The sound of the Twin Spark - Alfa Romeo Forum
You are currently unregistered, register for more features.    
Reply
 
Thread Tools
(Post Link) post #1 of 38 Old 04-06-09 Thread Starter
Status: -
AO Member
 
zambugsky's Avatar
 
Join Date: Jul 2007
Location: Congo, Democratic Republi
County: -
Posts: 848

Member car:

None yet

The sound of the Twin Spark

I've always wondered what gives the FIRE-based 16V Twin Spark its lovely roar when it's pushed hard. There's the initial burble and cammy ticking at idle, at least on the 2 liter, and then beyond 4000 rpm the engine sounds like it's taken a huge gulp of air. Past 6000 rpm the sound hardens to a gorgeous metallic roar... wicked

I'm thinking of changing to a decatted header, removing the pre-cats while keeping the main cat. Would this change the noise coming from up front or would it balance it out with more noise from the rear? I'd rather not sound like a chavved-up Civic
zambugsky is offline  
Sponsored Links
Advertisement
 
Status: zzzzzzzz
AO Platinum Member
 
symon's Avatar
 
Join Date: Dec 2005
Location: United Kingdom
County: Oxfordshire
Posts: 37,076
Quote:
Originally Posted by zambugsky View Post
I've always wondered what gives the FIRE-based 16V Twin Spark its lovely roar when it's pushed hard. There's the initial burble and cammy ticking at idle, at least on the 2 liter, and then beyond 4000 rpm the engine sounds like it's taken a huge gulp of air. Past 6000 rpm the sound hardens to a gorgeous metallic roar... wicked

I'm thinking of changing to a decatted header, removing the pre-cats while keeping the main cat. Would this change the noise coming from up front or would it balance it out with more noise from the rear? I'd rather not sound like a chavved-up Civic
I am not sure how they got it to sound like it does, but it is certainly one of the best if not the best sounding inline 4 cylinder engine fitted to a car.

The only thing I can say is that if you modify the exhaust and induction that is generally what you will hear instead, not the engine itself. Although just removing the Pre-cats should affect it too much as long as you keep the rest of the exhaust the same.

By the way, the 1.2 16V FIRE engine in my Bravo sounds nothing like a TS, it sounds ok, but it isn't really in the same league noise wise.

Whatever Alfa did they did something special.

Giulietta 2.0JTDm (170)
symon is offline  
Status: -
AO Member
 
itacarboy's Avatar
 
Join Date: Oct 2007
Location: United Kingdom
County: Herefordshire
Posts: 871
2 words

MAD ITALIANS
itacarboy is offline  
Darren156
Status: - Update
Guest
 
Posts: n/a
It is a great sounding engine, I've had both the 156 2 Litre Twinny and the GTV 2 Litre Twinny, both sounded superb,
 
Status: [Too Long]
AO Silver Member
 
crespo2121's Avatar
 
Join Date: Oct 2008
Location: United Kingdom
County: Dorset
Posts: 1,109
I think the pre cats do have a muted effect on the exhaust system. I have heard pre 01 twinys and they definately sound more raspy than my twiny with pre cats. I want mine to have that italian raspy sound but not too noisy. Very difficult to achieve it seems as most exhaust systems and back boxes are too noisy for my liking. And bloody expensive as well.
crespo2121 is offline  
Darren156
Status: - Update
Guest
 
Posts: n/a
My GTV was a 1997 model and sounded AMAZING when pushed. Did 130MPH in that car once and she LOVED it!!!
 
Status: Rebuilding series 3 landy, nearly there!
AO Member
 
UKSPF's Avatar
 
Join Date: Nov 2008
Location: United Kingdom
County: Torfaen
Posts: 299

Member car:

145 Cloverleaf

I too love the noise of my 145qv, especially with my stainless system. Sounds monsterous, especially at the more "spirited" speeds
UKSPF is offline  
Status: -
AO Member
 
machvingtsun's Avatar
 
Join Date: Sep 2008
Location: Ireland
County: -
Posts: 75

Member car:

156

I think the variator and varible length manifold contribute a lot to the sound. The changes in the sound seem to occur at switchover points like a VTEC.
machvingtsun is offline  
Smallville
Status: - Update
Guest
 
