Cutting a muffler down to size?



CRGuy

Posts Too Much
Member
Nov 14, 2000
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On a 2 stroke the shorter the silencer the louder the bike and more bottom. On a Thumper the same would apply. Why would you cut the exuast anyway?
 

Rich Rohrich

Moderator / BioHazard
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Jul 27, 1999
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Originally posted by CRGuy
On a 2 stroke the shorter the silencer the louder the bike and more bottom. On a Thumper the same would apply.


The interactions between the silencer and the pipe tuning are vastly different between a two-stoke and a four-stroke. The influence of the silencer on wave tuning is far greater on a two-stroke, but it isn't accurate to say that a shorter silencer ALWAYS produces more bottom end on a two-stroke, and the specific length of the silencer on a four-stroke has little or no bearing on power or sound output.

Generically speaking, four-stroke silencers with GREATER volume will TEND to have a lower DB rating, but that ignores a whole host of other factors, so even that statement is fairly stupid to make.

You can count on that fact that a HUGE amount of engineering dollars went into the design of the silencer on the CR450, and random attempts to "improve" at home are only likely to increase the noise and decrease the horsepower. I realize that won't stop people from trying though.
 

BoneBuster

Member
Apr 22, 2001
49
0
Originally posted by DPW
Here's another good picture of the shorter silencer

Look wise, it looks the same as the stocker, just shorter. Wonder if there is any trade secret difference in the guts.
 


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