Airbox modding

[mik_str]

Pretty simple Joe, looking to help the engine breathe better.....

[mik_str]

modded filter pics below.....





I just fired it up in the garage and let it run for 10 seconds... no stumbles or anything, will take it for a ride tomorrow.....

As I had the camera out and lid removed, snapped a few of it as well (can see the opened up snorkel and two 1" holes, one per side).....

[mik_str]

and now, the second generation modded airbox (cleaner, less cluttered)....

[mik_str]

No signature in the corner either.... lol

[tony.mon]

And yeah, what about those goldwings and vfrs that have fans that fight the natural airflow direction and cause overheating? What were Honda thinking then?

The fan direction is designed to work when stationary, and blows hot air out and away from the engine, air intake for the airbox, and riders legs. Once you're rolling the air flow will cool the radiator anyway, so the fan isn't needed.

Easy, innit?

[tony.mon]

modded filter pics below.....





I just fired it up in the garage and let it run for 10 seconds... no stumbles or anything, will take it for a ride tomorrow.....

As I had the camera out and lid removed, snapped a few of it as well (can see the opened up snorkel and two 1" holes, one per side).....

But now you have the holes in each side, the internal blade is pointless, as air will flow in from all directions.

I tried this myself with various sizes and placements of holes in the top lid, but got the same effects as trying to run it with no lid at all- horrible.

Let us know how you get on....it may not get you more power but at least you get to listen to a great intake roar as you wind it on.....

[VTRDark]

Interesting concept with the filter that. A combination of the benefits of the BMC along with the plastic dam (whatever it's called) type thing of the original across the top. And the filter element sitting higher. I'm wondering what that would be like at the height of the standard filter element on a standard bike. Basically juts swapping the paper element for the BMC.

(:-})

[darkember]

Also where have you terminated the breather pipes from the cam covers?

[lloydie]

tested the modified snorkel lid today with standard air filter after a base run with a normal lid and there wasnt any difference at all .

also tested the no lid and standard air filter , it made better power to 5k then ran very lean so lean the run was aborted .
so if i run much larger mains about +5 sizes up it should make better power .
more testing next time .

i will up load the chart tomorrow

i still want to test a spacer mod with a standard filter but more tinker time needed ,

[tony.mon]

tested the modified snorkel lid today with standard air filter after a base run with a normal lid and there wasnt any difference at all .

also tested the no lid and standard air filter , it made better power to 5k then ran very lean so lean the run was aborted .

Interesting, that lends support to the snorkel restricting airflow theory.

No lid with a K+N is rough everywhere, same with MWR, which is apparently designed to run like that.

[mik_str]

I have been running with that lid for over four years now and reverting to a stock lid netted me a loss of 2.5 hp and 2 lb-ft of torque (this was a few years back now; promptly put it back on and have been running like this ever since.......); runs very well at the moment to be honest..... this is basically experimenting, if I get a gain, great, if not, oh well.......

[8541Hawk]

tested the modified snorkel lid today with standard air filter after a base run with a normal lid and there wasnt any difference at all .

also tested the no lid and standard air filter , it made better power to 5k then ran very lean so lean the run was aborted .
so if i run much larger mains about +5 sizes up it should make better power .
more testing next time .

i will up load the chart tomorrow

i still want to test a spacer mod with a standard filter but more tinker time needed ,

This is why the HRC kits came with a "B" needle which has a fatter mid-range than the "A" needle.

[lloydie]

Red line no lid (has possibilities)
Blue line opened snorkel .
Green line 1st base run
Pink 2nd base run needles dropped 1 washer .

[mik_str]

in fitting the (first) modded filter, I added a 6mm shim above the filter (to lift lid). Despite this, the raised filter was touching the lid at the back (preventing the box from closing). So, I beveled the back end (the silicone-ish red substance which holds everything together) with an exacto knife and got it to fit. However, giving the matter some thought, I decided to take it out and drop the filter slightly (6mm, height of shim). In taking it apart, I noted that the black RTV silicone I used to seal everything up did a great job of holding the filter to the base, so I saw an opportunity to get ride of the tabs I had used to "weld" the filter to the OEM base (can't see how they would NOT have created turbulence). So, in total, I dropped the filter about 9mm and beveled the edges all around. I will be keeping the spacer above the filter as fit at the back will still be a bit tight, so the extra 6mm will help there.

While I had everything out, I made some quick calculations and found that the "hybrid" filter, in addition to creating more open "headspace" above the stacks, also creates just over half a liter of volume in the post-filter area (making it readily accessible to the engine as it begins draws air on the intake stroke; located directly above the entrance to the stacks, it's in the best possible location). The shim above essentially gives the volume back (my calculation indicate both work out right at 540cc.... ironic). So, without further ado, here is 2nd gen filter (FWIW, we can move from one prototype to the next phase quite quickly as we're a small organization, lol)

cheers

[lloydie]

Looks much better . When's the test ?