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Re: [Fot] CRC and noise

To: Tony Drews <>
Subject: Re: [Fot] CRC and noise
From: Bill Babcock <>
Date: Fri, 20 Mar 2009 16:46:14 -1000
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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