grumpyvette Posted May 17, 2005 Share Posted May 17, 2005 if I was doning it ID skip the areo mufflers and the cone alltogether header collectors to the (Y) and the spiro baffles in the comon rear larger pipe would be the total system Quote Link to comment Share on other sites More sharing options...
rudypoochris Posted May 18, 2005 Share Posted May 18, 2005 wow so no muffler at all? how loud will this be.... or does the spiral baffle really work that well? also pipe diameter 4 inch from the y back? or is that jsut over kill? what is the dimension of the exits from shorty 302 headers 2.5? 2? Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted May 18, 2005 Share Posted May 18, 2005 twin 2.5" feed exhaust pipes to the twin entrance pipes of the (Y) from the collectors to a 3" single exhaust with the spiral baffles installed should be easily large enought for a 331 displacement and yeah the baffles work like a muffler to some extent but it will be loud, if its too loud for your taste add one of those 3" mufflers. I don,t see why you want a single exhaust over a full length dual exhaust with an (X) installed close to the collectors http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=4550989354&category=34203 Quote Link to comment Share on other sites More sharing options...
rudypoochris Posted May 18, 2005 Share Posted May 18, 2005 im thinking twin 2.5 to a 3 inch (-2.75 sq in over dual 2.5") or 3.5 inch (-.2 in square in over dual 2.5) i thinkt he 3.5 in will be more close to a dual 2.5" size but is a 3 in more than enough? if so i will probably use the turck/suv aero turbine muffler... if i did that, would it be wise to still use the baffles? 2nd idea is a dual 2.5 to a 3.5" with a baffle and two cones, would this be about as loud as a muffler or do the baffles/cones only cut out noise to a certain extent? Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted May 18, 2005 Share Posted May 18, 2005 while your correct that twin 2.5" feeds have a greater cross section than a single 3" and a single 3.5" would be better matched a single 3" will be reasonably effective and not too restrictive simply because the exhaust voluum will cool/condense by the time it gets that far, yeah a 3.5" will be better but not mandatory and at some point compromises due to clearances/packaging room become critical the baffles don,t pose a huge restriction in a 3.5" single exhaust,and I doubt the muffler will be necessary, using the spiral baffles,in a 3" single your probably better off running the muffler without the baffles I don,t see why you want a single exhaust over a full length dual exhaust with an (X) installed close to the collectors, the dual exhaust has advantages in that you can use dual mufflers, lowering the total restriction in the system yeah it costs more but its low restriction and on a 331 displacement you could even get by with a full 2.5" system with the (X) splitting the flow and lowering the restriction. Quote Link to comment Share on other sites More sharing options...
y-not Posted May 25, 2005 Author Share Posted May 25, 2005 Thanks for all the input on the exhaust harmonics. We tried the bullet muffler in the 3" diameter pipe that 2126 suggested. It worked great and also quieted the overall noise fom the exhaust. Thanks, Bill Quote Link to comment Share on other sites More sharing options...
peej410 Posted July 5, 2005 Share Posted July 5, 2005 hey, i saw this topic and i was wondering where i can get a lined flex pipe for a fwd car, ive been looking online for about an hour but i havent found one, the unlined type buzzes, and i knwo because i have one on my car haha, you know of any grumpy? EDIT: nevermind i found/ordered two from http://www.epiflex.com Quote Link to comment Share on other sites More sharing options...
rudypoochris Posted May 10, 2007 Share Posted May 10, 2007 Sorry to kick up an old thread but: Wavelength = 1100 X 60 X 1/RPM X 1/4 X 1/2 or Wavelength = 8250 / RPM Wavelength = standing wavelength 1100 = speed of sound in air in feet per second 60 = convert RPM to Revs per second RPM = RPM 1/4 = four cylender firings per revolution (make this 1/2 for "true dual") 1/2 = standing wavelength is half the wavelength of a "normal" wave Is that in inches or feet? Also, how would one work out the math for a single as there would be two lengths before the pipes joined. How does resonance work with say a 4000rpm and 8000rpm mix. 4000rpm gives 2.0625 unit length and 1.0315 units for 8000 rpm. Does that mean every multiple of length 1.0315 will resonate at 8,000 rpm? Only half the time at 4,000? Thanks! Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted May 10, 2007 Share Posted May 10, 2007 http://victorylibrary.com/mopar/header-tech-c.htm read thru this again Quote Link to comment Share on other sites More sharing options...
rudypoochris Posted May 11, 2007 Share Posted May 11, 2007 I just did. That seems to only refer to exhaust headers. I am wondering about the length of the system on a single exhaust setup from from valve back. Trying to figure out how to keep resonance from happening at driving RPMs. Quote Link to comment Share on other sites More sharing options...
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