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Old 09-08-2009, 01:25 PM
jay sawdust's Avatar
jay sawdust jay sawdust is offline
Motorized Bicycle Senior Member
Join Date: Aug 2009
Location: kauai,hawaii
Posts: 55
Default Re: "TUNABLE EXHAUST"- A valid concept?

Well...your gonna get alot of feedback on this one....On a four stroke engine little or no backpresure is best for racing (although this is also "tuneable" by varying the length of the collector pipe).....A 2-stroke engine is a differant animal altogeather...A "tuned"exaust system for a 2-stroke utilizes an expantion chamber that both draws unburnt air/fuel mixture through the motor and by use of pressure waves "reinserts" said air/fuel mixture on the next stroke....essentialy superchargeing the motor....thats the basics....Ill let the more knolageable members elaborate....J
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