Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

2 Pages V  1 2 >  
 Reply to this topicStart new topic
> V6 & V8 teeners - above/below the axles?, Let's see your exahust!
3d914
post Feb 13 2012, 09:52 PM
Post #1


Senior Member
***

Group: Members
Posts: 1,275
Joined: 24-September 03
From: Benson, AZ
Member No.: 1,191
Region Association: Southwest Region
Seen a couple different approaches for exhaust on V6 & V8 teeners. Gettin ready to fab a Y-pipe for the SHO motor going into the 914. Want to run single exhaust down the right side, muffler in stock position, and single tail pipe out the back-left.

Curious to see different approaches there are for routing exhaust above or below the axles. Post pics!

Here's a picture of the 3.2L SHO motor.
Attached Image

TIA
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
pdlightning
post Feb 13 2012, 10:38 PM
Post #2


Pdlightning
**

Group: Members
Posts: 209
Joined: 4-February 11
From: Santa Clarita
Member No.: 12,660
Region Association: Southern California
QUOTE(3d914 @ Feb 13 2012, 07:52 PM) *

Seen a couple different approaches for exhaust on V6 & V8 teeners. Gettin ready to fab a Y-pipe for the SHO motor going into the 914. Want to run single exhaust down the right side, muffler in stock position, and single tail pipe out the back-left.

Curious to see different approaches there are for routing exhaust above or below the axles. Post pics!

Here's a picture of the 3.2L SHO motor.
Attached Image

TIA


I am also interested in the exhaust, but what are you going to do for the intake and filter?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
matthepcat
post Feb 13 2012, 11:25 PM
Post #3


Meat Popsicle
***

Group: Members
Posts: 1,462
Joined: 13-December 09
From: Saratoga CA
Member No.: 11,125
Region Association: Northern California
My 350 used to have one side cross under the oil pan meet up with the other side. This went through a 3" cat and a flow master in the stock location.

This configuration was great because no drone! Should have kept it.

Oh and it went under the axles (holds axles off the ground if your cv blows out!)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jimkelly
post Feb 14 2012, 10:21 AM
Post #4


Delaware USA
****

Group: Members
Posts: 4,969
Joined: 5-August 04
From: Delaware, USA
Member No.: 2,460
Region Association: MidAtlantic Region
drone - not sure i will ever grow accustomed to it (IMG:style_emoticons/default/sad.gif)

an upside to dual exhaust is that when hooked to a sniffer - you can see if one bank of 4 cylinders is buring different than the other.


Attached image(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
andys
post Feb 14 2012, 11:06 AM
Post #5


Advanced Member
****

Group: Members
Posts: 2,165
Joined: 21-May 03
From: Valencia, CA
Member No.: 721
Region Association: None
Over the axles.

Andys


Attached thumbnail(s)
Attached Image

Attached image(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
slothness
post Feb 14 2012, 11:58 AM
Post #6


It's business time
**

Group: Members
Posts: 110
Joined: 7-October 04
From: Valencia, CA
Member No.: 2,906
Region Association: Southern California
I went over the axles too for maximum lower-ability (IMG:style_emoticons/default/blink.gif)
Just beware if using block huggers...don't use em. The collector dumps right out on the shift rod on the drivers side, angling the bend is a true bitch. I wanted to go y-pipe also but I bought all my parts long ago before I discovered all my mistakes and couldn't return them. I ended up building a custom straight shift rod linkage per the Jwest design and now there is more room down there. Beware you might have to unexpectedly fabricate some items.

Ignore the poor welds, they dont leak (IMG:style_emoticons/default/smash.gif)

Attached Image Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Andyrew
post Feb 14 2012, 12:06 PM
Post #7


Spooling.... Please wait
**********

Group: Members
Posts: 13,380
Joined: 20-January 03
From: Riverbank, Ca
Member No.: 172
Region Association: Northern California
Above the axles is the only way to fly.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
slothness
post Feb 14 2012, 12:13 PM
Post #8


It's business time
**

Group: Members
Posts: 110
Joined: 7-October 04
From: Valencia, CA
Member No.: 2,906
Region Association: Southern California
Oh and the heat shields in Andys first pic is a recommended idea for going over the axles. I can probably roast a pig in my trunk on a 30 minute drive. mmmmm

You'll probably have less of a problem with that being a single side muffler, but its something to think about.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bulitt
post Feb 14 2012, 01:07 PM
Post #9


Achtzylinder
****

Group: Members
Posts: 4,189
Joined: 2-October 11
Member No.: 13,632
Region Association: South East States
QUOTE(andys @ Feb 14 2012, 12:06 PM) *

Over the axles.

Andys


Did you just weld up a bunch of pipes, have them bent, or is it the ass end of an available kit (like an axle back section of a mustang as an example)?
Thanks
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
andys
post Feb 14 2012, 01:20 PM
Post #10


Advanced Member
****

Group: Members
Posts: 2,165
Joined: 21-May 03
From: Valencia, CA
Member No.: 721
Region Association: None
QUOTE(bulitt @ Feb 14 2012, 11:07 AM) *

QUOTE(andys @ Feb 14 2012, 12:06 PM) *

Over the axles.

Andys


Did you just weld up a bunch of pipes, have them bent, or is it the ass end of an available kit (like an axle back section of a mustang as an example)?
Thanks


I bought stainless mandrel bends from Summit and TIG welded them together. Mufflers are FlowMaster 3 chambered for reduced interior noise.
A note on heat shielding: don't forget to shield the shocks in the event your muffler or pipe is close; no need to heat up the shocks un-necessarily. Can't see it in the photo, but there's a shield between the shock and the muffler.

