Well, only got it part done.  Got it all mounted, sniffer in the tailpipe up past the baffle, engine on... and way too rich at idle.  The stoichiometric air/fuel mixture, as you all know, is 14.7 to 1.  He likes to shoot for about 12 to 12.5 on the idle circuit.  Best we could get, even with playing around with the idle mixture screw, was 8.5.  No reason to try to fine tune it when the pilot is that far off.  We agreed that I needed to put the 52.5 back in.  I would have done it right then and there but I only had the main jets with me. The 52.5 stocker is the one that I took out of my jet baggie and took to show him a few weeks ago cause I was looking for a 55 with no bleed holes. So I came back home and tore up the car, house and garage looking for it but to no avail.  Crap!  

Gonna have to order another one, put it in and go back and try it again.

Here's something funny- the two intakes, K1 and K2, don't work the same with the same filter on them.




K2, the top one, was the one I was just testing the other day doing max up a steep hill.  No evidence of air restriction whatsoever.   

So this morning, before I head out for the dyno, I decided I'd put a foam filter on the K1 for the dyno run.  Remembering how sensitive it was to the resistance of filter material when I was experimenting with it, I thought I'd reduce the resistance of the foam filter.  The foam in the back of the filter is twice as thick as the sides.  I flipped the filter inside out and trimmed some of the foam in the bottom/back of the filter to minimize resistance.  Actually, I trimmed a little too much.  The center, as you can see in the pic below,  is so thin you can see the light through it.  It's good enough though for a quick ride and a dyno run.  


So, I put the K1 with foam filter on the bike.  Head down the drive way- no problem.  Turn on to the road- still going good.  First long straight road I find I twist the throttle about 2/3rds.  The rpms quickly climb then cough, sputter, cough.  What the heck?  Repeat and get the same result.  The foam filter is way to restrictive for the K1.  Yet it works great with K2.  

Question: does the K2 move sufficient air but the K1 moves maximum air?  My first thought was that there is a little less internal airspace in the foam filter on the K1.  But if should move air better with the back thinned out.  

your de-turbulation scheme causes very high "point velocities" in your airflow... the foam cant pass the air required quick enough.... the cylindrical shape as opposed to the hemispherical one of your original filter may have something to do with it... might be why you were so rich at idle, too....

but look at the installed shape... still cylindrical for the most part... imagine the holes through the filter as your de-turbulator straws on a micro scale... , now, let's also assume that the deturb actually draws the air from the filter in a linear manner (remember, the wind tunnels have the air being pushed though the honeycomb, but you have it being "sucked through").... which would have more "microstraws" pointed directly at each straws flowpath?

diamond jim wrote on 05/29/09 at 13:03:43:

Depends on the veloscity of the air thru the duct whether it is naturally laminar or turbulent.  In laminar flow, there's a veloscity distribution across the duct.  Air flows faster in the center then the edges.  The straws accomplish 2 things they dampen out turbulence and equalize the velocity across the duct.  I'll have to find my fluids text book someday.

diamond jim wrote on 05/29/09 at 13:03:43:

kinda... look at it more 3-dimensionally... if you were to run a straight line from any pore of the filter media pependicular to the inner face of the media, which filter shape will have the most lines pointed at a straight flow path from a straw? the hemi-shaped one, i would think... the deturbulator is a collection of intake planes, each of which acts as an individual, that's why it deturbulates... if a shop vac will pick up a screw while being held 2 inches directly above it, will it also lift one 2 inches to the side? not usually, in my observations....

diamond jim wrote on 05/29/09 at 13:50:34:

"hemi"-spherical...lol  the inertial differences is a valid theory too... might well be a combo of many differences "stacking" minor flow changes into a major difference....

verslagen1 wrote on 05/29/09 at 14:15:30:

but if it just barely overcomes the gravity linearly, will it have the "oomph" to overcome both simultanously(directly lift the offset screw), or will it drag the screw across the floor, then lift it from a position directly below the nozzle? that's with constant flow, not pulsed... if you just "bumped" the vac power switch on and off rapidly, would it overcome the offset screw's inertia at all? which shape of filter would give the pores of the media a more "bell shaped" orientation?