It's official, two brothers exhuast are too loud. Tested 102dba

[chrise2469]

My city of Winnipeg is planing on instituting the SAE J2825 in the near future  which basically says:
>92 dBA at idle for all motorcycles
>96 dBA for motorcycles with fewer than three cylinders or more than four cylinders at 2000 rpm
(or 75 percent of maximum engine speed, whichever is less)
> 100 dBA for motorcycles with three or four cylinders at 5,000 rpm (or 75 percent of maximum
engine speed, whichever is less)
by holding a sound meter 20 inches behind the exhaust outlet, at the same height, and 45 degrees from the line of travel of the motorcycle.
The 6 into 6 two brothers came in at 90.5 at idle and 102db at 5000 rpm.  

I had too look the standard up as the police thought it was a 96db at 5000.  There was a bastardized version of this passed in Edmonton where the max limit is 96dba above idle.  

Time to start hunting down some stock pipes.  Might have to ping Adrian, he seems to find all the good parts in Canada

[Thunderbolt]

I took them off and sold them.  I bought some Cobra's and with the baffles in, it was tolerable.  If you take the baffles out, they are too loud too.  But lots of fun when you go to bike night. 

[Hoser]

This is the standard your valk should have been held to.  2000 rpm is a lot less than 5000 rpm. You got hosed   Hoser

>96 dBA for motorcycles with fewer than three cylinders or more than four cylinders at 2000 rpm
(or 75 percent of maximum engine speed, whichever is less)

Your valk does not need to pass this standard to be legal, it has 6 cylinders.

> 100 dBA for motorcycles with three or four cylinders at 5,000 rpm (or 75 percent of maximum
engine speed, whichever is less)

[Momz]

[Chiefy]

DB, and DBA (if I recall correctly from 30 years ago) are not the same thing.  DB is the measurement you want.  DBA I believe is RF (radio frequency) power.

I would google it and get it straight, then make sure you're measuring correctly.

[Chiefy]

DB, and DBA (if I recall correctly from 30 years ago) are not the same thing.  DB is the measurement you want.  DBA I believe is RF (radio frequency) power.

I would google it and get it straight, then make sure you're measuring correctly.

My mistake, I was thinking dbM  It was a long time ago...........

Here in the states, sometimes laws effect things only from the time they are enacted, the bikes with existing loud pipes might be excluded.  We call that "Grand-fathered in."  Something to check before you spend the money.........

[chrise2469]

This is the standard your valk should have been held to.  2000 rpm is a lot less than 5000 rpm. You got hosed  Hoser
>96 dBA for motorcycles with fewer than three cylinders or more than four cylinders at 2000 rpm
(or 75 percent of maximum engine speed, whichever is less)

It's a combination law your exhaust must meet all 3 conditions to pass.  It passes two of the three but that's not good enough.  Definitely getting hosed 

Here in the states, sometimes laws effect things only from the time they are enacted, the bikes with existing loud pipes might be excluded.  We call that "Grand-fathered in."  Something to check before you spend the money.........

No grandfathering here, it's meant to get rid of a lot of aftermarket exhaust.  It's not law yet so I can hunt for a while.

[Cliff]

DB, and DBA (if I recall correctly from 30 years ago) are not the same thing.  DB is the measurement you want.  DBA I believe is RF (radio frequency) power.

I would google it and get it straight, then make sure you're measuring correctly.

Not all sound pressures are equally loud. This is because the human ear does not respond equally to all frequencies: we are much more sensitive to sounds in the frequency range about 1 kHz to 4 kHz (1000 to 4000 vibrations per second) than to very low or high frequency sounds. For this reason, sound meters are usually fitted with a filter whose response to frequency is a bit like that of the human ear. (More about these filters below.) If the "A weighting filter" is used, the sound pressure level is given in units of dB(A) or dBA. Sound pressure level on the dBA scale is easy to measure and is therefore widely used. It is still different from loudness, however, because the filter does not respond in quite the same way as the ear. To determine the loudness of a sound, one needs to consult some curves representing the frequency response of the human ear, given below. (Alternatively, you can measure your own hearing response.)

[solo1]

When the AMA first published their suggested sound test, We tried it here at home using a Radio shack meter. Yeah,  I know, Radio Shack isn't the best.  Mark's (Mad6Gun)Valkyrie with Viking mufflers passed the test.

The Viking exhaust that Mark has sounds great, mellow and deep.  I won't comment on some exhausts that sound like rusted out stock mufflers..

[czuch]

Sounds like someones son bought an exaust plant.
OR they want to get a lot of bikes off the road.

[B]

you guys have me so confused I guess I'll just ride til they try to stop me.  . Glad I kept the stock pipes ... Just in case.

[Hoser]

That's not what it reads, I think some dumbass misunderstood what it he was reading when  when he tested your bike.  By the way, 75% of your redline is 4875 rpm, or did he miscalulate that also? I will contact the AMA and find out for sure. Hoser

[chrise2469]

That's not what it reads, I think some dumbass misunderstood what it he was reading when  when he tested your bike.  By the way, 75% of your redline is 4875 rpm, or did he miscalulate that also? I will contact the AMA and find out for sure. Hoser

Well, call me a  , you certainly appear to be right Hoser.  There is no bylaw in place as of yet so they are using the standard and certainly don't know it very well.  I was reading it as a "conditional and".  The  inductive tach they were using was unable to get an accurate on my bike so I just went off the tach.

The other problem is they are also quoting the messed up Edmonton bylaw in which they said any exhaust over 96db is illegal at any rpm.
http://www.edmontonpolice.ca/TrafficVehicles/TrafficNoise/COEBylaw.aspx
The original edmonton police proposal was the standard but it got messed up somehow in the second reading and passed.
http://fightyourtickets.ca/noise-by-law-motorcycles-edmonton/

[fudgie]

Guess someone should send a bunch of 'loud pipes save lives' patched to canada.