great pricing and great service. Enough on that commercial... Having the snorkel tubing on hand, I then needed to come up with a way to attach to tubing to the stock Honda Odyssey airbox.
Additional 2" Pipe Brazed onto Airbox I stopped by a local muffler shop and asked if they had a scrap of 2" exhaust pipe. No problem. They had lots of scraps and they gladly gave me a short piece of 2" pipe. I cut it to the right length and then I used a simple propane torch with MAPP gas to braze the tube in place. I decided to first braze the pipe in place and then to deal with cutting out the opening in the side of the airbox. In that way, I was able to use the pipe as a guide to drill a series of holes all around the inside of the pipe diameter. After removing the disc of metal from the inside of the pipe, I was able to take a die grinder and smooth everything out. Worked well. It was easier for me to do it this way than to try to make a perfect circular hole first, and then try to braze the tubing on later. I then used a hole saw to cut another opening into the plastic intake box up on the roll bar. So, now my Honda Odyssey has dual snorkels feeding into the stock airbox. No optimal for maximum performance, but overall best for my dusty riding conditions. I have a K&N and UNI stock replacement filter elements that fit in the stock Honda Odyssey airbox. I plan to run with the UNI since it's a foam element better at trapping dirt. Here are some links to pages showing some of what I've done on my Honda Odyssey so far: Honda Odyssey Airbox Mod Honda Odyssey Tuned Pipe Honda Odyssey CR250 Head Honda Odyssey Digatron Tach Honda Odyssey Powerbloc Clutch Honda Odyssey FL250 Driven Clutch Honda Odyssey Overheating Solution Honda Odyssey at Beverly Sand Dunes Honda FL250 Water Cooled Head Return to Main Honda Odyssey Page
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