Air intake mod. - Wrist Twisters
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post #1 of 43 Old 01-22-2017, 12:43 AM Thread Starter
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Air intake mod.

Waiting on some parts to get bike running again and got bored so did this. I had a spare airbox intake lying around.
I've done the flapper mod on my bike already. I had the air intake off my bike since I am removing the vacuum switch and am fibreglassing over the hole. I had a thought why not remove most of the snorkel. I've now done that to a spare I had. Have not started or ridden bike so don't know what it will do to the running of the bike yet. If its stuffed it up I'll swap it out.
I was curious if that length snorkel was for some specific airbox tuning or is just to accommodate the vacuum switch and flap.
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post #2 of 43 Old 01-22-2017, 06:09 AM
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On my old 919, i simply took a hole-saw to the side of the air box. The hole probably didn't do anything, but I thought it looked kind of cool.

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post #3 of 43 Old 01-22-2017, 06:31 AM
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I have a custom intake on mine and it runs great. Most people will try to argue that the bike was designed the way it was for a reason. But my 919 runs like a scalded dog and I have no starting/ stalling or idling issues

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post #4 of 43 Old 01-22-2017, 06:57 AM
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Originally Posted by redline919 View Post
I have a custom intake on mine and it runs great. Most people will try to argue that the bike was designed the way it was for a reason. But my 919 runs like a scalded dog and I have no starting/ stalling or idling issues
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post #5 of 43 Old 01-22-2017, 08:24 AM
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post #6 of 43 Old 01-22-2017, 11:38 AM
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I'll be getting my bike dyno'd soon so if I'm going to mess with the airbox I should probably do it now. Is there some middle ground here? Like just removing the cover and making something to hold the filter in place?

Your rims look sweet Mike, do you have any more shots?

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post #7 of 43 Old 01-22-2017, 01:11 PM Thread Starter
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Redline919 how did you make that intake mod? Any up close pics? Also nice lookin bike. I like the blacked out look. When I got my bike it was red. It's now gunmetal black. Once you go black....

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post #8 of 43 Old 01-22-2017, 01:37 PM
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Quote:
Originally Posted by Auron View Post
I'll be getting my bike dyno'd soon so if I'm going to mess with the airbox I should probably do it now. Is there some middle ground here? Like just removing the cover and making something to hold the filter in place?

Your rims look sweet Mike, do you have any more shots?
Not my bike. Click in the link and there are lots of pics.

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post #9 of 43 Old 01-24-2017, 07:36 PM
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You can do anything to that air box. It isnt going to dyno any different.

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post #10 of 43 Old 01-24-2017, 09:28 PM Thread Starter
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This is my stock intake. Flapper and metal switch completely removed and hole fibreglassed over.
Bike still not going so haven't tried out the shortened snorkel yet. I'm thinkin they are 50mm longer than they have to be, simply to accommodate that flapper.
The longer the snorkel the closer the air intake is to the hot exhaust pipe. It may keep the intake air cooler, in some situations. It might stuff something up. But It'll propably do bugger all except keep me entertained while bike is broke.
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post #11 of 43 Old 02-20-2017, 09:12 PM Thread Starter
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Whoops!
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post #12 of 43 Old 02-20-2017, 11:03 PM
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Looks cool where did you get that mesh thingy ?

I'd be interested in one of those for my bike too

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post #13 of 43 Old 02-20-2017, 11:50 PM Thread Starter
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I had a spare intake snorkel lying around. Just did it for fun and looks. If it stuffs up how the bike runs I'll swap it out.
The mesh thingy is a cut down stock intake snorkel, they can be split in half. Over that I glued a gutter downpipe connector. 3 inch PVC plastic, shortned. Over that I glued a cut down ebay velocity stack, 3 inch aluminum. Inside the stack,sitting on the PVC connector is some poly mesh. Everthing glued up with a black marine adhesive, Sika. It can be painted. Which I did. It also sticks like s**t on a blanket.
Basically it's some backyard ghetto mod. The model before had a 90 degree bend and a 3 inch diameter snorkel facing forward. Bike took a lot longer to warm up, when moving, and at high speeds the engine had a weird feel like it was surging a little. So I went in this direction. Haven't gone hard on this one yet cause I'm waiting on a tire so can't say what it's like at speed but bike starts fine and cruises about nice.

