new exhust design
Thread Starter
Team Owner
Joined: Nov 2004
Posts: 20,715
Likes: 25
From: Sorrento Italy
new exhust design
hi, i'm building a new exhaust for my '77 and i have drawn a new exhaust design (pls do NOT laugh about my scarce design capabilities
), it all starts with a new jet coated hooker super comp 1 3/4'' headers, then goes into a 2 3/4 '' int diameter tubing, going streight through the crossmember holes, into an X pipe and from there with a tubing up to near the front of the rear wheel, then has a bend and goes out from the side. a silencing module of abt 10/12'' long and int diam of 2'' will be added as close as posible to the exit...i guess also the X pipe will help reducing pulses fm engine and the sound will be much diff then the side mounts i have now, mellower.
i think this sistem will flow better then my side pipes with open mufflers, there is only smooth bends in it, it has a good average diam (not 2'' nor 2 1/2'' nor the too big 3'') for a 570hp engine and the X pipe in this application i think will be a key factor for flow and sound too...
will have it finished by mid next week, when ready will post pics, my driving comments and sound files.
comments?
sorry for the thread title wrong spelling...
), it all starts with a new jet coated hooker super comp 1 3/4'' headers, then goes into a 2 3/4 '' int diameter tubing, going streight through the crossmember holes, into an X pipe and from there with a tubing up to near the front of the rear wheel, then has a bend and goes out from the side. a silencing module of abt 10/12'' long and int diam of 2'' will be added as close as posible to the exit...i guess also the X pipe will help reducing pulses fm engine and the sound will be much diff then the side mounts i have now, mellower.i think this sistem will flow better then my side pipes with open mufflers, there is only smooth bends in it, it has a good average diam (not 2'' nor 2 1/2'' nor the too big 3'') for a 570hp engine and the X pipe in this application i think will be a key factor for flow and sound too...
will have it finished by mid next week, when ready will post pics, my driving comments and sound files.
comments?
sorry for the thread title wrong spelling...
Last edited by panic; Sep 15, 2006 at 06:31 AM.
Instructor
Joined: Nov 2003
Posts: 154
Likes: 0
From: NJ
I like your design. I've designed a similar system using 2 1/2 inch tubing with 30 inch chambered mufflers without a crossover. The car is a 79 with a modded 350, steet driven. I should have the exhaust finished soon and will post more on the subject.
Race Director
Joined: Nov 2000
Posts: 11,872
Likes: 12
From: Waterloo ontario Canada
You might find that by the time you finish the X that you have gone almost all the way past the wheels and then need a 90 degree bend to get out infront of the wheels. This leaves almost no room for a muffler.
Been their done that and found ground clearance also an issue.
If you run sidepipes you already no that the noise dumped right beside your ear becomes annoying and damaging after a long run on the expressways.
If you value your hearing don't dump that exhaust right beside your ear.
Been their done that and found ground clearance also an issue.
If you run sidepipes you already no that the noise dumped right beside your ear becomes annoying and damaging after a long run on the expressways.
If you value your hearing don't dump that exhaust right beside your ear.
Thread Starter
Team Owner
Joined: Nov 2004
Posts: 20,715
Likes: 25
From: Sorrento Italy
Originally Posted by norvalwilhelm
You might find that by the time you finish the X that you have gone almost all the way past the wheels and then need a 90 degree bend to get out infront of the wheels. This leaves almost no room for a muffler.
Been their done that and found ground clearance also an issue.
If you run sidepipes you already no that the noise dumped right beside your ear becomes annoying and damaging after a long run on the expressways.
If you value your hearing don't dump that exhaust right beside your ear.
Been their done that and found ground clearance also an issue.
If you run sidepipes you already no that the noise dumped right beside your ear becomes annoying and damaging after a long run on the expressways.
If you value your hearing don't dump that exhaust right beside your ear.
i've got short open mufflers on my side hookers that are right at my ear level at the moment (and i'm loosing earing capacity for this very reason)...this new one would go out well more back, closer to the real wheel, right where long tube standard side mounts have the exit.
clearance could be an iussue yes, i'll deal with it when under the car.
i'll avoid 90 grade bends or forget about, anyway the tube after the X can go in and out, this will leave freedom of positioning the last piece of tube in the best way with a wide bend just near where i'd wish to be...i can't explain but i've just tried it this morning, it works.
muffler, i will insert the silencing unit into the 2 3/4 tube itself, similar a glasspack into a 4'' side tube of a sidepipe, i've got a guy here who has done for me another of these for my tvr, it works great.
Race Director
Joined: Nov 2000
Posts: 11,872
Likes: 12
From: Waterloo ontario Canada
I did a crossover for a friend this summer and it was no fun. We tried to keep it as tight to the floor as possible and as close as possible to the crossmember and again it was not perfect.
