| Author | Message | ||
     Peel |
I was checking around the net and saw these intakes. Does anyone have one on there bike? http://www.aussiebuellriders.info/deviltube.htm | ||
| Trojan |
We are working on a system that is pretty similar to that. Ours will be a two piece billet velocity stack, with a seperate base unit and screw in stack. The stack itself will be available in differing lengths to optimise power at different rev ranges. The final kit will include an air filter 'hat' to replace the inner airbox cover as well. Initial tests with the XB9 prototype indicate some very good seat of the pants results  We will have some dyno figures soon.   | ||
| Scitz |
The biggest advantage I can see from the stock stack is that the aluminum stack will not change shape. Heat and amount of air coming in can probably change the shape of the rubber. It may be by small amounts but a few .001’s of an inch can make a difference. | ||
| Jerseyguy |
The Phoenix has arisen! lol My CNC'd stack was tested @ Tilley's HD last year and yielded EXACTLY the same results as the rubber one.  | ||
| Aussie_buell_riderz |
(Message edited by aussie_buell_riderz on April 17, 2005) | ||
| Alex |
Go and get a flow bench first. You will be surprised how much CFM the stock rubber stack can flow. Best regards Alex M-TeK Engineering | ||
| Scitz |
So, I guess that we can at least come to the conclusion that any aluminum stack that retains the same dimensions as the stock rubber stack will not have any improvement? | ||
| Aussie_buell_riderz |
(Message edited by aussie_buell_riderz on April 17, 2005) | ||
| Alex |
Scitz, we can even come to the conclusion that no aluminum stack - no matter what shape it has - will outflow the stock rubber stack in conjunction with stock heads as the stack is not the limiting factor but the head (assuming that the air box including the filter has been removed completely). That said it does not mean that one can´t influence the shape of the torque curve by using different length stacks. But this fact is more related to intake tract length tuning rather than maximum air flow. Best regards Alex | ||
| Wyckedflesh |
ABR, not to be a pain, but I notice the dyno run listed is a "simulated dyno run" do you have actualy dyno runs as of yet or do you plan to have some done down the road? I am not trying to doubt your credability, just looking at the piece and arrangement, I am certain it will have some affect, it has just been my experience with the simulated dynos that they just don't have the same final curve as an actual on bike dyno run. In my experience its been fifty fifty as far as better or worse. I am also curious if you have plans to make one for the larger throttle body of the 12 for use without the valve control but with use of an after market exhaust. I am really impressed with your pricing and also wonder if your price is in $AU or $US. Thanks. If you wish to answer me off the badweb to avoid sponsor issues that will be totally acceptable. wyckedflesh at hotmail dot com | ||
| Aussie_buell_riderz |
(Message edited by aussie_buell_riderz on April 17, 2005) | ||
| Norrisperformance |
Doesn’t look like you’re a sponsor . And if your not, you need to talk to Blake before you continue. You have to pay to sale here. | ||
| Norrisperformance |
Aussie_buell_riderz You and peel wouldn't be one in the same would ya? | ||
| Norrisperformance |
Aussie_buell_riderz The power loss your talking about can be fixed with a Drummer. And end up with more performance everywhere. lol | ||
| Aussie_buell_riderz |
(Message edited by aussie_buell_riderz on April 17, 2005) | ||
| Blake |
Using a steady state HVAC ductwork analysis routine to design a component for a highly transient flow system with Reynolds values through the roof compared to those in HVAC systems? Ohhhhh Kayyyyy. "Engineer" you say? Really? A sharp edged intake with another sharp change in surface contour in the throat? Ohhhhh Kayyyyy. You did say "engineer" right? Does airflow really like better to negotiate those sharp edges versus gentle curves? Mechanical Engineer you say? Professional registration/certification number please. Oh brother. Okay, I'll bite, please explain how a sharp edged intake with a surface discontinuity in the throat area is superior to a gently curving venturi type (optimally efficient) intake. Please keep in mind the law of conservation of momentum as it applies to subsonic airflow. Or, you can just go away and try to scam this upon some poor fool somewhere else. BTW, you are in direct violation of the policy to which you agreed when joining this discussion forum. Does that bother you? It bothers me; on account of I'm the chief custodian of the place charged with enforcing the policy.  | ||
| Blake |
The stock intake is venturi shaped to restrict emissions? BWAHAHAHAHAH! Please, no more! Oh brother! | ||
| Apex_assasian |
blake fires one across the bow......i love when he does this...my hero. | ||
| Diablobrian |
I do believe blake hit it right on the head. We seem to have a fraud trying to impress the wrong crowd with fancy diagrams and charts....never mind the science involved. | ||