Andys
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Andyrew
post Feb 14 2012, 01:22 PM
Post #11


Spooling.... Please wait
**********

Group: Members
Posts: 13,380
Joined: 20-January 03
From: Riverbank, Ca
Member No.: 172
Region Association: Northern California
Muffler shop. 5 years ago they did mine for 300 including 2 magnaflows and resonated tips.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
computers4kids
post Feb 14 2012, 10:28 PM
Post #12


Love these little cars!
****

Group: Members
Posts: 2,443
Joined: 11-June 05
From: Port Townsend, WA
Member No.: 4,253
Region Association: None
No drone, over the axles and a crossover pipe with SBC
(IMG:http://www.914world.com/bbs2/uploads/post-4253-1233890821.jpg)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
3d914
post Feb 18 2012, 09:37 AM
Post #13


Senior Member
***

Group: Members
Posts: 1,275
Joined: 24-September 03
From: Benson, AZ
Member No.: 1,191
Region Association: Southwest Region
Great feedback guys, thanks. Above the axles it is. I wanted to keep the exhaust as close to the trunk as reasonable and was concerned about heat. I'll plan for some kind of shielding - similar to the stock muffler shield welded to the underside. That keeps it off the exhaust.

QUOTE(pdlightning @ Feb 13 2012, 09:38 PM) *


I am also interested in the exhaust, but what are you going to do for the intake and filter?


pd, The intake will use the stock manifold as shown, fed by straight tubing from the rear of the trunk where a naca duct will draw intake air in. The MAF sensor will sit between the filter box, under the naca duct, and the throttle body. I'll also have to fab a metal or FG riser to the forward part of the trunk/engine lid to cover the exposed throttle body.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914.SBC
post Feb 18 2012, 11:21 AM
Post #14


Member
**

Group: Members
Posts: 248
Joined: 12-December 10
From: CORONA, CA
Member No.: 12,479
Region Association: None
(IMG:style_emoticons/default/beer3.gif)


Attached image(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
TC 914-8
post Feb 18 2012, 06:52 PM
Post #15


Senior Member
***

Group: Members
Posts: 833
Joined: 23-May 08
From: Sequim, WA
Member No.: 9,090
Region Association: Pacific Northwest
My car now, SBC goes over the axles, never thought about the heat in the rear trunk (IMG:style_emoticons/default/confused24.gif) I'll have to check it out. this does give better clearance and more roome for mufflers.
My first 914 had a Capri V-6, I went under the axles and used a bursch exhaust, dual in, single out left side. It sounded just like a Porsche 6. Hot and loud once it aged and blew out the FG glass packs.
The single chrome 2-1/4 outlet was very 6ish. yes, I was a poser in the 80's, and still can't afford the real deal 6 (IMG:style_emoticons/default/hissyfit.gif)
Your Ford SHO is the bomb (IMG:style_emoticons/default/aktion035.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
3d914
post Feb 18 2012, 07:49 PM
Post #16


Senior Member
***

Group: Members
Posts: 1,275
Joined: 24-September 03
From: Benson, AZ
Member No.: 1,191
Region Association: Southwest Region
Thanks for the encouragement. TC - got some pics?

914.sbc - nice test stand for the engine. I think I overdid it with mine. I wanted it to be able to stand up on end for storage. Found a design on the net and modified it.

Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
3d914
post Feb 18 2012, 08:01 PM
Post #17


Senior Member
***

Group: Members
Posts: 1,275
Joined: 24-September 03
From: Benson, AZ
Member No.: 1,191
Region Association: Southwest Region
Here's the mockup pics for the down pipes from the two headers that will merge into a single 2.5" exhaust. Fortunately it merges on the right side, away from the shift bar. PVC is 2in ID - same as mandrels.

Left side. Piece of 1.5" square steel represents the engine bar. Don't want to weld it until I test fit in the engine bay.
Attached Image

Front. Could have come straight down with the right pipe, but need an extra inch of clearance when its on the engine cradle during testing.
Attached Image

Right - well already see something I'll need to fix. Mockup's doing its job.
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
matthepcat
post Feb 18 2012, 08:03 PM
Post #18


Meat Popsicle
***

Group: Members
Posts: 1,462
Joined: 13-December 09
From: Saratoga CA
Member No.: 11,125
Region Association: Northern California
Good idea using PVC pipe. Also great choice merging into a single pipe, as it is one of the easiest ways to have NO drone.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
3d914
post Feb 18 2012, 10:12 PM
Post #19


Senior Member
***

Group: Members
Posts: 1,275
Joined: 24-September 03
From: Benson, AZ
Member No.: 1,191
Region Association: Southwest Region
matt, can you elaborate on the "drone"?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
matthepcat
post Feb 19 2012, 12:41 AM
Post #20


Meat Popsicle
***

Group: Members
Posts: 1,462
Joined: 13-December 09
From: Saratoga CA
Member No.: 11,125
Region Association: Northern California
Drone is when your exhaust creates a harmonic vibration often changing depending on RPM and engine load. Conversions with "true dual" exhaust routing seem to suffer from an aggressive version of this problem.

Ever ride in a hotrod with no carpet, and 2chamber flow masters that dump at the rear axle?

Drives you crazy on a longer drives.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

2 Pages V  1 2 >
Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 22nd June 2025 - 05:51 AM
Invision Power Board v9.1.4 © 2025  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...