Alternative exhaust for V6

Alternative exhaust for V6

Author
Discussion

robinlarry

Original Poster:

113 posts

111 months

Monday 2nd March 2015
quotequote all
I'm wondering if anyone has converted to a single 2.5" diameter exhaust from the dual 1.75 currently used. The area would be approximately the same and it seems a single pipe would provide a bit of weight reduction.

Jed-S

660 posts

215 months

Monday 2nd March 2015
quotequote all
I did have one made when I had my S but unfortunately I don't seem to have any photos other than what was on this page.

http://deadpineapple.net/tvr/exhaust.php

I wanted an exhaust that wasn't going to be excessively loud and went for a single pipe because it was easier to manufacture and I quite liked the look. However the subsequent owner appeared to disagree and when I saw it advertised last year it was back on a twin exit system.

v8s4me

7,234 posts

218 months

Monday 2nd March 2015
quotequote all
robinlarry said:
........ The area would be approximately the same and it seems a single pipe would provide a bit of weight reduction.
Is it the area/volume which is important or is it something to do with the back pressure and there needing to be one pipe per bank to get the balance right? I don't know so I'm just asking.

phillpot

17,105 posts

182 months

Monday 2nd March 2015
quotequote all
This is my "home made" exhaust using a mild steel nos V8S system I picked up for a bargain on Ebay. Picture taken before tailpipes were straightened to bring them closer together like original V6 system.....




I found it to be too noisy, a horrible sort of droning resonance or whatever in the car, so I shortened the "hockey sticks" and dropped a Cherry Bomb in which improved things enormously (imho) ears





I've been told it sounds ok (nothing like a Granada) wink

Edited by phillpot on Monday 2nd March 23:16

DamianS3

1,803 posts

181 months

Monday 2nd March 2015
quotequote all
I wonder what it would sound like..?

I remember I read that bmw used twin exhausts on the inline 6 because 2 smaller bore pipes had higher gas velocity than one large one. This was beneficial under certain conditions but can't remember what those were... Torque low down maybe ? I also read that tuning a v6 is typically done as 2 independent exhausts possibly with an X pipe.

My cosworth just had a 3" bore system but this was t35 inline 4.

I think it would probably ok not really my cup of tea but whatever floats your boat.. It may end up sounding like a Granada however..

Damian S3

v8s4me

7,234 posts

218 months

Monday 2nd March 2015
quotequote all
phillpot said:
......I've been told it sounds ok ...
It's lovely...like a distant Spitfire thumbup Not as good a a V8 obviously, but a lovely noise all the same smile

phillpot

17,105 posts

182 months

Monday 2nd March 2015
quotequote all
v8s4me said:
is it something to do with the back pressure and there needing to be one pipe per bank to get the balance right?
Never cut an original open but I'd guess the two inlet pipes in effect become one once inside the big box bit?





mep12345

2,061 posts

200 months

Tuesday 3rd March 2015
quotequote all
The previous owner of mine went the other way, 4 tailpipes split to either side of car like a triumph stag. It is quieter than the standard but has a great sound imho and looks good. Also has advantage that it doesn't need removing for work around diff, uj and handbrake cable area. See here www.gbsportscar.com

AutoAndy

2,265 posts

214 months

Tuesday 3rd March 2015
quotequote all
phillpot said:
Never cut an original open but I'd guess the two inlet pipes in effect become one once inside the big box bit?
Inside...

...would normally be packed with wadding as well... wink

Alan Whitaker

2,054 posts

181 months

Tuesday 3rd March 2015
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Hi Mike
You could have got them in Stainless Steel, Have 2 of these.

Alan


phillpot

17,105 posts

182 months

Tuesday 3rd March 2015
quotequote all
Alan Whitaker said:
Hi Mike
You could have got them in Stainless Steel
Very nice but mine takes a bit of a bashing when it bottoms out (now has a protective "skid" welded along the bottom), would be a shame to trash a stainless one smile

Kitchski

6,514 posts

230 months

Tuesday 3rd March 2015
quotequote all
AutoAndy said:
Inside...

...would normally be packed with wadding as well... wink
Cheers for that, it saved me cutting one up!

robinlarry

Original Poster:

113 posts

111 months

Wednesday 4th March 2015
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How about a straight pipe with a Supertrapp?

phillpot

17,105 posts

182 months

Wednesday 4th March 2015
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Yeah, go for it!


Super Trapp

Kie s2

289 posts

144 months

Wednesday 4th March 2015
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Supertramp. Great band choice guys , with the splendid Breakfast in America , don't tell Glen , he will drive there ... smile

glenrobbo

35,077 posts

149 months

Thursday 5th March 2015
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Kie s2 said:
Supertramp. Great band choice guys , with the splendid Breakfast in America , don't tell Glen , he will drive there ... smile
As soon as those couriers deliver my exhaust, I'm on it! thumbup
Logically, you'd think they'd give a little bit. Or am I a dreamer?


Still waiting...........

It's raining again...... frown

weeping

Edited by glenrobbo on Thursday 5th March 01:12

Alan Whitaker

2,054 posts

181 months

Thursday 5th March 2015
quotequote all
robinlarry said:
and it seems a single pipe would provide a bit of weight reduction.
Hi All
TVR were quite clever with the design of the S exhaust, first it had to fit into a tight space, they also incorporated a silencer, which gave it a sound unique to the S, It has a very crude X pipe design to give it low down torque (grunt), its the design of 2 into 1 back into 2 that dose the trick, if you just did a 2.5 single pipe on a V6 or V8 you might loose some of the low down torque. A good twin pipe with a X pipe will deliver the best torque and with the right boxes also produce a deep clean rumble.
wouldn't worry about the weight reduction.

Alan

phillpot

17,105 posts

182 months

Thursday 5th March 2015
quotequote all
Alan Whitaker said:
its the design of 2 into 1 back into 2 that dose the trick.

Alan
From the snippets of information I've picked up over the years I thought V engines should have at least a balance pipe between the two banks but while Googling Capri systems to get some ideas for my Taimar it appears they "like" two totally separate pipes scratchchin

For example.....

Alan Whitaker

2,054 posts

181 months

Thursday 5th March 2015
quotequote all
Hi Mike
You can do this but you do not get exhaust scavenging like you do with a X pipe system, gases will take the least resistance, at the X pipe both banks of exhaust will bleed into each other allowing gas pulses to follow the least resistance which will pull following gasses out of the system, a bit like creating a small vacuum in front of the next cylinder pulse, this will scavenge all the cylinders allowing better cylinder filling and exhaust gas removal.

Exhaust, It's a long debated subject, X or H pipe, each tuner or manufacture has there own options which is best, bit like a mine field of info.


Alan