D&M Spike air intake, replacement Filter ?
- Thread starter mittens
- Start date
Jwooky
Well-Known Member
@john sachs dyno’d those and found them to be very poor performers.
You will likely be suffocating your new performance upgrades with that air cleaner.
I’d recommend changing to a more free flowing design
You will likely be suffocating your new performance upgrades with that air cleaner.
I’d recommend changing to a more free flowing design
Jersey James
Jersey James
If money isn't a problem, the S&S dual runner is one of the better performing induction systems. For my tastes and $ I use the S&S "slasher" air cleaner. It's the traditional tear drop cover, with slotted openings around 3/4 of the circumference.
Stock S&S teardrop is better than the spike. I couldn’t wait to get that off my bike. I literally gave it away to another guy on this forum for free.
mleach72
Well-Known Member
Bigdogpartskingpin.com has a replacement filter for their spike. Not sure if it will fit your D&M. Check the specs against yours. If it doesn't fit, K&N makes a wide variety of conical filters.
BIG DOG MOTORCYCLES REPLACEMENT AIR FILTER FOR BIG DOG SPIKE AIR CLEAN
NEW REPLACEMENT OEM BIG DOG MOTORCYCLES SPIKE AIR FILTER ELEMENT. MEASURES 4" OD ON THE BIG END AND 2" AT THE SMALL END, 4 1/2" LONG. *** THESE ONLY FIT THE ORIGINAL STYLE BIG DOG ACCESSORY AIR CLEANERS WE SELL. SPIKE, CURVED, OR FLAT STYLE. WILL NOT WORK ON OTHER APPLICATIONS!! SEE PICTURE #7...
www.bigdogpartskingpin.com
Search By Dimension for Tapered Conical Air Filter
Factory direct K&N replacement air filters, air intakes, oil filters & cabin filters. KNFilters.com - the official site for performance filtration products.
www.knfilters.com
mittens
Well-Known Member
I have not found that K&N size/ part number for sale anywhere. will check out Partsking but from what I have seen these will not work. I did find a old school Velocity stack no filter, ha. Not to run it a lot but maybe to try between that and my spike and see if i can tell the difference...
mittens
Well-Known Member
This is the ONLY place I can find it show up and its back ordered....
American Made Motorcycle Parts. drag-specialties-design-air-cleaners-repl-air-filter-for-90-06-big-twin-and-88-06-xl-w-40mm-carb-01-13-big-twin-or-xl-w-delphi-efi-part-ac-7807-0018
American Made Motorcycle Parts. drag-specialties-design-air-cleaners-repl-air-filter-for-90-06-big-twin-and-88-06-xl-w-40mm-carb-01-13-big-twin-or-xl-w-delphi-efi-part-ac-7807-0018
mleach72
Well-Known Member
I would just try to clean the filter the best you can and upgrade the air cleaner whenever you can. It's true those spike ac's don't flow very well. If want to get the most out of your upgrades, you gotta let the engine breathe. The dual runner is great, but unfortunately they don't make them for the evos anymore. The teardrop is decent. You can boost the flow with the wide element kit. The forcewinder is pretty good too.
Olde Man
Active Member
This is the problem with spikes. When the air travels around the 90 deg fitting it tends to traver against the wall of the big radii and not follow short side or tight radii. This causes air to enter the carb very unevenly at higher velocities. There will be more posative airflow on one side and even a vacuum on the other. The jets and bleeds are in the center which is why mounting the spike vertically provides an equal but uneven air flow to each cylinder. They look great and perform badly.
Jwooky
Well-Known Member
Agreed, same with many of the styles that make a 90 turn. Be better off with stock.
Jwooky
Well-Known Member
Good lol