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Relentless Innovation in Exhaust Technology
Burns Stainless LLC Newsletter
Merge Collectors and More... March 2009
In This Issue
Repacking Mufflers
Burns Stainless Ultra-Light Motorsports Mufflers
Elston Exhaust
Muffler Packing Materials
Repacking Mufflers - It's Not Just For Noise
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One of the most important features of the Burns Ultra-Light Motorsports Mufflers is the ability to easily repack the muffler.  Depending upon the use of the muffler and the type of packing material used, mufflers may need to be repacked after every race, or may last for a season or more of racing.  In general, the closer the muffler is to the exhaust header, the faster the muffler packing will degrade.  When muffler packing degrades, not only does the sound of the exhaust become louder; surprisingly, engine performance can also suffer. 

Contrary to popular belief, a loud muffler indicates "wasted horsepower."  A well packed muffler not only absorbs sound waves, it also flows much like a straight pipe.  Whereas airflow in an unpacked muffler is disrupted as gases flow through the perforated core of the muffler contributing to turbulence and back-pressure.  Also, an empty muffler may act like an expansion chamber, altering the tune of the exhaust pipe.  Some race teams have been known to actually weigh mufflers after a race, and if the weight loss of the muffler exceeds a predetermined amount, the muffler is replaced with a freshly packed muffler.
 
The key lesson is that muffler packing is a consumable item.  Mufflers that have been in service without inspection are likely giving away horsepower.  Please contact Burns Stainless to purchase repack kits that will return your muffler to its original performance.

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Dear Vincent, 
Greetings from Burns Stainless LLC!  This is the second edition of our Burns Stainless Newsletter intended to keep you informed on exhaust technical subjects, Burns products, special pricing as well as news and happenings.  With the ever-growing need for exhaust mufflers in all venues of racing, this issue is intended to provide additional information on  Burns Ultra-Light Motorsports Mufflers. Please feel free to forward this information on to your colleagues and friends.
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Special! 
Special Price on Muffler Repack Kits!  Special price on muffler repack kits.  10% discount on Glasmat and Scrubble repack kits for Newsletter subscribers.  Stop wasting Horsepower, repack your mufflers!   CODE - MARSPEC
Offer Expires: April 16, 2009
Burns Ultra-Light Muffler - New Design for 2009!
Burns Stainless Ultra-light Motorsports Mufflers are proving very popular in all areas of motorsports including road racing, autocross, drag racing, boat racing and even some hot-street applications.  These mufflers have been redesigned and Burns Muffler on Superflowupdated for 2009.  New design features include a "floating" replaceable core minimizing internal stress and allowing for faster and easier rebuilds; new fastener design providing for easier removal of bolts during repacking; and a new outlet design allowing for the muffler to be used with turndowns or installed within an existing undercar exhaust system.  The mufflers are still constructed from TIG-welded 304SS providing a durable and lightweight package. The standard single-stage mufflers are available in tube sizes ranging from 2" ID to 5" ID.  Lengths from 6" to 17" are generally available from stock (see list of stock sizes).  Custom lengths are available by special order.

Collector-mufflers combinations are also available.  Utilizing our proprietary X-Design program to specify the proper merge collector and muffler size, performance can actually be improved!
 
Also new for 2009 are two-stage mufflers incorporating a second "baffle"-stage.  The baffle stage is comprised of an expansion, two V-angle baffles and a section of woven metal cloth.  Combined with the first-stage absorption section, these mufflers are 3-5 dB quieter than a similar sized single stage muffler.  The best news is that track testing on a sprint car showed no loss in power.  These mufflers are in stock in 2-1/2" ID to 4" ID and 17" length.  Custom sizes are also available.

Elston Exhaust - Leading Edge Exhaust Headers
 After spending over 17 years focusing on NASCAR CUP and pioneering several advancements in exhaust technology in that field, Elston Exhaust has inevitably been drawn into almost every area of motorsports by customers seeking the most powerful exhaust systems available. Elston Exhaust's Right-click here to download pictures. To help protect your privacy, Outlook prevented automatic download of this picture from the Internet. Comp Eliminator 3-2 Headergoal is to help engine builders and racers around the world realize how much they have been missing in their exhaust systems and driving innovation in the custom header market as a whole. 

From the first day of building headers Elston has used Burns Stainless products, and over the years they have proven to be of the highest quality and achieved the highest performance, period.

Muffler Packing Materials
 
Selection of muffler packing material is important for getting the best performance possible out of the muffler.  Burns Stainless offers 4 different muffler packings glasmat, stainless steel scrubble, glasmat/scrubble hybrid and stainless mesh. Right-click here to download pictures. To help protect your privacy, Outlook prevented automatic download of this picture from the Internet. Burns 2-Stage Muffler Glasmat is a high temperature fiberglass material.  It is an excellent choice for muffler packing as it is lightweight and inexpensive.  The drawback to glasmat is that it has an upper temperature limit of around 1000F.  Also, high intensity acoustic pressure waves can break-up the fibers causing the glasmat to essentially disintegrate.
 
Stainless steel scrubble is essentially coarse stainless steel wool having the appearance of milling machine shavings.  This material performs very well as a packing material but is heavier than glasmat and more expensive.  We have not found any substantive difference in muffling performance of the scrubble as compared with glasmat with well-packed mufflers. 
 
Glasmat/scrubble hybrid packing was developed for use in larger diameter muffler cases in order to improve the performance of the packing yet reduce the cost and weight penalties of scrubble.  These large diameter mufflers were initially developed for endurance racing, so muffler packing life was critical.  The hybrid solution performs well in these applications.
 
Most recently, for some of the most extreme applications, such as 24 hour endurance racing, stainless steel mesh has been developed as a packing material.  Stainless mesh, is extremely durable material but heavier and more costly still. 
 
Most Burns mufflers are packed standard with glasmat.  As mentioned above, the 6.25" OD mufflers are packed with glasmat/scrubble hybrid material.  The SM-250-350-17 is packed standard with scrubble.  Any muffler can be ordered with scrubble or stainless mesh packing, or can be added to the muffler on a special order basis.  We normally recommend that customers initially use glasmat packing and evaluate the life span of the packing in their application.  If the life of the packing is too short, then upgrading to scrubble packing is warranted.
Burns Stainless wishes to thank you for your business and we look forward to serving you in the future.  Please do not hesitate to give us a call if you need any assistance with a project..

 

Sincerely,

 


Vincent Roman
Burns Stainless LLC
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