Breva 11 air box removal

[Mike.C]

I've had an idea - a dangerous state of affairs I know but that's how it is when you spend a couple of days in "The Shed"

So question is: are there likely to be any diabolical consequences if I were to ditch the complete air box and replace it with 2 individual foam type air filters mounted directly onto the throttle bodies?

Basically where the two rags are stuffed into the throttle boday intakes in the pic below would go something like this:

Of course I would have to find a solution for filtering the stepper motor air intake (not hard) and the oil collector box drain (also not hard), and given that I am intalling Todd's full monty fueling PCV fix the fuelling should be taken care off.

BTW for those what might be wondering this is what a B11 looks like after two days of work doing a PCV / ECU swap / Stepper bypass surgery / Air box lid change / Inner spark replacement and a heap of general dicking about.

To explain, the real idea involves the fuel range on the Stelvio - seems to me that the space taken up by the monstrous air box is ideal for an additional fuel tank.... but that's a story for later on.

 

[GTM®]

Mike, it's been proven over the years that internal combustion motors like to pull from a still air plenums. That doesn't keep people from installing pod filters like you're suggesting. If you do, be sure to mount them on the plastic connectors that go into the air-box, pseudo velocity stacks if you will.
Filter media... I hope this doesn't go by means of Uni-foam-vs-K&N debate, please folks.

I do like your thinking on the Stelvio tank though. Need more info?

 

[Mike.C]

Thanks mate, that's probably enough info for me to get myself well and truly in trouble. Well then - back to the shed.

 

[guzzi jon]

Pod filters got a good rep in the late 70's, early 80's before the OEM's actually designed airboxes that optimized airlflow for the specific engine. you got an old bike, pods are good, you got a new bike, do the research. This is particularly obvious with the newer japanese sportbikes and I suspect with some of our beloved newer guzzi's Greg field got really interesting improvements in performance, but real improvments in mileage on his uber eldo with some fancy air feeding vs just slipping on pods..... Having said that, eliminating my air filter cover and snorkels on my griso has given the feel of improved top end.... and I know andrews griso with open airbox makes more horsepower than any griso with stock air box. but he kept the air box plenum and feeds, just removed the restrictions, I suspect if he put pods on the ends of the throttle bodies he would have killed his gains

 

[Series4]

Mike, dont remove the airbox, as previously said atmo engines prefer to feed from a plenum, my experience is that running just pods on a 'modern' engine upsets the low-medium speed running in day-to-day use. If you want to fit a pod fit it upstream of the airbox. For the Stelvio why not make (or have made) a custom 'Dakar' tank that uses up the glovebox space? If you need one, hundreds of other Stelvio owners will want one and perhaps that's enough demand to make it worthwhile for a local manufacturer?

Peter

 

[Penis Rotor]

Even if there was an advantage the amount of fuckwittery and embuggerance you'd have to go to would make it a complete pain in the arse!

Any *Gains* in air flow that you would achieve would simply upset the AFR. Now you have the PCV+AT I believe so these would be compensated for but the actual *gain* you'd achieve would be so small as to be virtually undetectable unless you used a dyno to get figures.

Thing is the stock system works OK. Really, if you want more? Get a Sport 1200 8V.

Pete

 

[Mike.C]

Ok I hear you about the no power gains, but that's not what I'm after - what I am interested in is space for a fuel tank in the Stelvio, and what I am wondering is if there will be any major issues with the engine.

From what I can make out, maybe some minor detrimental effects but I am hoping these might be countered by the PCV and auto tune.

I recon that after I've got the PCV settled in I might give it a go, I had a squizz this arvo, an I recon it would only take about half an hour to take the box out and re-route all the pipes and stuff. We shall see.

 

[kmartin]

Make sure you get one green and one red as in the picture. Green would go on the right ahnd cylinder.

 

[GTM®]

Make sure you get one green and one red as in the picture. Green would go on the right ahnd cylinder.

You may be onto something Keith, but you have it backwards;

 

[draidt]

BTW for those what might be wondering this is what a B11 looks like after two days of work doing a PCV / ECU swap / Stepper bypass surgery / Air box lid change / Inner spark replacement and a heap of general dicking about.

For those of you wondering, this is what a Norge looks like before Guzzitech's Full Monty treatment, including fuel pump filter and level sensor replacement. Just above the ABS button is the ECU about to be maneuvered into place.

With Air Box reinstalled with CNC open air box lid.

PCV and AT in place.

You going to love the results !