Building a performance muffler - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 06-20-2010, 09:54 AM
Blackdog's Avatar
Member
 
Last photo:
Join Date: Sep 2004
Location: Zillah Washington
Age: 65
Posts: 132
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Building a performance muffler

I posted this on several motorcycle web sites and no one can help so I'm turning to the experts here.

I have a new 2009 Buell XB12XT. I plan on installing the race ecm sometime soon. I'll install the race muffler also when it becomes available. In the mean time I bought a near new extra muffler to mod. My goal is to have a better sounding bike without excessive noise. This is what I started with.



I first cut it apart and remover the 3 pipes and bulkheads.



I'll leave the interactive valve in place to give the muffler a stock appearance. The valve it is fully open at idle and at high power. It's closed mid range to increase torque. When it's close it routs the exhaust trough the smaller pipe to increase back pressure. The valve will still be there but will not really do anything as the original guts are gone.



The problem is it's too quite, it sounds like a sewing machine. What I want is a good free flowing exhaust that's not too loud.



I'm installing 3 baffles, the 2" holes will be staggered. 2 will be welded at the jack points and one in the middle.

I have a lot of hot rod experience and I'm kind of copying a Flowmaster 3 chamber muffler, not too loud and not too quite. Before I weld everything up, I'd like to know if I'm on track. Any suggestions?

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 06-20-2010, 02:34 PM
airboat's Avatar
Registered User
 
Last photo:
Join Date: Mar 2006
Location: Canada
Posts: 286
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I think you are on the right track! I have built my own using design details from Fowmaster and other manufacturers. I used perforated steel and sheet metal for baffles, had one chamber pass through like Flowmaster. I think it worked great even if I don't know the CFM's or DB's. Sounds great IMO, a little louder than I expected but not as loud as many others. Sorry I didn't take any inside pics..
This one is for my 350 Porsche, 3" in and dual 2 1/4" out
Attached Thumbnails
Click image for larger version

Name:	P2270514.JPG
Views:	50
Size:	1.32 MB
ID:	46310  
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 06-20-2010, 03:27 PM
Blackdog's Avatar
Member
 
Last photo:
Join Date: Sep 2004
Location: Zillah Washington
Age: 65
Posts: 132
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Thanks airboat. How many chambers did yours have? Did you make your own perforated sheet metal?

The inlet is 2" dia so I'm using one 2" hole in each baffle. I'll have 3 (holes staggered) baffles so I guess you could call it a 4 chamber.

I need to study a few cut-away views if I can find some.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 06-20-2010, 04:49 PM
airboat's Avatar
Registered User
 
Last photo:
Join Date: Mar 2006
Location: Canada
Posts: 286
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I built an inlet chamber, a chamber that's ported to the inlet with 2, 2 1/2" pipes passing through and then the last chamber. I have angled and V shaped baffles here and there made out of the sheet metal and perforated steel.

I purchased my sheet metal and perforated steel from " Metal Supermarkets" locally www.metalsupermarkets.com for about $1.50/ Lb and they have many choices for size of hole and gauge.

I just looked around at performance muffler company's websites for ideas.
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Building a performance muffler Blackdog Engine 4 06-22-2010 08:22 PM
Performance Muffler Choices? A-BodyFan Engine 8 06-26-2006 07:58 AM
Building a muffler TurboS10 Hotrodders' Lounge 15 03-24-2004 04:09 PM
exhaust system length affect performance? smlblcks10 Engine 10 02-19-2004 04:40 PM
Auto Performance Business Venture Plan Opinions(long read) TurboS10 Hotrodders' Lounge 17 12-01-2003 09:33 PM


All times are GMT -6. The time now is 04:55 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.