Pods Vs Air Box. Dyno and Road Testing

[greenmonster]

Dunno in details why the Kämna adapters didn`t fit airbox. To me, they look like they wouldn`t fit air box only w/o any more rubber fittings.
Friend fiddled 3 long nights w the carbs & ended up w stock airbox & stock rubbers.

[That Motorcycle Show]

I have a 2002 620ie dark. I want to take out my air box and replace it with two K&N's. I was looking at it this morning and noticed a hose that is attached to the air box and runs to the back of the seat into a plastic bladder/box. I was wondering if I need to or should add a fitting that would run into a spacer between the filter and the velocity stack. This may sound strange but I will take pics. Does anyone know if this will work for my 620? Thanks.

[junior varsity]

That is your crankcase breather setup. For best performance, it ought to be there - but you can do away with it all together to clean things up. More info on it can be found by searching: crankcase, breather, vacuum, Pressure, vent, oil, mist, etc

[That Motorcycle Show]

Thanks JV! How you been? Did you leave Texas? When do you find out the test results? I was thinking that I could add the crankcase tube to the tube that I will add to the adapter to fit the K&N's to. Kind of a t-bar effect. the hose would be breathing into the velocity stack. Does this make sense?

[H-2 CHARLIE]

dont most use a 1 inch hose with a KN mini ?

[ducatiz]

dont most use a 1 inch hose with a KN mini ?

they do until the oil pressure sprays a bunch up into the filter.  if you have to use that setup, it should be with as long of a hose as you can put under there. 

[That Motorcycle Show]

I was thinking that I would keep the length the same and just add a K&N mini like suggested above. Do you think this would work? I was going to mount it in the same area as the air box.

[junior varsity]

that is better than trying to branch it into the pods/velocity stacks - the v-stacks are supposed to be uninterrupted flow area - smooth flow from there, through the carbs/throttle-bodies (whichever applies), through the shortest straightest intake manifolds into the heads where it is again, the smoothest, straightest path to the back of the valve (ideally).   the "in" for the intake air path is the velocity stacks, which should gradually taper into the throttle bodies - think of the "bell-mouth" of a trumpet.   Likewise, the "out" for the intake air path (into the head/cylinder's combustion chamber) should get a nice smooth 'bell-mouth' shape (hence 'multi-angle' valve jobs for performance) - again like a trumpet/tuba/baritone/trombone's bell. Not like the abrupt ending of a flute.

[koko64]

Good to have you back on deck j v.

I was thinking about a T piece into pods at one stage with the hose entry into the plastic face of each pod. But I went nah, I"ll put the air box back on and stick a mini K&N on the oil seperator box. Clean air into the air box, and with shortened stacks the best performance.

In the end I tested and decided.

The next best set up is a bigger, better air box. I want see if I get the filter to be at the very top of where the stock air box lid would be. I'm going to get an old air box lid and see if I can glue/plastic weld a filter frame into the top of it before I open it to get some more volume.. It'll be a cheap experiment and reversable with bits from mates and the wreckers.

[That Motorcycle Show]

Thanks guys(JV) I will take pics of my progress. I just bought a mini filter for the crankcase line and will get the filters in the mail on Monday.

[junior varsity]

Good to have you back on deck j v.

I was thinking about a T piece into pods at one stage with the hose entry into the plastic face of each pod. But I went nah, I"ll put the air box back on and stick a mini K&N on the oil seperator box. Clean air into the air box, and with shortened stacks the best performance.

In the end I tested and decided.

The next best set up is a bigger, better air box. I want see if I get the filter to be at the very top of where the stock air box lid would be. I'm going to get an old air box lid and see if I can glue/plastic weld a filter frame into the top of it before I open it to get some more volume.. It'll be a cheap experiment and reversable with bits from mates and the wreckers.

i'm doing some learning about the setup on the 851-888-926 (corse/corsa models and factory models) and will divulge what i learn promptly.

[koko64]

Will there be some transferable mods considering the similar frames?

[talljoker]

So for EFI does this effect me as much as the carbs? Also what is the easiest setup if I want a loud annoying monster...

[Monster750ie]

So for EFI does this effect me as much as the carbs? Also what is the easiest setup if I want a loud annoying monster...

Cut your mufflers off

[ducatiz]

So for EFI does this effect me as much as the carbs? Also what is the easiest setup if I want a loud annoying monster...

Cut your exhaust headers down to about 2" -- 2" from the exhaust port.

Weld a kazoo on one port, and a duck call on the other port.

It will be the loudest, most annoying monster EVER!