2023 Integra exhaust.
Tester
1 Like
I think someone is trying to knock down an exhaust drone with the loops…
1 Like
Sort of looks like the piping configuration of a sousaphone.
Acura probably suggests to not use those loops for tow hooks … lol .
OK, we have miles of this exhaust pipe, what to do? Maybe it is for increased back pressure? Not even symmetrical!
I’m guessing to tune the sound.
6 Likes
Pretzel option.
1 Like
A single muff system today with Rez is $500+.
A dual muff/single Rez is $750+
The days of $109 systems are long gone.
Maybe professor @Triedaq can explain the acoustic principles involved.
@bing I think the curves at the end of the exhaust piping is to lower the sound. On the French horn (and trumpets, tubas, etc) adds tubing to lower the pitch. The length of the tube determines the fundamental frequency. Then the first overtone of a fixed tube is an octave higher. The next overtone is an octave and a fifth higher, then an octave higher, then an octave and a third, etc.
The curves just add to the length. I have a garden hose I cut to the length of the tube in a French horn. I put my horn mouthpiece on one end and a funnel on the other end. When I am asked to demonstrate the horn to children’s music classes, I stretch out the hose and play a little tune. I then curl the hose up and play the same tune. The pitch doesn’t change, but I tell the students that it is more convenient to have the hose coiled up.
I then show them my horn without valves. I can play a scale by putting my hand in the bell to shorten the length of the tube, and raise the pitch, or extend my hand from the bell to lower the pitch. I then remove a slide and put in a longer slide and show that it lowers the pitch.
My guess is that the exhaust system in the picture has the curves added to change the exhaust note.
4 Likes
So much for second grade music class. Never learned that and never missed a day.
@bing Valves didn’t come along on the French horn until about 1900. After valves came along, the horns had three valves. One valve lowered the pitch by a whole step. The second valve lowered the pitch by a half step, while the third valve lowered the pitch by a step and a half. Using combinations of these valves allowed the player to play all the notes on the chromatic scale. A fourth valve was added to send the air through a different set of valve slides and made the high notes easier to play. These are called double horns and are the most common. Now there are triple horns with a 5th valve added. It’s analogous to adding more speeds to a transmission on a car.
If you don’t like a car with a transmission that shifts through multiple gears, you buy a car with a CVT. If you don’t want to press all the valves on the French horn, you play the CVT equivalent–the trombone.
3 Likes
Re: Music class
I’ve been watching DVD’s about recording methods and the music-theory the Beatles used to produce some of their albums. I’m not a musician but I enjoy to (try to) play the guitar imitating 60’s rock tunes, and the Beatle scale-choices and chord progressions are remarkably more complex than most music of that era. Back to the car exhaust configuration (sort of), the Beatles sometimes wanted to add a slightly delayed version of a sound to the original sound, and the way they did that – seems hard to believe in this high tech era – they had a big, enclosed, soundproof box with a speaker on one of the inner sides, and and a microphone on the other. The delay was just the time it took the sound to traverse the distance of the box.
1 Like
“I have a garden hose I cut to the length of the tube in a French horn. I put my horn mouthpiece on one end and a funnel on the other end.”
Shades of PDQ Bach!
I played the horn part on P.D.Q. Bach’s “Oedipus Tex”. The first part I played on a funnel. The second part I had to couple the third valve slide to the tuning slide and play on the overtones produced by these two slides coupled together. P.D.Q. Bach then specified that the next portion of the work was to be played on the whole horn on the 2nd valve with the valve slide removed. For the finale, the whole horn is used.
I went to Autozone to buy a piece of hose to couple the third valve slide and the tuning slide together. I put the horn mouthpiece in one end of these coupled slides and played. For an appropriate funnel, I went to Rural King. A sales associate showed me the array of funnels. When I told him I needed one that I could fit my mouthpiece into, the associate said, “You must be playing something by P.D.Q. Bach”.
Ya all made me listen to oedipus Tex.
In high school and college we mainly only did works by f. Melius Christiansen of st. Olaf and his brother Paul j at concordia. So a little light on the orchestra stuff. Just reminded me is all.
Triedaq – You are way beyond me, but I’ve know that since I started luring here 25 or so years ago.
@circuitsmith Thank you for the link to that P.D.Q. Bach band composition. Reminds me of the Checker cab vehicles with the Chevrolet engine the Ford front end, the Borg Warner transmissions etc
Speaking of Bach, he was my dog’s favorite composer! Minuet in G , his dog-favorite. Very big on Brandenburg Concertos too. He could take or leave the Beatles, Cat Stevens, Elton John, Rolling Stones. He didn’t like heavy metal, but strangely seemed to have an affinity for Led Zeppelin’s “Stairway to Heaven”, maybe there’s a music-theory relationship between it and Bach.