Discussion
I've made up a pair of bolt on silencers for trakday use. They only reduce the noise by 3dB (103 to 100dB) I was hoping for more. The wadding I bought was to pack a volume of up to 2 litres, the volume of the silencers are 1.5l. is this over pack? Would it make a difference if I reduce the wadding. There is only a limited number of time that I'll be able to disassemble and reassemble them so I want to avoid trial and error.
Mark
>> Edited by tvrmark on Tuesday 1st June 23:15
Mark
>> Edited by tvrmark on Tuesday 1st June 23:15
2 sheds said:
Ideally you want about 4 1/2 to 5" O/D this is more important than length, ours reduce by 5-7 dba and they are only 8" long.
Tim
The plan is, these silencers fit inside the tail pipe (although they are a bit long at the moment) as first stage silencing. Then I can bolt on your type which will reduce it by another 5-7 dba.
Mark
Depending on your state of tune, silencers are more or less power drainers by either interfering with your flow or resonance.
By knocking the noise down too much, you will kill your power, if you are talking ultimate tune. A baffle silencer is needed to chop the LF components down a bit with any exhaust. Glasspack reduces the HF component. As packing density increaces, your HF volume will also as well as your HP by reduced absorbtion of the higher freq' components adding up to a steep pressure gradient on the reflection component of the exhaust. Baffle silencers are just a waste of power and glasspacks cannot be expected to do more than take the edge off the roar.
If you are after some track day silencing. Make an add on box which is big and has large baffles. Run your pipe into this. If your primary exhaust runs into this, you will have a tuned length for performance and a silencer which shuts it up. Quite a lot of hillclimb cars I see have brackets for these.
To be quite frank, packing density has a negligable effect as you are just looking at having the stuff there with a "flexible" density (fibres can waggle)crap will glue these up and they should be replaced from time to time. A off the shelf glasspack will come with an optimum amount of stuff in it, this will clag up and become less efficient. Hence failing to reduce HF components. Your silencer is merely reuseable.
Loud zorst designed properly=maximum welly, anyone who tells you otherwise is trying to sell you their "Silencer"
By knocking the noise down too much, you will kill your power, if you are talking ultimate tune. A baffle silencer is needed to chop the LF components down a bit with any exhaust. Glasspack reduces the HF component. As packing density increaces, your HF volume will also as well as your HP by reduced absorbtion of the higher freq' components adding up to a steep pressure gradient on the reflection component of the exhaust. Baffle silencers are just a waste of power and glasspacks cannot be expected to do more than take the edge off the roar.
If you are after some track day silencing. Make an add on box which is big and has large baffles. Run your pipe into this. If your primary exhaust runs into this, you will have a tuned length for performance and a silencer which shuts it up. Quite a lot of hillclimb cars I see have brackets for these.
To be quite frank, packing density has a negligable effect as you are just looking at having the stuff there with a "flexible" density (fibres can waggle)crap will glue these up and they should be replaced from time to time. A off the shelf glasspack will come with an optimum amount of stuff in it, this will clag up and become less efficient. Hence failing to reduce HF components. Your silencer is merely reuseable.
Loud zorst designed properly=maximum welly, anyone who tells you otherwise is trying to sell you their "Silencer"
Supertrapp sell a prime example of a "silencer" that dosent do what it says.
These are made by stacking plates of an increasing diameter, one on top of the other to create baffles.
All the claims ive seen regarding these things are spurious.
Tests done by a world respected tuner/modifier show that as soon as you put more plates in to silence it, you LOSE power. Take them out and you tune the NOISE back in........
Kind of pointless to sell it as a "performance" item when it'll lose power when silencing....
Steer clear of these.
These are made by stacking plates of an increasing diameter, one on top of the other to create baffles.
All the claims ive seen regarding these things are spurious.
Tests done by a world respected tuner/modifier show that as soon as you put more plates in to silence it, you LOSE power. Take them out and you tune the NOISE back in........
Kind of pointless to sell it as a "performance" item when it'll lose power when silencing....
Steer clear of these.
deltaf said:
Supertrapp sell a prime example of a "silencer" that dosent do what it says.
These are made by stacking plates of an increasing diameter, one on top of the other to create baffles.
All the claims ive seen regarding these things are spurious.
Tests done by a world respected tuner/modifier show that as soon as you put more plates in to silence it, you LOSE power. Take them out and you tune the NOISE back in........
Kind of pointless to sell it as a "performance" item when it'll lose power when silencing....
Steer clear of these.
Actually, the idea with Supertrapp is to increase flow (and thus noise) by adding plates. Each plate has a clearance between it and its neighbour(s) through which the gases pass. More plates = less restrction to flow = more noise. Not sure if your experience is in the car world but these systems have been around for a good few years in the bike arena and are pretty well respected, especially on singles and twins that are prone to knocking out fibre-wrapped baffles with their larger pulses.
pupp said:
Supertrapp sell a prime example of a "silencer" that dosent do what it says.
These are made by stacking plates of an increasing diameter, one on top of the other to create baffles.
All the claims ive seen regarding these things are spurious.
Tests done by a world respected tuner/modifier show that as soon as you put more plates in to silence it, you LOSE power. Take them out and you tune the NOISE back in........
Kind of pointless to sell it as a "performance" item when it'll lose power when silencing....
Steer clear of these.
Actually, the idea with Supertrapp is to increase flow (and thus noise) by adding plates. Each plate has a clearance between it and its neighbour(s) through which the gases pass. More plates = less restrction to flow = more noise. Not sure if your experience is in the car world but these systems have been around for a good few years in the bike arena and are pretty well respected, especially on singles and twins that are prone to knocking out fibre-wrapped baffles with their larger pulses.
Understand that, but dont understand how a "performance muffler" that dosent muffle when tuned to its loudest is any good as a ...er...muffler.
Also dont understand that when its tuned to be quiet that you lose power....not really a performance item....
Youd be just as well off having an open pipe and no restriction if it was of tuned length and noise didnt matter.
Just a thought....
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