Another air box thread, this ones more exciting - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 50 (permalink) Old 03-07-2012, 06:54 PM Thread Starter
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Another air box thread, this ones more exciting

Ok so after purchasing a few different air boxes... a fiberglass thorsten, a carbon fiber thorsten, a squidskins moriwaki copy I finally decided to just modify the stock air box. After looking at these aftermarket boxes its great that they have more volume but that volume is also deceiving. I say deceiving because the entire throttle body assembly is part of that volume where as the stock air box they are not... so here is what I did... I disassembled the box, gutted it and put it back together... it is still a little heavier than the moriwaki copy and of course I dont know the volume but im willing to bet its just as much as the moriwaki! So here are the pics!!!
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post #2 of 50 (permalink) Old 03-07-2012, 06:55 PM Thread Starter
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more pics

some more last pic is all that I removed!
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post #3 of 50 (permalink) Old 03-07-2012, 07:37 PM
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Probably the best OEM airbox mod I've seen so far.
You used the Turn-One filter mount at the mouth of the airbox for easy filter cleaning.
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post #4 of 50 (permalink) Old 03-07-2012, 07:49 PM Thread Starter
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I still need to clean it up some more and I really want a custom K&N filter to fit the mouth. I think it turned out beautifully considering it was 2 hours in the garage and maybe 25 bucks in parts and tools to do it... I also clipped out the center piece in the frame that splits up the air between left and right air filters that no longer exist. Im hoping that once I am done this turns out great! Though its not something that was done all by its self to see if there were performance gains but I can be happy that I have reduced some weight, increased air flow and volume and can use this with my ETI fuel cell and it was in expensive... I should have just done this from the start instead of sinking over 1000 bucks into 3 different air boxes...
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post #5 of 50 (permalink) Old 03-07-2012, 08:13 PM
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Try checking out K&N panel filter number 33-2633
Some have used this for the Turn-One airbox filter instead of the supplied one.

Part 33-2633 Product Specifications

Product Style: Panel Air Filter
Height: 0.938 in (24 mm)
Outside Length: 6.375 in (162 mm)
Outside Width: 4.625 in (117 mm)
Filter Material: Cotton Gauze
Filter Re-Oiling Amount: 0.35 oz (10 ml)
Inner Wire: No
Top Style: Open
Weight: 0.6 lb (0.27 kg)
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post #6 of 50 (permalink) Old 03-07-2012, 08:18 PM Thread Starter
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awesome thanks they have them in stock right around the corner from me!!!
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post #7 of 50 (permalink) Old 03-07-2012, 10:30 PM
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Very cool!! I wish I would have seen this before I had my bike dyno tuned. What all did you need to put this together? I see the panel filter, did you put together the frame for the filter in your pictures?
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post #8 of 50 (permalink) Old 03-07-2012, 10:51 PM Thread Starter
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Its just screen, same stuff used for radiator protectors or vents.. I got it from Brett. The frame came with the stuff I got from brett and it just riveted into the box. Its meant for the turn one air box but with just a minor amount of trimming fit great in the stock air box!!
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post #9 of 50 (permalink) Old 03-08-2012, 09:17 AM
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Resons for not using the other boxes?

I'm curious why you do not care for the other aftermarket boxes. I suspect it is that they may not seal up tight and any gained positive pressure is lost. Am I right? If not, share a little wisdom to this new owner. Thanks, Rich
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post #10 of 50 (permalink) Old 03-08-2012, 11:51 AM
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I can't say I'm in the same boat as I have a TO box but I am all for this type of thing.

I think the boxes make up for the volume by extending the box back and up to the contours of the tank. This along with removing those big air filters (as you have done) account for much of the increased volume.

Without actually quantifying the lost volume due to the throttle bodies it's hard to determine if there is a difference in the volumes. However I do like the idea of a mod that people can do at home, especially if it gives us even a small bump in power. This can be a great intermediate, and pending testing, a potential replacement mod for those that can't/don't want to afford the aftermarket boxes.

2001 #62. Ohlins rear/valves, Micron high mount, HyperPro damper, SharkSkinz, Tyga billet triple clamp, Tyga Carbon Fiber fender and hugger, Ti bolt/custom subframe/alien motion 8 cell diet, 15/41 520, COP conv. PCIII, Venhill lines, modified air box, turn signals in headlights...<deep breath> ZG Touring windscreen, Tech G rear sets, CRF450 rear master w/HRC cover, Tokico 6 pots w/V-pads, CRG Bar end mirrors, PSR Shorty levers-use only clutch, wanna-be basic racer paint, Roman Gold PC wheels
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