Bored, so I made some carbon...

[jesse370]

YO, master of the universe...I don't think everyone knows about that whole....psycho cutting that poor kids head off while he slept and then carrying it around on the bus......

take a deep breath...

[He Man]

yea your probably righ. People dont like gore around here.
edit: or  make the beast with two backsed up world.

[jesse370]

yeah, still blew me away when I read that.....

canadians are crazy man....


BUMP for some pics

[billg69gmc]

I had some thought on this air box situation. A bigger air box will contain more initial static air. Once the engine is running, negative pressure is established based on the restriction of the air filter. If you incorporate a bigger filter with a bigger air box you would get less negative pressure since more air can move throw more air filter. I would gather that the same sized air box with more square inches of air filter would accomplish the same as increasing both. As soon as you drop the hammer, that pressure inside the air box is regulated by the air filter. If two pods have more surface area than a single square K&N filter, then pods would move more air. I know on my ST, the stock box cover has two intact tracts. When I put the DP open air box kit, it made a big difference in response. To me logically the next limiter on air intake would be the amount of surface area of the filter. At least that's how it seems to work out in my mind. My guess would be if someone Dyno-d with filter on and filter off would answer the question. Has anyone done that?

[He Man]

you forget the way a twin engine behaves. Theres a lag time between each piston firing, in that time the airbox doesnt have much pressure, instead the it fills up back up to its static size. when the next piston is in its intake stage, it draws that bit of air again. If the amount of air that the piston draws in equals to the size of the airbox, then having a larger airbox would be essentially useless without a ram air setup.

If the amount of air that the engine sucks induring the intake stroke is greater than that of the airbox, than increasing the size would benefit. why? because its easier for the engine to grab static air than it is to create a vaccum and suck in new air through the filter (which is where a larger area would come in handy).

The issue with Pod filters is, you completely loose that airbox's static supply. Instead you have about as much voulme as 2 toliet rolls of air, more if you get a larger filter with a larger interior voulme.

Some questions you need to ask and research is, how much surface area is there on the pod filters? I assume its doubled. If my assumption is right, does doubling the filter surface area make up for the lost in static voulme? aka, becasue there is more surface area (which leads to less resitance to pull a fixed amount of air) will it make up for voulme? Its hard to answer it since im not an engineer.

Furthermore the TPO kit come with velocity stacks that changes the way air is sucked in. depending on the length and shape of the curve on a velocity stack, it can shift the power higher up or lower in the power band. TPO has dynoed their bike, there is an increase in top end only. If these results are true, than the TPO airfilters does indeed make up for the lost of voulme in the airbox (since there is no power lost and the power band remains the same at the lower rpm range). If it didnt, there would be less air going into the chamber and less fuel, therefore less power.

Regarding your statement about a larger filter with the same size box. you already have that. with an open airbox, you have the larges filter the box will fit so the point is moot unless you somehow make a larger filter fit

[Capo]

positive airbox pressure past, say 50 mph.

You will not get positive pressure in the airbox at 50mph, more like 120.

[billg69gmc]

you forget the way a twin engine behaves...

Regarding your statement about a larger filter with the same size box. you already have that. with an open airbox, you have the larges filter the box will fit so the point is moot unless you somehow make a larger filter fit

Good points. Definitely an interesting subject!

[hypurone]

You will not get positive pressure in the airbox at 50mph, more like 120.

Sportrider did an extensive test and write-up on the Kawi ram-air system on a ZX9R. With a millibar pressure sensor and some other gauges they were able to see positive pressure at speeds as low as 70-80mph! Kawi was the first to use ram-air in a prod bike and has developed it far more than anyone else.
Most other systems may be as high as 100-120 befire realizing anything, it is ALL in the design. Which explains why my 9 could catch and overtake larger displacement bikes, especially at speed.

The system on the 7, 9 etc is very extensive (adds weight) and fairly complex. While it may seem as simple as running intake tubes to the front of the bike, you really need to find the high-pressure point at the nose and focus it to realize any gain. You can get some easier gains by having the system draw cooler air from the front of the bike rather than hotter air up under the tank but either approach requires a completely and well sealed/insulated intake system.

just my nickels worth...

[Alexandre]

PICTURES!!!

[He Man]

you mean pictures of the test Hypurone did? here they are.

This is of a 4cyl jap bike


and this is of a twin.


Sorry i knew you ment the carbob fiber airbox. heh

[Howley]

Would it be of any benefit to move the filter from the middle of the airbox to the lid of the airbox?

[55Spy]

Now what do you think? If you still dont know. What has more area? 2 toilet rolls? or a big square box?

Do I get to unroll the toilet paper rolls?

On subject..... you all are thinking of the filter as unable to pass any air to contribute to in the intake cycle...not exactly sure thats the case but the volume of air already past the filter would be less restricted on inital movement.

[DesMotion]

I was doing a little reasearch on DIY CF the other day myself and I found a pretty good article here.

http://www.webbikeworld.com/t2/carbon-fiber-motorcycle-parts/

Wow, that is a good article...

And I have 500 or so air boxes. I would be interested in donating one if, of course, I get one in "CF".

[TAftonomos]

I didn't see the thread, so I started another one.  Maybe someone can merge the 2 into 1?

http://ducatimonsterforum.org/index.php?topic=9322.0


How much would an airbox cost me outright if I just wanted to buy one.  I don't mind giving a discount on something like that, but I don't like to owe work to someone either.

[jesse370]

All the owners of Rs monsters are crying out for a nice carbon box