Technical Tips > Engines - Carbies - Exhausts - Dissys
Hooker Side pipes. Any one had them decibel tested? (more pics added)
69 DIRTY RAT:
They are pretty much the standard versions.... the glasspack is basically what i said an exhaust shop would do and the other is quieter but is reverse flow, so your trying to push 4in through 2inch pipe that just folds back on itself, and sounds like you've captured Tweety in the pipe. Both are very restrictive and are touch and go with noise but they probably the best option for reducing noise. They would also end up being cheaper than getting them made locally? I've got the glasspak muffler homemade version and I reakon I'm losing at least 20-40hp
nifty:
i made a set for a mates 77.....made the way dirty rat said....internal baffle pipe with glass packing around the inside....gives a nice DEEP rumble,but is loud........
here they are on video.....
http://s68.photobucket.com/albums/i7/nifty_2006/?action=view¤t=021-1.flv
Thunder Kiss:
Just shove a few wads of steel wool up there the day you get it registered.;39
69 DIRTY RAT:
Shhhhhh! I know of that trick! but I blew a lot out. Just be aware that most Engineers and RTA know of this trick!
jdunne:
What is done on the bike pipes is the use of a small pack of washers with gradually decreasing center diameters...one well known brand was super trapp....the harleys straight pipes are known to use a similar restriction system(particularly about rego/roadworthy time!).....the other trick that does help is to turn down the outlet on the pipes towards the ground.....those that have heard my small block at full bore(6800 rpm) on the track will know how loud it is,but surprisingly it passes the noise tests at 2500 rpm with the same system....it is very very unrestrictive at higher rpm and surprisingly quiet at lower rpm...john;35;35
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