The "H" pipe crossover is alot simpler, can be kept really close to the crossmember, summit sells them and it make it alot easier although it is not as affective.
Watch the hearing. I had trouble for days talking on the phone after running similiar pipes with quiet mufflers.
Also dragged a big turtle to death after getting stuck under the exhaust. That is the final straw and I replace it with out the back 3 inch. With 3 inch you have a free flowing exhaust and you outrun the noise. alot quieter and more ground clearance
The "H" pipe crossover is alot simpler, can be kept really close to the crossmember, summit sells them and it make it alot easier although it is not as affective.
Watch the hearing. I had trouble for days talking on the phone after running similiar pipes with quiet mufflers.
Also dragged a big turtle to death after getting stuck under the exhaust. That is the final straw and I replace it with out the back 3 inch. With 3 inch you have a free flowing exhaust and you outrun the noise. alot quieter and more ground clearance
Thread Starter
Team Owner
Joined: Nov 2004
Posts: 20,715
Likes: 25
From: Sorrento Italy
i'll try to keep the X as close to the crossmember as posible, anyway the more the X gets further back far from the crosssmember, the more the bend to go side will be sharp, even if it could still be smooth.
i'm very excited abt this project and i'm looking forward next week to start it...i've been trying many solutions to make a proper side mount flow like i need but nothing works over 4.000rpm without sacrifying at least 50 (costly) ponies or leave an open (short) muffler...it's the only one that allows the engine breath properly over 5.000rpm. My opinion is that on side mounts the sharp bend fm header/collector going sideway is prejudging performance on over 400 hp engines, and at over 4.000/4.500 rpms.
3'' tubing would be too big, my engine builder claims it would kill torque under 3.000 rpms, 2.00'' and 2 1/2 ''i believe are too small that's why i'm using 2 3/4 aluminized tubing.
i could also go further back and build a custom rear exhaust, for this purpose i have 2 brand new delta force 40 mufflers, but i want to try something more innovative, if it works all of you could maybe take advantage as well (i won't charge you anything
).
more ideas/comments?
Giuseppe
i'm very excited abt this project and i'm looking forward next week to start it...i've been trying many solutions to make a proper side mount flow like i need but nothing works over 4.000rpm without sacrifying at least 50 (costly) ponies or leave an open (short) muffler...it's the only one that allows the engine breath properly over 5.000rpm. My opinion is that on side mounts the sharp bend fm header/collector going sideway is prejudging performance on over 400 hp engines, and at over 4.000/4.500 rpms.
3'' tubing would be too big, my engine builder claims it would kill torque under 3.000 rpms, 2.00'' and 2 1/2 ''i believe are too small that's why i'm using 2 3/4 aluminized tubing.
i could also go further back and build a custom rear exhaust, for this purpose i have 2 brand new delta force 40 mufflers, but i want to try something more innovative, if it works all of you could maybe take advantage as well (i won't charge you anything
).more ideas/comments?
Giuseppe
Last edited by panic; Sep 15, 2006 at 02:25 PM.
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Le Mans Master
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From: Orlando Florida
St. Jude Donor '05
Originally Posted by norvalwilhelm
Also dragged a big turtle to death after getting stuck under the exhaust. That is the final straw and I replace it with out the back 3 inch.
Panic,
watch these turtles ......
Team Owner
Joined: Apr 1999
Posts: 21,953
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From: Reno Nevada
2024 C3 of the Year Finalist- Modified
It's best to redesign the crossmember and not use the pass through holes. It brings your exhaust to close to the transmission and unnessesary pipe bending.
The straight shot back out from the headers is best
The straight shot back out from the headers is best
Thread Starter
Team Owner
Joined: Nov 2004
Posts: 20,715
Likes: 25
From: Sorrento Italy
Originally Posted by gkull
It's best to redesign the crossmember and not use the pass through holes. It brings your exhaust to close to the transmission and unnessesary pipe bending.
The straight shot back out from the headers is best
The straight shot back out from the headers is best
Last edited by panic; Sep 15, 2006 at 05:28 PM.
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
X pipes and H pipes don't really lower the decible level of a motor. They actually double the frequency of the exhaust note. Instead on two individual 4 cylinder pipes with a deep low fequency pitch you now have all 8 and double it and it appears to be quieter.
To make the interior quiet you want the exhaust out the back. It also helps increase the top speed. The exhaust not only pushes you, but it also help fill in the low pressure
To make the interior quiet you want the exhaust out the back. It also helps increase the top speed. The exhaust not only pushes you, but it also help fill in the low pressure