[Spridgets] 1275 with headers exhaust?

[Bob Spruck]

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!
>
> image1.JPG
>
> Sent from my keyboard
>
> On Jun 27, 2018, at 4:10 PM, crusaderchuck55 at aol.com 
> <mailto:crusaderchuck55 at aol.com> via Spridgets 
> <spridgets at autox.team.net <mailto: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
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