Posts: n/a
Well I love the sounds of mine, I dont have a variator and it still sounds sweet
 
Status: Meh.
AO Platinum Member
 
NineOneSix's Avatar
 
Join Date: Dec 2006
Location: United Kingdom
County: Hertfordshire
Posts: 30,067
Garage

Member car:

GTV V6 3.0

Quote:
Originally Posted by machvingtsun View Post
I think the variator and varible length manifold contribute a lot to the sound. The changes in the sound seem to occur at switchover points like a VTEC.
the variable inlet manifold is barely noticable really, my 155 TS souded the nuts and that had the older fixed aluminium manifold
NineOneSix is offline  
Status: Meh.
AO Platinum Member
 
NineOneSix's Avatar
 
Join Date: Dec 2006
Location: United Kingdom
County: Hertfordshire
Posts: 30,067
Garage

Member car:

GTV V6 3.0

heres mine, its an old vid as its currently off the road.

PS sorry for the bad camera angle, it was a trial run of the camera

155 test vid video by explosive-alfa - Photobucket
NineOneSix is offline  
Status: zzzzzzzz
AO Platinum Member
 
symon's Avatar
 
Join Date: Dec 2005
Location: United Kingdom
County: Oxfordshire
Posts: 37,076
The noise of the TS has to be caused by the combination of the cam timing, the speed at which the valves open/close, and the exhaust/inlet port shapes.

IIRC one inlet valves opens very slightly before the other, and this might help give the engine its characteristic sound.

I know that the inlet manifolds probably don't make any difference, as fixed and variable manifold versions sound similar.

Also CF1/2 and CF3 versions sound pretty similar so that rules out the exhaust manifolds too..
symon is offline  
Status: Zoe FTW
AO Rosso Alfa Member
 
baby278278's Avatar
 
Join Date: Jul 2007
Location: United Kingdom
County: Essex
Posts: 46,602
You can listen to my 2.0 twin spark
YouTube - Alfa 145 Exhaust
baby278278 is offline  
Status: zzzzzzzz
AO Platinum Member
 
symon's Avatar
 
Join Date: Dec 2005
Location: United Kingdom
County: Oxfordshire
Posts: 37,076
Quote:
Originally Posted by baby278278 View Post
You can listen to my 2.0 twin spark
YouTube - Alfa 145 Exhaust
Sounds very nice Katy, however even with a standard exhaust the engine sounds brilliant for a 4 cylinder.
symon is offline  
Status: Zoe FTW
AO Rosso Alfa Member
 
baby278278's Avatar
 
Join Date: Jul 2007
Location: United Kingdom
County: Essex
Posts: 46,602
Quote:
Originally Posted by symonh View Post
Sounds very nice Katy, however even with a standard exhaust the engine sounds brilliant for a 4 cylinder.
Oh yes it did sound good before

Now it sounds epic You should see the heads turn going thru built up areas...im like a child
baby278278 is offline  
Status: -
AO Member
 
jungleman's Avatar
 
Join Date: Nov 2008
Location: United Kingdom
County: Greater London
Posts: 170

Member car:

'98 2.0 156 SP2

there is some thing abou the twinny that makes it sounds amazing, ive not been in any other 4 cylinder car that sounds quite like it, its that point at about 3k where the note changes and becomes more aggresive, love it and always puts a huge smile on my face!!
jungleman is offline  
Status: -
AO Silver Member
 
corbo's Avatar
 
Join Date: May 2008
Location: United Kingdom
County: Somerset
Posts: 1,610
My car had a gashed up stainless exhaust system on it. I took it back to standard and it actually sounded a lot better because I could enjoy the engine noise again!
corbo is offline  
Status: zzzzzzzz
AO Platinum Member
 
symon's Avatar
 
Join Date: Dec 2005
Location: United Kingdom
County: Oxfordshire
Posts: 37,076
Quote:
Originally Posted by corbo View Post
My car had a gashed up stainless exhaust system on it. I took it back to standard and it actually sounded a lot better because I could enjoy the engine noise again!
Thats the thing, if you alter the exhaust or the intake, that is what you hear and not the engine.

