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Air box mod done
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Spiderwatts Offline
Break-In Period

Louisiana
Posts: 16
Joined: Sep 2017
Post: #1
Air box mod done
Using earlier info from another forum member I performed the inexpensive airbox mod. Used 3M strong tape. Cut one length in half and made two rounds around stock filter. It’s airtight. Removing big restrictive snorkel and having Yoshimura slip on should all be within ECU parameters and help it breathe better, along with nice sound and a hair more HP/TQ.

Next up are the CNC black footpegs and brackets to go along with KH high seat for more comfort.

Here’s a couple of pics of “modified airbox” and the tape I used. ($7.98 at Lowe’s)


Attached File(s) Image(s)
       
(This post was last modified: 11-13-2017 08:10 PM by Spiderwatts.)
11-13-2017 08:09 PM
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Nortoon Offline
Running Like a Top

Ottawa, Ontario, Canada
Posts: 613
Joined: Jan 2015
Post: #2
RE: Air box mod done
The Scotch Outdoor Mounting Tape is great stuff. I used it to mount a front fender extender on my CB500X. I rode over 33,000 kilometers over 3 summers and it never failed.

2017 CB1100 EX
11-14-2017 09:05 AM
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camoto Online
1st Service Completed

USA
Posts: 56
Joined: Aug 2017
Post: #3
RE: Air box mod done
Not sure if you guys know this but there's a Chinese knock-off of the funnel on ebay for 87 dollars shipped:

https://www.ebay.com/itm/HONDA-CB1100-RS...2749.l2649

I have it and it's a perfect fit, seals up nicely and the anodizing on it is very well done.
11-14-2017 01:41 PM
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4 Paws Offline
High Mileage

MM 199 on BRP (Fancy Gap VA)
Posts: 965
Joined: Jun 2015
Post: #4
RE: Air box mod done
Gotta ask, does it do any good?
Not trying to start an oil thread, an honest question from a fellow rider considering an inexpensive mod.

Best thing I learned from my dog"Never pass up the opportunity to go for a joy ride". - Dan D.
11-14-2017 06:19 PM
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Gumby 1100 Offline
Running Like a Top

Cambridge, Ontario, Canada
Posts: 441
Joined: May 2014
Post: #5
RE: Air box mod done
(11-14-2017 06:19 PM)4 Paws Wrote:  Gotta ask, does it do any good?

Well, Spiderwatts did write: "helps it breathe better, along with nice sound and a hair more HP/TQ". It's hard to dispute the "nice sound", however...

The problem is that "hair more HP/TQ" is very hard to quantify and may partly be placebo effect (especially with the increased "vroom-vroom" sound). Generally, when removing the air box (snorkel) on any bike there may be an increase in power, but usually only at wide-open-throttle. For normal driving, there can actually be a reduction in low end torque and a lack of smoothness (less linear throttle response) at low speeds. I have experienced this on a few bikes after installing Big Air Kits and/or removing the air box...

Engineers did not just create that air box to comply with EPA noise regulations. It also assures that the incoming air flow is metered/controlled to provide a balance of good low end torque and throttle smoothness.

2014 CB1100A (Canadian) #068 (Sold)
2018 Harley-Davidson Road King
11-15-2017 05:10 AM
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SportsterDoc Offline
1st Service Completed

southern Nevada
Posts: 61
Joined: Nov 2017
Post: #6
RE: Air box mod done
(11-14-2017 01:41 PM)camoto Wrote:  Not sure if you guys know this but there's a Chinese knock-off of the funnel on ebay for 87 dollars shipped:

https://www.ebay.com/itm/HONDA-CB1100-RS...2749.l2649

I have it and it's a perfect fit, seals up nicely and the anodizing on it is very well done.

Could that be made from the stock snorkel, using a bandsaw to separate the seal portion of the snorkel?

No idea if there is any improvement on the CB1100 (negative comments on this forum), but snorkel removal on my 2012 Triumph Bonneville made an appreciable difference...even mid-range.

