Skip to content
Aussieveedubbers

Induction Noise

0 likes
Share Share on Facebook Share on X Share on Reddit
Log in to reply

landfall Officially Full-On Dubber

290 posts · joined Jun 2014 ·

#1017751
Having just fitted a pair of Weber 34 ICT's to my bug, the induction noise is quite loud. No complaints about jetting or performance, just the induction noise.

Now I am thinking it may have something to do with the firing order of the engine?

Can somebody give me their opinion about fitting dual throat 40mm Webers instead? Would they be as noisy or less?

OZ Towdster Keen to finish some projects

1,921 posts · joined Dec 2003 ·

#1017753
Webers will be worse if you don't already like the ICT's .
The solution is to fit some QUALITY sound insulation to the engine side of the firewall panel , and i don't mean some crap you buy at your local auto shop , it will need to be approx 25mm thick foam with a vynal barrier also in it for best results which will give noise absorbsion and a barrier to help stop it moving through your firewall .
And how do i know this otherwise useless information , yep i worked in acoustic engineering for some 10 odd years a while back
Don't let body work get in the way of real suspension travel

psimitar Son of Jim - Creator of Good

2,506 posts · joined Jan 2009 ·

#1017755
And make some jute pillows for the inner roof channels that lead sll the way up from the engine bay. You'd be surprised how much noise can travel up them into the headlining 🙂
madness is in the eye of the beholder 👍

Camo Custom Title Time!

1,936 posts · joined Oct 2007 ·

#1017757
psimitar wrote:And make some jute pillows for the inner roof channels that lead sll the way up from the engine bay. You'd be surprised how much noise can travel up them into the headlining 🙂
My thoughts are that the sound travelling up the 'C' pillars is the main culprit, having experienced this in my Beetle. I had twin 45 webers and you couldn't really talk to the passenger. With that said, I had removed all the expanding foam that someone had put in there and now have nothing.

Went to efi, turbo and that quitened it down 😉👍😂😂😂
I thought rebuilding a VW would be cheap - Shit I was wrong, just don't let the wife know !!!!

Click here for my (slowy) modded 1961 Beetle build.

Bizarre Moderator The artist formerly known as blue74l

12,789 posts · joined Aug 2002 ·

#1017761
Making up a centre mounted air cleaner like the CSP setup reduces noise dramatically
Futue te ipsum!!!

psimitar Son of Jim - Creator of Good

2,506 posts · joined Jan 2009 ·

#1017768
A good quality tarboard in the engine bay that includes the side engine trays will also help the enclose the soundwaves within the engine bay. It's all well and good fitting deadener and absorber to the inside of the firewall, and should also be done, but reducing the soundwaves that actually hit the firewall is a big difference.
madness is in the eye of the beholder 👍

landfall Officially Full-On Dubber

290 posts · joined Jun 2014 ·

#1017772
Thanks for the replies.

It seems that I will have to live with it, or rather the wife will have to get used to it, I rather like it.

OZ, I have gutted the car and applied Dynamat everywhere followed by a quality sound insulation covering (definitely not cheap junk), on the fire wall it is on both sides and also on the sides of the engine bay. Plus the underside of the guards and floor pan have been sprayed with sound deadener.

I have thought about the centre mounted air filter system, but have also read somewhere that the foam socks over the air filters may help.

Had 45mm DCOE Weber on our mini and it appeared to be about the same noise level.

waltermitty Legend when my beer goggles are on

1,993 posts · joined Aug 2002 ·

#1017773
change your cam
23 windows ...8 too many!

grumble Son of Jim - Creator of Good

2,672 posts · joined Jun 2008 ·

#1017774
Just practice saying eh, what? answering different snippets of conversation and things like you see happening in nursing homes so that you are ready for the inevitable hearing reduction that comes with this.🤪 👍👍 Bizzarre is right the centre mount filter definitely helps.

1303Steve Scirocco Rare

8,650 posts · joined Aug 2002 ·

#1017781
Hi

I have to agree, fit a centre air box and run tubes into it from each carb, a late Beetle plastic airbox would be idea.

The nice sound would still be there just subdued a little

Stevel

1303Steve Scirocco Rare

8,650 posts · joined Aug 2002 ·

#1017791
Dont buy one of them, it wouldnt be hard to make

landfall Officially Full-On Dubber

290 posts · joined Jun 2014 ·

#1017792
Steve, I'll give it some thought for sure. Thanks

I've looked at the Bernie Bergman site with interest for possible ideas.

1303Steve Scirocco Rare

8,650 posts · joined Aug 2002 ·

#1017794
This is what the late Beetle air cleaner looks like, a few bits of silicone hose and you connect into the base of it

landfall Officially Full-On Dubber

290 posts · joined Jun 2014 ·

#1017797
1303Steve wrote:some good reading http://www.clubvw.org.au/oldart017#fue02
Thanks, now I have something to work from.

Much appreciated and will be interesting to see if I can gain any success.

1303Steve Scirocco Rare

8,650 posts · joined Aug 2002 ·

#1019392
Thats a stock late model Beetle air cleaner