collapse

Author Topic: What's the REAL deal with direct mount filters?  (Read 429 times)

Offline MxM1980

  • Newbie
  • Posts: 9
What's the REAL deal with direct mount filters?
« on: April 16, 2017, 07:56:04 AM »
I know I'm probably becoming a P.I.T.A with all these question lol.... BUT, what is the real deal with running a direct mount filter?.... my snorkel is getting kinda janky, and I already have an Hsr45 on it anyway.... but I've heard you need to jet smaller?.... I always thought more air, more fuel...... can someone who knows fill me in on this please?

Offline Oldmanracing

  • LifeMember
  • Hero Member
  • *****
  • Posts: 329
Re: What's the REAL deal with direct mount filters?
« Reply #1 on: April 20, 2017, 11:07:27 AM »
Direct mount filters will give a gain on the bottom end.
Issues:
1. Because the air is entering from all directions the air enters the carb tumbling.  Tumbling air will become a restriction at higher rpm's.
2. The reason that you have to jet smaller is because the pressure in the carb sucks fuel harder and thus the air to fuel ratio needs to be adjusted.
3. The only carb that can run a direct mount filter is the Lectron. The fuel rises behind the needle and the taper in front of venture is more aggressive to maintain velocity through the carb.
4. If you are above 5000 feet elevation, open airbox or direct mount can work. Its all about pressure control.
We all tried to use the direct mount, but found what we gained at the bottom was lost at the top.

 

* Calendar

December 2017
Sun Mon Tue Wed Thu Fri Sat
1 2
3 4 5 6 7 8 9
10 11 12 13 14 [15] 16
17 18 19 20 21 22 23
24 25 26 27 28 29 30
31

No calendar events were found.

* Recent Posts

Front shock bushings by persom55
[December 14, 2017, 08:07:58 AM]


Howdy~ From the Paradise of the Pacific Huntington Beach California by bob
[December 13, 2017, 07:25:24 PM]


Range by bob
[December 12, 2017, 06:22:20 PM]


Better Exhaust System? by ERBE
[December 01, 2017, 11:59:59 AM]


High Velocity Porting by ERBE
[November 26, 2017, 08:48:53 PM]


Found something cool on eBay by hsr-tm45s
[November 23, 2017, 02:58:46 PM]


Ace Fabrication by MRDS650
[November 21, 2017, 10:47:05 AM]


jetting by BigFun421
[November 18, 2017, 05:19:41 PM]


Looney tuned...Sand pig to HogZilla. by BigFun421
[November 18, 2017, 12:59:44 PM]


Hello to all from,Yosemite California. by BigFun421
[November 17, 2017, 06:09:36 AM]


HELLO IS ANYONE STILL HERE?? by MRDS650
[November 15, 2017, 07:40:04 PM]


New from Northern CA w/ DS954 by BigFun421
[November 07, 2017, 09:05:00 PM]


Polyethelene high molecule shock bushings. For ds factory shocks by bob
[November 04, 2017, 06:29:41 PM]


water pump seal by persom55
[August 30, 2017, 02:20:17 PM]


charging system problems! by bob
[July 14, 2017, 05:56:28 PM]


Ds 1000 by romanrsx
[June 17, 2017, 06:17:58 AM]


what size shim do i need and where can i get them by BigRay800
[June 05, 2017, 10:14:46 PM]


Running Hot by Dirk1616
[June 05, 2017, 04:45:57 AM]


Brake hub removal by Dirk1616
[June 02, 2017, 03:51:50 AM]


Silver Lake Memorial Day Weekend 2017 by bob
[May 31, 2017, 05:47:20 PM]


dune trip in the planning by badge
[May 28, 2017, 03:11:42 PM]


Float settings by Oldmanracing
[May 24, 2017, 07:34:38 PM]


Forced Air Intake With A Fan by Dirk1616
[May 22, 2017, 08:42:24 AM]


Need help by kevinpd1987
[May 18, 2017, 01:13:58 AM]


Can anyone help me with a VIN? by kevinpd1987
[May 18, 2017, 12:52:21 AM]