Bill,
I thought PIR was a 103dB max without special deviation permit that stopped
giving out.B That was one of the reasons ALMS quit going, they gave some
ridiculous deal at the last race like LMP900 had 118dB, LMP675 had 110, GT1
had 105 and GT2 had 103
There is also a law on the Oregon book that states any vehicle regardless of
on or off road use is required to have a spark arresting muffler on
it...learned that from hill climb days.
aaron
#87 HP Spitfire
----- Original Message -----
From: "Bill Babcock" <Billb@bnj.com>
To: "Tony Drews" <tony@tonydrews.com>
Cc: fot@autox.team.net
Sent: Friday, March 20, 2009 10:46:14 PM GMT -05:00 US/Canada Eastern
Subject: Re: [Fot] CRC and noise
As i said, I've run a straight pipe on Peyote and never had a problem. B
and we run Can Am cars at this event without problems. If you think B
your Triumph is louder than a Lola T70 or a Porsche 917 then you'd B
have something to worry about. In the very unlikely event you'd need B
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 B
straight-through muffler lets me meet that limit. Decibels are a B
logrithmic scale, so 3 db is roughly ten times louder. 13 decibels B
difference is more than ten thousand times louder. a train warning B
horn is 100db.
In other words, it's not a problem.
On Mar 20, 2009, at 4:19 PM, Tony Drews wrote:
> Hmm. B So the Columbia River Classic at PIR has a semi-restrictive B
> noise level? B I've never made provisions for that...
>
> Would suck to tow for 3 days and not be able to run because I'm too B
> 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 B
>> 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 B
>> 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@bnj.com
503.936.7660
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