Alfa Pages

paddy granger · Alfa Sprint Joined: 12 Aug 2003 Posts: 248

Yesterday we were performing some experiments, using the Alfa 33 as a test car, in order to determine the best way to record sounds. The experiment was serious, but we had great fun!

Thought you guys may like to hear some of the results, so I have posted two mp3 sounds files here!!

Exhuast muffler - an aftermarket ragazzon part:

http://www.granger-marketing.com/alfa33/muffler.mp3

Under bonnet recording:

http://www.granger-marketing.com/alfa33/driving_underbonnet.mp3

Ken McCarthy · Posted: Sun Oct 24, 2004 1:11 am Post subject: Alfa 33 - boxer sounds!

Inlet valve on No 3 cylinder sound a bit off.
_________________
Ken McCarthy - 16V Sprint

paddy granger · Alfa Sprint Joined: 12 Aug 2003 Posts: 248

Ken

Is that based on the under bonnet sound? If so, how can you tell?

gritsop · Posted: Sun Oct 24, 2004 11:52 am Post subject:

Hi,

Patrick , on the second mp3 do you close the bonnet and then you set off? I think I hear sound from the external environment.

Cool, very good job.

Regards,
_________________
Thanassis Gritsopoulos
1991 Alfa 33 1.4 IE
2001 Alfa 147 1.6 Distinctive

http://www.alfa-restoration.co.uk
Parts Shop: www.alfa-restoration.co.uk/shop

gritsop · Posted: Sun Oct 24, 2004 11:53 am Post subject:

Hi,

Patrick , on the second mp3 do you close the bonnet and then you set off? I think I hear sound from the external environment.

Cool, very good job.

Regards,

EDIT: I also experience the forum indicating debug mode as Bill reported yesterday. (Administrator do you hear???)
_________________
Thanassis Gritsopoulos
1991 Alfa 33 1.4 IE
2001 Alfa 147 1.6 Distinctive

http://www.alfa-restoration.co.uk
Parts Shop: www.alfa-restoration.co.uk/shop

paddy granger · Alfa Sprint Joined: 12 Aug 2003 Posts: 248

Yeah, thats right. It was quite difficult to get the pure engine sound. There is always a bit of road noise. The sound was actually recorded using a basic digital camera with a video option. The sound was then extracted from the mpeg file.

The camera was located in the closed area of the bonnet, between the heater and the wall. You can hear the sound volume decrease a bit when the bonnet is closed, due to the rubber seal closing the compartment off.

The muffled sound that occurs when the car is accelerating in second gear is coming from the air filter box. We need to find a air induction pipe, as the original one had perished - with it removed, there is far more of an induction noise.

PS - about the debug problem. If you get this after posting, you should just go back to the forum as usual. The message has still been posted.

paddy granger · Alfa Sprint Joined: 12 Aug 2003 Posts: 248

BTW - I was passenger. My brother was reving the engine slightly before I closed the bonnet.

Ken McCarthy · Posted: Mon Oct 25, 2004 12:28 am Post subject: Sounds

Patrick

Just my idea of a joke. Stop worrying about your engine. Great sounds.

Best regards,
_________________
Ken McCarthy - 16V Sprint