Small V large bore tail pipes?

[Nambo]

I like the sound of my vehicle and wish to turn the volume up slightly. I already have Monarchs tubular manifold fitted, I saw Tony Hart selling straight through silencers so bought a pair, only to find they hardly make any difference to the silencers I took off, I could see why when I found my old silencers were also straight through!, so that was a waste of time any money! How quiet are standard Stags?, I though mine was rather too refined sound wise.
My question therefore is, I have small bore tail pipes, see picture, what are the pros and cons of these compared to larger bore regarding performance, sound and fuel consumption?
I also attach a picture of the Langford silencers I took off to enquire what I might expect to get if I sold these?, (subject to the new silencers not being a negative performance wise).

DSC01032.jpgDSC01035.jpgDSC01037.jpg

[Carboy0]

I have no experience on the Stag other than the recent change to tubular manifolds which have made it a lot more throaty IMHO. However on another classic I went to a large bore system that whilst not very loud, set up an awful drone when cruising at A road speeds 50-70 mph. Any more than 10 - 15 minutes required some rock-band quality industrial ear plugs, needless to say I switched back to the previous arrangement, so there is something as too much.

[StagnJag]

I would say the difference is purely asthetic. I changed from small bore to large bore and couldn't tell the difference acoustically. Other stag owners have commented on how quiet my stag is, i want it a bit louder! I have tubular manifolds too.


Rgds

Dave

[brian0443]

There has been a lot written on this theme over the years. Try a search for 'silencers' whilst waiting for further responses.
Brian

[mike@thenook]

Hi Nambo,

I have tubular manifolds (Phoenix) with TH's Bell silencers and a recent Robsport big bore tailpipe - seems plenty loud to me when you get moving but on normal throttle openings quite acceptable - definitely louder than a standard system though.

The Langford systems were always rather well regarded in tuning and the New Tricks Stag had a complete Langford system fitted.

[Lingen]

Dave.
Regarding the large and small tailpipes on stainless steel systems, the only difference between them is the outer bore size right at the end, which is unlikely to have any noticeable effect on noise. On the original mild steel tailpipes, the larger bores at the end were actually silencers of a sort, as the centres were perforated metal, behind which was something that looked like glass wool. These did make quite a difference to the exhaust note.
Mike.
.

[Stagdad]

Dave.
Regarding the large and small tailpipes on stainless steel systems, the only difference between them is the outer bore size right at the end, which is unlikely to have any noticeable effect on noise. On the original mild steel tailpipes, the larger bores at the end were actually silencers of a sort, as the centres were perforated metal, behind which was something that looked like glass wool. These did make quite a difference to the exhaust note.
Mike.
.

image.jpgMy large bore tail pipes illustrating what Mike has mentioned. I've got 4 of them and it's not quiet.

[new to this]

[ATTACH=CONFIG]40996[/ATTACH]My large bore tail pipes illustrating what Mike has mentioned. I've got 4 of them and it's not quiet.

the tail pipes are the silencers

[Nambo]

Hi Nambo,

I have tubular manifolds (Phoenix) with TH's Bell silencers and a recent Robsport big bore tailpipe - seems plenty loud to me when you get moving but on normal throttle openings quite acceptable - definitely louder than a standard system though.

The Langford systems were always rather well regarded in tuning and the New Tricks Stag had a complete Langford system fitted.

Hi Mike, I presume you mean this https://robsport.co.uk/index.php/onl...-twin-tailpipe , did you fit it and right away notice a difference or fit it in conjunction with other items?, I presume its not silenced like the posts after yours suggest?
What was the "New Tricks Stag"?
Cheers
Pete

[mike@thenook]

Hi Pete,

Yes, that's the one and I bought it to replace another large bore one which had a broken bracket - wasn't worth welding. In my opinion the sound generated by the large bore is a little greater than that of the small having had both but there's no diffference to performance/consumption. Also, I noticed the Robsport ones to be a little louder than the old ones but that's probably just due to the older ones being full of soot, oil and whatever attaches to the inner pipework.
the New Tricks Stag was the green one driven by Dennis Waterman in New Tricks on ITV I think - it was for sale on eBay I think recently.

cheers

[mole42]

If anyone whose exhaust is too quiet would like to swap, mine is too loud and I'd like to change it for a quiet one.

Richard

[Nambo]

If anyone whose exhaust is too quiet would like to swap, mine is too loud and I'd like to change it for a quiet one.

Richard

What components does your loud exhaust system consist of please?

[mole42]

It's a stainless system that was already fitted when I bought the car. Big bore tailpipes.

[Guest]

I like the sound of my vehicle and wish to turn the volume up slightly...
How quiet are standard Stags?, I though mine was rather too refined sound wise.

My question therefore is, I have small bore tail pipes, see picture, what are the pros and cons of these compared to larger bore regarding performance, sound and fuel consumption?

Sound, noise.....what a topic!

People spend fortunes to get the right noises on high end audio systems!
Sometimes 100 grand+

If you look at the other thread, you will understand getting any changes to exhaust performance is defined by the strangulation of the exhaust port up there near the valve, then the extremely limited breathing allowed into the engine by the amazing labyrinth under the Stromberg bucket brigade.

No amount of fiddling downstream is going to make any difference.
If you want more exhaust note, you simply need more compression and combustion.
So, a high compression later stag will make a good deal stronger exhaust note than a low compression (dished piston) one.
No doubt fitting a multi barrel weber carb will make the thing a lot louder generally.

The original twin rear tail pipe on the Stag like on the GT6 Mk3 is supposed to have a damper in it, which drops the amount of irritating high frequency zaaaaazzzzzz which is then masked by the low frequency noise. They were MILD STEEL.
Those were designed to get it through type approval 87dB noise testing. Note!

Stainless steel because it has half the thermal conductivity of mild steel increases the exhaust noise by at least 3-4dB, which means it's TWICE AS LOUD.

2:1 2 +6.02 dB +3.01 dB

Read this:-

http://www.sengpielaudio.com/calculator-gainloss.htm

If you know anything about mp3 and masking effects in music digitization, you will know it's the louder noise masks the quieter noise.
What you hear, and what other people outside the car hear are 2 totally different things.

If you remove the damping of the high frequencies, it's that ragged waveform that does your ears in, and becomes fatiguing, while a loud low frequency resonance is filtered out ultimately by the brain, as it learns to expect it.

The tail pipe filter is more than ever essential on the STAG with S/S systems, but nobody bothers any more.

Another interesting issue.
A small bore V8 because it tends to rev quite high, has a quite high exhaust note.
This is because on each cycle there are twice as many cylinders firing compared with a cooking 4 cylinder family car.
The stag has a unique sound signature because it has a quite unusual combination of elements, SOHC, small size and traditional UNEVEN firing order.

I like them, but I have always liked musical cars such as that other great anachronism the Jaguar E type V12.

A stag can't sound like a Ferrari V8 because they have a FLAT crankshaft - sound like 2, 4 cylinder engines, with even firing order, so they sound tinny and harsh, (sort of like Ferrari all over really!)

Be happy, no amount of UBER-GERMAN engineering in some of the most expensive audio labs in the world is capable of making as pleasing a sound as a traditional 70s British Coventry made sports car.
They have tried and failed every time, and they have tried ad nauseam....

This is funny.
Some of the best sounding German cars were all old 6 cylinder 1980s variants like the M1 3.5L, and the gorgeous sounding 2.7L & 3.5L Alpinas and the 325i.

[TR5convalescent]

+1 for the 325i. A pal had one with a standard layout SS exhaust and was lovely!