[Spridgets] 1275 with headers exhaust?

[crusaderchuck55@aol.com]

    Considering I'm better known for racing my 1960 saab 93F , I'm very aware of decibels.   Kinda explains why I have my own meter?  LOL!We encountered ( a number of years ago) a huge amount of prejudice towards the saab and rotary powered RX7's with the Pennsylvania hillclimb association.  After a few events the individuals objecting to our alleged offensive noise .....backed off significantly!   Why you ask??   It was determined the MAC's, MGB's and spridgets were producing high enough levels that they should have been protested , not our saab nor the mazdas.  Rotarys & 2 strokes have piercing high pitches, but not near the SCCA maximum allowed Db limits.  And I'm aware of troubling road and lime rock with restrictions.    I did add a turn down to attempt to be kind to our starting line workers at hillclimbs but it had no bearing on our Db readings.  Chuck
Sent from my LG Mobile



------ Original message------From: Bob SpruckDate: Wed, Jun 27, 2018 9:21 PMTo: spridgets at autox.team.net;crusaderchuck55 at aol.com;Subject:Re: [Spridgets] 1275 with headers exhaust?
    FYI - One thing to consider is          noise limits at the tracks you plan to race at. I race at Road          Atlanta which has none but the limit at Roebling Road is 104          decibels for vintage cars. I am also a Tech Inspector for VDCA          and warn new drivers of the consequences of too loud exhaust.          They send you home! Most drivers have designed a swiveling,          down-turned tailpipe extension that can be pointed away from          the meter at the sound station. Some drivers have had to          install a muffler (what heresy!). A friend in a Turner had to          back off at a point about 1/3 down the front straight, where          the sound meter was. Really impacted his racing and happiness          (and safety). The neighborhood monitors impose LARGE fines to          the track for those over the limit.    Just sayin'.    Bob Spruck
        
    On 6/27/2018 6:00 PM, Rick Fisk via      Spridgets wrote:
                    This was on my car when I bought it a few months ago.  No        pipe at all under the car!      
            
        
        Sent from my keyboard      
        On Jun 27, 2018, at 4:10 PM, crusaderchuck55 at aol.com        via Spridgets <spridgets at autox.team.net> wrote:
        
                                          Here's a              question!   Ignore what size header collector..ok?  Ignore              the fact all available mufflers only come in a certain              size!            What              diameter pipe would you run from front to back and why.               I'm building an exhaust for Frank's race car project.               I'm making an oval pipe for front to rear ( or possibly a              side pipe! A custom made side exit header is coming my way              and might end up on the car!).   I've heard a lot of              1&3/4", 1&7/8" and 2" suggestions.   Ok what's              going to work for a tad of back pressure and outright              breathing if I create a chambered pipe ( like corvette              1960's had) .   I can fabricate any specific area in an              oval as far as the end area equaling a round pipe.            So, what              are the collective thoughts?            Share              away!            I'm not              putting a round pipe under this car!   Also I'm not going              through the tunnel.  Also for those of you who have had              dyno time,  the length is important to dial in max torque              at a specific RPM range.             So?  What              cha think?            Chuck            Flogging              away on Frank's race car!!            Sent from my LG              Mobile                                      ------------------------
          
          spridgets at autox.team.net
          
          Donate: http://www.team.net/donate.html
          Suggested annual donation: $12.75
          
          Archive: http://www.team.net/pipermail/spridgets
          
          Unsubscribe/Manage: http://autox.team.net/mailman/options/spridgets/refisk@chartermi.net
                    
            
      ------------------------spridgets at autox.team.netDonate: http://www.team.net/donate.htmlSuggested annual donation: $12.75Archive: http://www.team.net/pipermail/spridgetsUnsubscribe/Manage: http://autox.team.net/mailman/options/spridgets/raspruck@gmail.com        
  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/spridgets/attachments/20180628/c81a5619/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 1530151942066.png
Type: image/png
Size: 240630 bytes
Desc: 1530151942066.png
URL: <http://autox.team.net/pipermail/spridgets/attachments/20180628/c81a5619/attachment.png>