Recent bikes:
2018 Yamaha XT250
2016 Moto Guzzi V7II
2017 Yamaha TW200
2012 Triumph Bonneville
2002 Harley-Davidson Sportster 1200 Sport
2003 Harley-Davidson Sportster XLH883
(This post was last modified: 11-15-2017 05:46 AM by SportsterDoc.)
11-15-2017 05:45 AM
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SportsterDoc Offline
1st Service Completed

southern Nevada
Posts: 61
Joined: Nov 2017
Post: #7
RE: Air box mod done
The two snorkel intakes total about 4.61 square inches.

The “velocity stack” area of the snorkel is about 4.90 square inches.

So, the snorkel restriction on the CB1100 is minor (~6%).

However, more out of curiosity, I used a hacksaw to remove the “cap”, abut 3/8” thick, from the top of the snorkel, directly above the “velocity stack”, then remounted the snorkel.

If I can get to the nearby mountains before the predicted 45 MPH wind gusts are forecast, tomorrow, I will advise if there is any appreciable difference.

The “cap” can be glued back on or the area covered with duct tape.

The only significant concern, on my part, is if I am caught in heavy rain…which seems to be a main purpose of the snorkel. Intake silencing may be secondary.

My 1967 CB160 would die in heavy rain, with an exposed factory air filter element directly under the side cover.

The CB160 was a daily ride, rain, snow or ice, from Feb-Apr 1967…then Uncle Sam sent me on an all-expenses paid vacation to Southeast Asia. But, at age 70, I have become much more of a fair-weather rider!

I am not set-up to post photos, but if an interested member would like to PM their email, I will send photos.

Recent bikes:
2018 Yamaha XT250
2016 Moto Guzzi V7II
2017 Yamaha TW200
2012 Triumph Bonneville
2002 Harley-Davidson Sportster 1200 Sport
2003 Harley-Davidson Sportster XLH883
(This post was last modified: 11-15-2017 05:08 PM by SportsterDoc.)
11-15-2017 05:07 PM
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Bheezy27403 Offline
1st Service Completed

Triad NC
Posts: 160
Joined: Sep 2015
Post: #8
RE: Air box mod done
I've been wondering about this as well. I have an open pipe (8" Delkevic) and with more flow out, more flow in makes sense. Granted my Bonnie is carb'd, but very big gains with open pipes and removed airbox/pod filters. Very interested in results here. Also, as know less than zero about FI, if the ECU can adapt to these changes without some sort of remap/flash.

Thank you for your service Doc.
11-17-2017 09:47 AM
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itstuantran Offline
Break-In Period

Vietnam
Posts: 27
Joined: Apr 2017
Post: #9
Photo RE: Air box mod done
(11-15-2017 05:07 PM)SportsterDoc Wrote:  The two snorkel intakes total about 4.61 square inches.

The “velocity stack” area of the snorkel is about 4.90 square inches.

So, the snorkel restriction on the CB1100 is minor (~6%).

However, more out of curiosity, I used a hacksaw to remove the “cap”, abut 3/8” thick, from the top of the snorkel, directly above the “velocity stack”, then remounted the snorkel.

If I can get to the nearby mountains before the predicted 45 MPH wind gusts are forecast, tomorrow, I will advise if there is any appreciable difference.

The “cap” can be glued back on or the area covered with duct tape.

The only significant concern, on my part, is if I am caught in heavy rain…which seems to be a main purpose of the snorkel. Intake silencing may be secondary.

My 1967 CB160 would die in heavy rain, with an exposed factory air filter element directly under the side cover.

The CB160 was a daily ride, rain, snow or ice, from Feb-Apr 1967…then Uncle Sam sent me on an all-expenses paid vacation to Southeast Asia. But, at age 70, I have become much more of a fair-weather rider!

I am not set-up to post photos, but if an interested member would like to PM their email, I will send photos.
Is this what you meant. I have cut the snorkel into 2 pcs and it does sound a bit difference.

       

And this is the one i'm going to buy to replace the stock snorkel
   
(This post was last modified: Yesterday 01:30 AM by itstuantran.)
Yesterday 01:24 AM
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