www.CVOHARLEY.com

Please login or register.

Login with username, password and session length
Advanced search  

Author Topic: 2.25" FullSacs . Want to add Back Pressure?  (Read 1564 times)

0 Members and 1 Guest are viewing this topic.

HDDOCFL

  • 1K CVO Member
  • *
  • Offline Offline
  • Posts: 1032
  • Never Say Never
2.25" FullSacs . Want to add Back Pressure?
« on: November 08, 2009, 08:36:02 AM »
OK I have the 2.25" Full Sac baffles catless stock 09 headers and I feel I have lost low end tq. In an effort to get some tq. back I am about to add two 1/4" bolts in a cross patten to the baffle ends to gain some back pressure. Which should reduce the exhaust flow 1/2"  and give me some more low end tq. in my thinking. Have done this with straight pipes years ago and it worked. Anyone care to comment, before I give it a try. Also I like the sound of the 2.25" baffles and this mod should not change the note to much.? What you all think. I know I could change baffles easyer but want to try this fisrt.   Thanks Doc
Logged

HDDOCFL

  • 1K CVO Member
  • *
  • Offline Offline
  • Posts: 1032
  • Never Say Never
Re: 2.25" FullSacs . Want to add Back Pressure?
« Reply #1 on: November 08, 2009, 08:37:44 AM »
I should also state that I know about useing lolipops, which is another option.  Doc
Logged

LarryB

  • Tennessee Squire
  • 2.5K CVO Member
  • **
  • Offline Offline
  • Posts: 3656

    • CVO1: 09 FLTRSE3 The Grey Ghost
Re: 2.25" FullSacs . Want to add Back Pressure?
« Reply #2 on: November 08, 2009, 08:55:24 AM »
Doc, by wanting to add backpressure you really are creating turbulance. For this to be effective it needs to be created on the inboard end of the baffles. You can accomplish this on both baffles by installing the bolt setup at the end of the head pipe.
Logged
Take it Easy Greasy Cuz it's a long walk home.

Did I shave my head for this?

Ed Ramberger - One_Screamin_Eagle

  • Senior CVO Member
  • ****
  • Offline Offline
  • Posts: 306

    • CVO1: 2000 FLTRSEI
Re: 2.25" FullSacs . Want to add Back Pressure?
« Reply #3 on: November 08, 2009, 02:33:53 PM »
The concept of adding a bolt through the end of the pipe is simply that it breaks the pulse wave and prevents reversion.  The concept of using a washer welded to a bolt and rotating it in the pipe and watching torque increase until hp decreases uses the same concept plus restriction. 

Logged
FLTRSEI -Delphi Conversion, 103", 251 cams, Heavy Breather & a couple other little tweaks

HDDOCFL

  • 1K CVO Member
  • *
  • Offline Offline
  • Posts: 1032
  • Never Say Never
Re: 2.25" FullSacs . Want to add Back Pressure?
« Reply #4 on: November 09, 2009, 07:50:10 AM »
Lilipops it is then.  Doc
Logged

HDDOCFL

  • 1K CVO Member
  • *
  • Offline Offline
  • Posts: 1032
  • Never Say Never
Re: 2.25" FullSacs . Want to add Back Pressure?
« Reply #5 on: November 12, 2009, 07:21:45 AM »
Just another thought before I do anything. I wonder what gains would be made by blocking off the cross over and making the stock header a 2 into 1 and still useing the Full Sac 2.25" baffles. Any ideas on this?   Doc
Logged

LarryB

  • Tennessee Squire
  • 2.5K CVO Member
  • **
  • Offline Offline
  • Posts: 3656

    • CVO1: 09 FLTRSE3 The Grey Ghost
Re: 2.25" FullSacs . Want to add Back Pressure?
« Reply #6 on: November 12, 2009, 07:31:55 AM »
im with ya on the thought, but I don't think so. maybe with a different muffler. at that point, just get some D&D's
Logged
Take it Easy Greasy Cuz it's a long walk home.

Did I shave my head for this?

HDDOCFL

  • 1K CVO Member
  • *
  • Offline Offline
  • Posts: 1032
  • Never Say Never
Re: 2.25" FullSacs . Want to add Back Pressure?
« Reply #7 on: November 12, 2009, 07:48:11 AM »
Larry trying to do this on the cheap!   Doc
Logged

LC110

  • Elite CVO Member
  • *****
  • Offline Offline
  • Posts: 667
    • WI


    • CVO1: 2009 FLTRSE3 Stardust Silver / Titanium Dust 1of 1344
Re: 2.25" FullSacs . Want to add Back Pressure?
« Reply #8 on: November 12, 2009, 07:52:58 AM »
(Thought) Maybe place a lollipop at the crossover also.
Logged
Spending time learning the science of the mechanisms of friction, lubrication, and wear of interacting surfaces that are in relative motion
Razorback Performance Built & Tuned 113@ 122.59 HP/139.30 TQ

HDDOCFL

  • 1K CVO Member
  • *
  • Offline Offline
  • Posts: 1032
  • Never Say Never
Re: 2.25" FullSacs . Want to add Back Pressure?
« Reply #9 on: November 12, 2009, 02:52:21 PM »
I think I will start with a lollipop on the right side and see what happens.   Doc
Logged

Wheelsnkeels

  • Freedom isnt free Thank a Vet!
  • 1K CVO Member
  • *
  • Offline Offline
  • Posts: 1300
  • Indiana Patriot Guard Riders

    • CVO1: 2010 SESG Tequila Sunrise
    • CVO2: 2007 Heritage Custom (not CVO) too much chrome
    • CVO3: 2006 Heritage Classic (overinvested in mods ?)
Re: 2.25" FullSacs . Want to add Back Pressure?
« Reply #10 on: November 16, 2009, 06:49:06 PM »
How about a set of Torque cones they arent that pricey?
Logged
RC Components Savage  200/55/17 Rear 140/70/21 front
Corbin Dual Tour (Heated)
Street Magic LED's
TTS Mastertune
Fueling 574 Cams & Lifters
SE Adjustable pushrods
Progressive Mono Tubes
Hog Tunes Hog Pods
J&M 7.25 Speakers w/250W Amp
Kuryakyn 9182 License plate frame
Vance & Hines Power Dual's
BUB Boom Cans slip on Exhaust 
Detach Tequila King Tour Pak
Rumble passenger Floorboards
Freedom Shield 7"
Riders Claw Iphone

HDDOCFL

  • 1K CVO Member
  • *
  • Offline Offline
  • Posts: 1032
  • Never Say Never
Re: 2.25" FullSacs . Want to add Back Pressure?
« Reply #11 on: November 17, 2009, 07:33:00 AM »
Quote from: Wheelsnkeels on November 16, 2009, 06:49:06 PM
How about a set of Torque cones they arent that pricey?




I have tried them in the past and really had no luck with them, I have a set of them here that I tried before on another bike.   Thanks Doc
Logged
 

Page created in 0.22 seconds with 20 queries.