All inline 4 cylinder cars with sporty exhaust all sound pretty much the same.
symon is offline  
Status: Meh.
AO Platinum Member
 
NineOneSix's Avatar
 
Join Date: Dec 2006
Location: United Kingdom
County: Hertfordshire
Posts: 30,067
Garage

Member car:

GTV V6 3.0

wait till mine has its one fitted, its going to be kinda err loud

for race purposes
NineOneSix is offline  
Status: -
 
Join Date: Nov 2008
Posts: 314
My workhorse Fiat has a FIRE 1.2 16v engine. The basic engine sound is completely different to the TS, but it does sound quite aggressive for a lawnmower engine . Pushing the 1.2 Fiat engine is quite enjoyable, especially at high revs (4K and above).

The 1.2 FIRE has reasonably good low-end torque for a small engine. By stark contrast, the 1.8TS is gutless below 2,500 rpm. The sound of both engines at high revs is good, but the TS is miles better. The TS is also a much nicer sounding engine, overall. At idle revs, the TS makes a beautiful humming/droning sound ... just like a racing car at idle! The 1.2 FIRE makes a very average sound at idle
AlfaHedgehog is offline  
Damien_C
Status: - Update
Guest
 
Posts: n/a
My 1.4 sounds great Very growly from 2-3k revs and then climbs to being loud up high.
 
Status: -
AO Member
 
itacarboy's Avatar
 
Join Date: Oct 2007
Location: United Kingdom
County: Herefordshire
Posts: 871
ha ha wanna hear my GTV 2.0 with a stainless 2 box system with the decat on, i was on first name terms with the po-lice, mr pc plod loved me ha ha
itacarboy is offline  
Status: wondering what to tweak next...
AO Silver Member
 
Join Date: Sep 2007
Location: United Kingdom
County: North Yorkshire
Posts: 2,793

Member car:

Alfa 156 GTA

the sound of my 2.0 TS (although it has sports cat and CSC backbox) was greatly altered to give a much more..."Italian" resonance by fitting the wizrdovoz manifold, which i believe has a 2.5" downpipe(after collector) compared to the standard 2.25" one...
aziraphale is offline  
Status: -
AO Gold Member
 
Join Date: Jul 2006
Posts: 7,179
Quote:
Originally Posted by Damien_C View Post
My 1.4 sounds great Very growly from 2-3k revs and then climbs to being loud up high.

Very true, the 1.4 and 1.6 units in my opinion sound the best of the 4 pots, the 2 litre the worst.

Its the cylinder head design and the inlets/ exhausts that maketh the noise you hear, as all angines are basically air pumps at the end of the day.
cj romeo is offline  
Status: zzzzzzzz
AO Platinum Member
 
symon's Avatar
 
Join Date: Dec 2005
Location: United Kingdom
County: Oxfordshire
Posts: 37,076
Quote:
Originally Posted by cj romeo View Post
Very true, the 1.4 and 1.6 units in my opinion sound the best of the 4 pots, the 2 litre the worst.

Its the cylinder head design and the inlets/ exhausts that maketh the noise you hear, as all angines are basically air pumps at the end of the day.
They all have the same cylinder heads though.
symon is offline  
Reply

Go Back   Alfa Romeo Forum > Supported Alfa Romeo Models > Technical & Vehicle Assistance > Engines (TS, JTS, JTD & V6)

Tags
sound , spark , twin

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Misfiring Twin Spark alphabravo Alfa GTV & 916 Spider 10 19-04-11 08:38
An Article on "The new 2.0 liter 16 valve twin spark Alfa Romeo engine" Nicky General Alfa Discussion 4 18-03-09 14:57
Can you insure a Twin Spark engine? In_The_Pass Engines (TS, JTS, JTD & V6) 10 18-09-08 00:01
156 2.0 Twin Spark Engine DaveTwinSpark Engines (TS, JTS, JTD & V6) 31 11-01-08 11:39
Thinking of a 147 - advice please BenH Alfa 147, 156 & GT 23 07-09-06 20:29

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 
For the best viewing experience please update your browser to Google Chrome