[Fot] CRC and noise

[Bill Babcock]

My straight pipe does the same thing--dumps at the ground with an  
angle under the car. Some people say that can make the noise bounce  
around, but I find it to be pretty quiet and I've never had a problem.  
Most times i run a muffler though because i really don't need any more  
hearing loss, and i don't want excessively loud noise around the  
grandkids. I keep muffs on them, but still...

On Mar 24, 2009, at 3:05 PM, quicktr4 wrote:

> I Run almost strait pipes dumping out under the right door and have  
> never even been talked to at portland. If you think it might be an  
> issue bring some sort of diverter to dump it to the right. sound  
> trap is on the left down the back strait.
> ----- Original Message ----- From: "Bill Babcock" <Billb at bnj.com>
> To: "Tony Drews" <tony at tonydrews.com>
> Cc: <fot at autox.team.net>
> Sent: Friday, March 20, 2009 7:46 PM
> Subject: Re: [Fot] CRC and noise
>
>
>> As i said, I've run a straight pipe on Peyote and never had a  
>> problem.
>> and we run Can Am cars at this event without problems. If you think
>> your Triumph is louder than a Lola T70 or a Porsche 917 then you'd
>> have something to worry about. In the very unlikely event you'd need
>> more muffling we can always wire on something that will work.
>>
>> 105 db is pretty loud, Laguna Seca has a 92 db limit--my little
>> straight-through muffler lets me meet that limit. Decibels are a
>> logrithmic scale, so 3 db is roughly ten times louder. 13 decibels
>> difference is more than ten thousand times louder. a train warning
>> horn is 100db.
>>
>> In other words, it's not a problem.
>>
>> On Mar 20, 2009, at 4:19 PM, Tony Drews wrote:
>>
>>> Hmm.  So the Columbia River Classic at PIR has a semi-restrictive
>>> noise level?  I've never made provisions for that...
>>>
>>> Would suck to tow for 3 days and not be able to run because I'm too
>>> loud!
>>>
>>> - Tony Drews
>>>
>>> At 09:08 PM 3/20/2009, Bill Babcock wrote:
>>>> I assume you are talking about the Portland Historic Races and the
>>>> Pacific Northwest Historics which are July 3-5 and July 11-12, not
>>>> the
>>>> Columbia River Classic which is Sept 5-7 since there is no race at
>>>> Pacific Raceway the week before the CRC.
>>>>
>>>> The Portland Historic races are an HMSA event, I don't know what
>>>> noise
>>>> control level they'll be working with. You have to get a special
>>>> variance to exceed 105 db. A supertrapp is generally plenty. I've  
>>>> run
>>>> Peyote with an open exhaust at PIR and not exceeded the limit,  
>>>> but I
>>>> was just trying that out to see what worse case was. I run a light
>>>> muffler and never have a problem--nothing as restrictive as a
>>>> supertrapp.
>>>>
>>>> I don't know what the limit at Pacifc Raceways is, but it's  
>>>> generally
>>>> less restrictive than PIR. great track.
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>>
>> Bill Babcock
>> Babcock & Jenkins
>> Billb at bnj.com
>> 503.936.7660
>> www.bnj.com
>>
>> Editor
>> Ke Nalu e-Magazine
>> Paddlesurfing's Web Journal
>>
>> Bill at kenalu.com
>> www.kenalu.com
>> blog: www.ponohouse.com/ponoblog
>> _______________________________________________
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Bill Babcock
Babcock & Jenkins
Billb at bnj.com
503.936.7660
www.bnj.com

Editor
Ke Nalu e-Magazine
Paddlesurfing's Web Journal

Bill at kenalu.com
www.kenalu.com
blog: www.ponohouse.com/ponoblog