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post #14 of 43 Old 02-21-2017, 07:59 PM
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calling @EscapedLabRat... do you still have your 3d printer? could print a nice mesh plug type thing for this. Or a little hornet on the front :P

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post #15 of 43 Old 05-08-2017, 08:22 PM Thread Starter
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I have been using this modified intake for about 2 months now. The bike is running fine. I don't think it's had a negative impact on performance. I'd like to say it's pulling a bit harder and possibly running a little cooler. Friggin looks cooler! Definitely louder at the intake. Still using stock air filter.

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post #16 of 43 Old 01-11-2018, 04:39 PM Thread Starter
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Ewmin3m. I woke up this thread to post a pic for you.
It sux that photofucket isn't working cause all the good pics have gone. I went looking on Google for this.
This is what someone else did and what I did to my air intake snorkel to allow for attachment of velocity stack. The snorkel has a seam and can be split length ways. The rest was cut and sanded.
I'll have a crack at a new model this winter and I'll take lots of pics.
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post #17 of 43 Old 01-11-2018, 06:32 PM
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Are you running that plastic grid over that opening? Those grid bars are way too thick. Why not just have a thin wire mesh. Those cold be cutting 1/2 the flow. Might not even really need one.

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post #18 of 43 Old 01-11-2018, 07:00 PM Thread Starter
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Quote:
Originally Posted by KarlJay View Post
Are you running that plastic grid over that opening? Those grid bars are way too thick. Why not just have a thin wire mesh. Those cold be cutting 1/2 the flow. Might not even really need one.
I had the same concern. Too thick, cutting flow.
I put the mesh there because I didn't like the look of a dark void. Also loads of bugs and grasshoppers here.
I'm in the process of knocking out another one with a light stainless mesh. Just got to find some suitable mesh. Thanks for the input.

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post #19 of 43 Old 01-11-2018, 07:16 PM Thread Starter
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A pic of a open style intake mod and my mesh job for comparison.
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post #20 of 43 Old 01-11-2018, 08:08 PM
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cool thanks. I'll be waiting until you manage to document everything. I think i'd like the finer mesh version a bit more

Similar to the chain sprocket cover over the left pic lol

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post #21 of 43 Old 01-11-2018, 10:34 PM
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Quote:
Originally Posted by Islandboy View Post
I had the same concern. Too thick, cutting flow.
I put the mesh there because I didn't like the look of a dark void. Also loads of bugs and grasshoppers here.
I'm in the process of knocking out another one with a light stainless mesh. Just got to find some suitable mesh. Thanks for the input.
Some of the old car air cleaners had a kind of high flow mesh. If you go on Amazon, you should be able find something that'll have the size and spacing you want.

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post #22 of 43 Old 01-11-2018, 11:11 PM Thread Starter
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Great minds think alike! Ha..
I found this mesh on an old truck air intake today. I've pissed that black mesh off and just sat the stainless in there for now. Think I'll just use black silicon to hold it in place for now as I might get a slightly more open mesh from eBay or something. You can't see it but it's resting on and tucked behind a shallow internal rim. Just needs a little silicon for now to tidy up and stop from coming out.
I feel a more open mesh might be better. Dunno.
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post #23 of 43 Old 01-12-2018, 12:29 AM Thread Starter
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I ran a thin bead of black silicon around the edge of the mesh. The thin groove that the mesh is pushed into also had a bead of silicon. I'll run this until I find the next size up in the mesh.
Anyone know how to cut stainless mesh neatly, in a circle. Sharp tin snips? The piece I used was already a perfect size circle. Lucky.
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post #24 of 43 Old 01-12-2018, 01:59 AM
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One quick and easy test to see if it hinders flow is to simple ride with it then without it. Do some runs and see if you can tell the difference. It's hard to tell, but that mesh looks a bit finer than what I was thinking. I was thinking of thin wire maybe 1/4" spacing, just enough to keep out the larger bugs.

This reminds me that I'm due to clean my air filter
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post #25 of 43 Old 01-26-2018, 08:30 PM Thread Starter
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I'm trying out a larger mesh size. Bike runs fine. I like the look of bigger mesh size although I'm not happy with my silicon job. It looks like poo.
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post #26 of 43 Old 01-26-2018, 11:59 PM
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Yeah it looks more like mesh now.


Will you paint it black? if possible?