| M1combat |
Yeah, you'll need to take that angle down to seven degrees at the most... Hey, if you sponsor the site we might help you design your part... I doubt you will though. You know, coming on here and showing us something that looks cool but doesn't really seem to make a lot of sense is a lot like insulting our intelligence. You've run into a fairly dense population of folks who have their heads screwed on straight. I think you can sell through a sponsor, but I assure you, any of the sponsors will need a sample that they will thoroughly test. It needs to be proven to be sold to this crowd... Most of us aren't exactly into wasting money. | ||
| Jerseyguy |
Blake - You need to be a little more direct and not beat around the bush so much..... That Corey dude disappeared last year - Did he move down under? | ||
| Opto |
please explain how a sharp edged intake with a surface discontinuity in the throat area is superior to a gently curving venturi type (optimally efficient) intake Blake, are you saying some of those English road race bikes from the sixties/seventies had tuned length intakes on them just for fun? | ||
| Opto |
Would be interesting to see a dyno with and without the stock stack, just to see if it actually does anything at all. | ||
| Ingemar |
I still think it's a shame we never got to see those dynosheets from the velocity stack challenge Mark did. Quoting hp's and lb's is just not the same as looking at a nice curve I guess. | ||
| Blake |
Steve (Jerseyguy), I know. I'm too much of a softy. ![: ]](http://www.badweatherbikers.com/buell/clipart/proud.gif) I'll work on that. Seriously though, if it had been just one of the three problematic behaviors, I would have let it go with a friendly comment, but posting under two different usernames, promoting non-sponsor wares, combined with perpetrating what I perceive as a scam were just too much. Hammer time.  Of course if I am wrong about the man and his motives, I'll apologize. He may simply be a bit over-enthusiastic and naively so. He's free to rebut here as he wishes. Opto. I don't know the details of what you mention, so it's tough to address your point. I did not mean to imply anything about a tuned length intake runner being ineffective. The length and the geometry of an intake tract are important features that do indeed affect performance. Though please note that within the bounds of OEM configurations, they are not nearly as important as the optimization of the exhaust tract geometry. Not even close. Someone mentioned the 7 degree angle rule of thumb wrt the sharp angles of which I was critical. That rule of thumb for the design of aerodynamic surfaces applies to the prevention of separation of flow on surfaces in a free stream, like for the faired surfaces of a motorcycle. It does not mean that a sharp angle of 7 degrees or less is as optimally efficient in ducted flow compared to a smoothly contoured venturi-type configuration, on account of it ain't. Ingemar, Mark still has those dyno charts. He sent them to me back then but unfortunately he sent them to an old email address that I could no longer access. He's a very busy man. I'll see if I can get him to send them to me again so I can post them; on account of I agree with you. He did do a pretty good job of describing the overall affect of each configuration he tested. My comment though was that it would have been really nice to also have tested the stock intake with the newer airbox lid. | ||
| Ingemar |
I'll see if I can get him to send them to me again so I can post them That would make you an international hero. I will personally see to it that a statue is erected in Amsterdam to honor your benevolent actions.  | ||
| Ronlv |
i just cut my v-stack off at the bottom(like they were talking about on the aussie site) it was supossed to make a tire spinning, wheelieing monster out of it but i didnt feel any diffrence when i rode it, except its louder so the changes in height on my setup didnt do anything that i could tell, seat of the pants without a dyno, good or bad i was running stock v-stack with heat barrier, k&n filter, complete upper airbox removed except for the top nipple piece which holds it all together my 2 cents, i wouldnt spend any money on diffrent v-stacks just open your airbox up for almost free now i have to go buy a new stock v-stack, o-well it was worth a try o yeh, with the before i cut the stack off mods, my dealer here test rode it after a oil change and said it was the best running buell he ever rode and wondered what i had done to it i told him no motor mods, just drummer and the airbox mods | ||
| Jerseyguy |
Drummer! | ||
| Kaese |
I have a Drummer, Race ECM and K&N, cut my velocity stack on my XB9 and seat of the pants dyno told me that the I had much more torque on the bottom end, from 3-5,000 RPM. You know kick ••• one that appears at 5K? It seems now I have it from 2500-5000. I tend to believe the Aussies. My 2 cents. | ||
| M1combat |
"It does not mean that a sharp angle of 7 degrees or less is as optimally efficient in ducted flow" Copy... Thanks . |
