Air box mod done

[Spiderwatts_imp]

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)

[Nortoon_imp]

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.

[camoto_imp]

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.

[4 Paws_imp]

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.

[Gumby 1100_imp]

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.

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.

[SportsterDoc]

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.

[SportsterDoc]

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.

[Bheezy27403_imp]

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.

[itstuantran_imp]

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

[SportsterDoc]

"Is this what you meant. I have cut the snorkel into 2 pcs and it does sound a bit difference."

See post #23
[url=https://cb1100forum.com/forum/showthread.php?tid=11860&page=3]https://cb1100forum.com/forum/showthread...860&page=3