| Author | Message | ||
     Andros |
Hey guys. Some of you might be aware that i'm building a custom 1125 into a bobber. Its going well btw. If i were to create a different size tank shell then the standard airbox and filter would not fit any more. What filter solutions would be available and could work to supply the engine with enough air? The smaller the better and the more low profile the better. 2 tapered k&n filters on top of each intake? One big oval one like on a twin carb muscle car? Hope to get some cool inputs. anders =) | ||
| Jimustanguitar |
I don't have experience with this on FI bikes, but on the carbureted ones it's a tricky deal to get things just right without the factory airbox. A lot of guys put pods on their carbs and can never get them tuned in right again. Especially non CV carbs. On a fuel injected bike, I don't think you'd have the same trouble. Go for the largest surface area that you can and see what happens. I'm sure that somebody's done this and can give you better advice than that  | ||
| Figorvonbuellingham |
I think you should have two huge velocity stacks protruding out of it with like 100 Micron stainless screen on them. Kind of mold the cover around the stacks to follow the profile of them. (Message edited by figorvonbuellingham on October 09, 2013) | ||
| Sir_wadsalot |
It happens in streetfighter world pretty often....K&N makes different sized conical filters with rubber inlet necks to fit over throttle bodies. For the old Superduke there's a kit....a chrome plate that covers the TB's and the filters stand up off of it. Looks naked and sick, I was gonna adapt it to my SV1K if I ever rebuild it. There are ways... I'll have to dig for the narsty one I wanted, but Rottweiler Performance makes a more genteel one... I do like the idea of bigass velocity stacks, with some kind of cage to lay down on... (Message edited by sir_wadsalot on October 10, 2013) | ||
| Andros |
Thank you every one. What kind of specs apart from inlet diameter should i be looking for. Dont know much about flow and suction? Maximum surface area? | ||
| Figorvonbuellingham |
Here's a pic of an XB with velocity stacks ...looks nice. http://m.olx.com/item/show/4527291#&ui-state=dialo g | ||
| Andros |
Interesting. But isnt the velocity stack length very crucial to the performance of the machine? You cant just use any length because of the looks only I.e. tm's very accurately measured stacks? Wouldnt the perfect filter add as much suction as the bike needs without changing the length of the intakes? | ||
| Sir_wadsalot |
No, any filter will cut intake velocity a bit. The smaller the surface for the filter the more it will cut it. That's why it went from big round gilter with a narrow inlet all the way around, to a cone. The cone is smaller but there's more overall surface area. The big round ones have filter media in place of the lid now as well. The same with the big flat filters. More surface area. The length of the velocity stack dictates the flow speed going into the throttle boody. Long for top end power, short for low end torque. Or the opposite, I can't remember. Anyhoo, that's what the "variable intake height" systems on the yamahas are, a velocity stack slide that moves up and down. |