Quote:
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I'm trying out a larger mesh size. Bike runs fine. I like the look of bigger mesh size although I'm not happy with my silicon job. It looks like poo.

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post #27 of 43 Old 01-27-2018, 12:30 AM Thread Starter
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I think I will paint it black. I'll tidy up the silicon a bit and maybe spray it all the same metallic gunmetal black as the bike.
It won't look so much like a sink strainer either if it's black.
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post #28 of 43 Old 01-28-2018, 01:39 PM Thread Starter
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Paint it Black.
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post #29 of 43 Old 01-29-2018, 11:38 AM
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That looks great :P


Will you consider doing a group buy :P ?

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Paint it Black.

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post #30 of 43 Old 01-29-2018, 02:19 PM Thread Starter
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I tell you what. Let me make up a new one, over my winter, and you can have the one you see in the pic.

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post #31 of 43 Old 01-30-2018, 12:28 PM
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NICE :P

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I tell you what. Let me make up a new one, over my winter, and you can have the one you see in the pic.

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post #32 of 43 Old 01-30-2018, 06:21 PM
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Islandboy,

You said you bought the velocity stack off of e-bay? Do you remember the brand or part number? And what is the internal and external diameter?

Thanks

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post #33 of 43 Old 01-30-2018, 08:45 PM Thread Starter
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OK. I'll post some ebay links to stuff that's similar to what I used.
Bear with me. I have a mild retardation towards anything computers. I can only paste a link a time.
This is the type of fitting I glued to the base, snorkel, to which I shoved a velocity stack onto. I cut it down to about 20mm high.
http://www.ebay.com.au/itm/292367886411
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post #34 of 43 Old 01-30-2018, 08:51 PM Thread Starter
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Next. This is the same type of velocity stack I used, cept mine was black.
I also cut this down. It's diameter starts out at about 72mm. I cut it where it had expanded to about 75mm. It's the right height to clear the bikes side panel and a tight fit onto the previous 75mm fitting. This leaves an inner lip that the mesh sits on and into. All glued up.

http://www.ebay.com.au/itm/162818201362
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post #35 of 43 Old 01-30-2018, 08:57 PM Thread Starter
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One more for you to consider.

Stainless Steel Blue End Cold Air Intake System Velocity Stack Kit Turbo Horn Funnel Kit 76mm 89mm 102mm
http://s.aliexpress.com/ayI3e6BB
(from AliExpress Android)

It's already the right diameter to fit over the 75mm gutter outlet. Mostly straight sides so possibly could be cut anywhere to suit. Could be too loose?
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post #36 of 43 Old 01-31-2018, 12:21 AM Thread Starter
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I took some more close up pics this afternoon.
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post #37 of 43 Old 01-31-2018, 11:16 AM
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@Islandboy,
I just did your original intake mod that is the first post but the bike is still put away for the winter here in Illinois so I canít try it out yet.
If you get good results from your velocity stack mod I might try that next but I am not very good at fabrication.

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post #38 of 43 Old 01-31-2018, 11:54 AM
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This looks great :P


Quote:
Originally Posted by Islandboy View Post
I took some more close up pics this afternoon.

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post #39 of 43 Old 01-31-2018, 02:36 PM Thread Starter
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Quote:
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@Islandboy,
I just did your original intake mod that is the first post but the bike is still put away for the winter here in Illinois so I canít try it out yet.
If you get good results from your velocity stack mod I might try that next but I am not very good at fabrication.
The bike runs great with the velocity stack. The bike also has a pc111usb. I think it's important as the bike needed a good tune after changing to wide open pipes. The velocity stack and K&N filter definitely let the bike suck air easier. I wouldn't normally go for a K&N air filter. I tried one in the bike when I was running stock pipes and delkevic cans. At low revs my bike ran poorly. Now though with loud open cans the K&N filter is fine. All tuned up with a pc111usb of course.
You don't need mad skills to fab up a velocity stack. Some look to be just a hole cut into the snorkel with a velocity stack shoved into it. See pic. I couldn't work out how the stack was held in there. Maybe glued from the inside. This option looks simple to do. I may try it with the second stack I'll make.
I cut my snorkel right down so I could mount the gutter outlet as a base to fit the velocity stack onto. This also allowed me to line the stack up central to the air filter inlet.
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post #40 of 43 Old 01-31-2018, 04:27 PM
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Great job! Thanks

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