Custom intake tubes?

[MotoCreations]

I'm machined and made a few in carbonfiber (via mold) as well over the years for myself and customers.  Main thing that I've seen via the dyno on my own bikes is that the larger radius'd upper lip always generates better max rpm power.  Anything with a sharp lip on it -- not as good.  But as soon as you put an air filter on it, you need a proper edge for attachment for sealing purposes.

Thus why I usually use the sock-style pre-filter assembly with a skeleton wire support beneath to keep from sucking it down the intake. Never a problem with dust or water.  Essentially the pre-filter is to keep out big things that might muck up jets, block slides/butterflies open or rocks that might hit the valve/piston itself.

With my personal DesmoDevil, I'm running velocity stacks only with no sock pre-filter or anything.  The intakes are more protected by the wiring harness/tank enclosre then on a Monster, etc.  Never a problem in riding in dusty Arizona or elsewhere for the past five years.  A bunch of my customers run theirs the same way with EFI, FCR's or regular carbs. Everyone else uses a pre-filter sock due to the low clearance it requires.

note: we regularly run the F1 vintage racecars, vintage Ferrari's/etc for racing / road use without filters most of the time.  I honestly can't remember in 20+ years of getting anything stuck in the carbs/EFI/mechanical FI'ers.

One cavaet -- intake "honk" is really loud with velocity stacks only. (or with a pre-filter only)  Too much for some folks.  You are forwarned.

Second cavaet -- if your engine "burps" when cold (ala FCR's etc), the air/fuel get spit back out the velocity stacks and can cover things or light smoke out from beneath the tank.  With air filters, you almost never notice this happening.  You will without air filters!

As mentioned before, you do need to correctly adjust the air/fuel ratio via tuning.  Don't just slap on a set of open velocity stacks and assume your bike will run with the correct air/fuel ratio -- it won't.

[TiAvenger]

Second cavaet -- if your engine "burps" when cold (ala FCR's etc), the air/fuel get spit back out the velocity stacks and can cover things or light smoke out from beneath the tank.  With air filters, you almost never notice this happening.  You will without air filters!

Even on an injected engine?

[Duck-Stew]

Even on an injected engine?

Proper tuning applies to carbs and efi.  You'll need to get whatever you build/buy/decide upon properly tuned man.

[TiAvenger]

I meant the burping   


You should know that I should know better than that. 

[MrFryMoto]

how are you controlling fuel/air?

megasquirt micro?

[TiAvenger]

how are you controlling fuel/air?

megasquirt micro?

1.5 ecu with a flightcycles motocard.

I'm really not at that point yet. 

[gage]

  Anything with a sharp lip on it -- not as good.  But as soon as you put an air filter on it, you need a proper edge for attachment for sealing purposes.

ITG has filters with a proper velocity stack incorporated into the base. I bought a couple over the winter to do a pod setup on my 02 S4. It is going to wait until next winter when the engine gets rebuilt.

It would be the best of both worlds - Flitration and improved airflow/looks

[MrFryMoto]

ya know... now i'm thinking a set of aluminum stacks on the CB might be the way to go

[TiAvenger]

ya know... now i'm thinking a set of aluminum stacks on the CB might be the way to go

should I buy more metal? 

[MrFryMoto]

should I buy more metal? 

seeing as i can't find anyone selling any...
lets hold off  until the project can start again

[TiAvenger]

seeing as i can't find anyone selling any...
lets hold off  until the project can start again

Hurry up and move then. 

[MrFryMoto]

Hurry up and move then. 

i'm tryin' i'm tryin'!

[Langanobob]

megasquirt micro?

Excellent idea.  We need to add it to his list    Do you know anyone running one on a Duc?