gavinp Posted April 19, 2004 Share Posted April 19, 2004 Someone suggested this as a possible help with induction noise. Any ideas out there? Especially on a fire proof type material? thanks Superlight R #41 Link to comment Share on other sites More sharing options...
gavinp Posted April 19, 2004 Author Share Posted April 19, 2004 google found this (looks like I might be talking to myself 😬) http://www.woolies-trim.co.uk/felt.html g Superlight R #41 Link to comment Share on other sites More sharing options...
Jason Plato Posted April 19, 2004 Share Posted April 19, 2004 Thats what I told you the other day wasnt it - felt Link to comment Share on other sites More sharing options...
gavinp Posted April 19, 2004 Author Share Posted April 19, 2004 The acoustic foam was what I saw. Self adhesive + dampening sheet (stops vibration) + O grade sound deadening foam (whatever that means!) + foil (withstands 250C so OK for my engine bay!) + £35 for a large sheet (from another outfit called noise killers.) gonna give it a whirl Superlight R #41 Link to comment Share on other sites More sharing options...
Graham Sewell Posted April 19, 2004 Share Posted April 19, 2004 Rather than just heat resistant, look for petrol and flame resistant. Low tech luddite - xflow and proud! Link to comment Share on other sites More sharing options...
Glenn Wheeler Posted April 19, 2004 Share Posted April 19, 2004 Trying to get rid of the induction noise !!! Are you mad ? thats the best sound in the world when its in harmony with a screaming exhaust Link to comment Share on other sites More sharing options...
gavinp Posted April 19, 2004 Author Share Posted April 19, 2004 Glenn, funny I was just thinking that on the way home, having just ordered the material! I even considered, in a mad moment, having 2 bonnets - one with the acoustic foam on to get me through Bedford Autodrome and another for the more civilised and welcoming tracks like Snett. g Superlight R #41 Link to comment Share on other sites More sharing options...
Jason Plato Posted April 20, 2004 Share Posted April 20, 2004 I doubt the foam will be enough to get you through Bedford ☹️ You realy need an airbox . Lotus 7 Club Speed Champion 2003 South Wales Area Organiser C7 TOP Link to comment Share on other sites More sharing options...
PAUL MARRIOTT Posted April 20, 2004 Share Posted April 20, 2004 I spent a weekend tracing and resolving rattles and vibrations,, lots of tie wraps and bits of sticky backed foam with quite a bit of sheathing in old tubing to prevent metal to metal contact. The rear end from boot bases down was an especially noise area. Made a huge differance to the overall noise level and driving experiance. I can now hear the induction hammer and exhaust roar in all their glory and don't have to worry about premature failure due to vibration or chafing. Or you could just get Brooklands and hear nothing but the wind 😬 😬 Paul M. Link to comment Share on other sites More sharing options...
Rob Walker Posted April 20, 2004 Share Posted April 20, 2004 I ran with the inside of my bonnet lined with undercarpet felt, and I stress felt not that foam stuff. The felt is about 1" thick and positioned directly in front of the trumpets/airfilter. This significantly reduced the induction noise. No problems at Castle Combe but don`t think either Bedford or Goodwood would let me on. Edited by - Rob Walker on 20 Apr 2004 10:16:15 Link to comment Share on other sites More sharing options...
gavinp Posted April 20, 2004 Author Share Posted April 20, 2004 Rob Did you cover a large chunk of the inside bonnet area or just near the air filter? Really trying to avoid the ECU upgrade + vernier + Jenvey + air box £1500 upgrade route just to get through Bedford! gavin Superlight R #41 Link to comment Share on other sites More sharing options...
millsn Posted April 20, 2004 Share Posted April 20, 2004 Good chance the foam will not help you as it's best at dealing with frequencies above 1KHz i.e. high pitched stuff. The O grade is a fireresistance spec and is very high but the film on the front of it doesn't meet the same spec so I would be wary of that. The film also deteriorates the sound deadening qualities of the foam so best off all round without it. Additionally grade O if the black stuff is very heavy although there is some lighter stuff out there it is even less efficient at tdealing with low frequency noise but better at high. You need one of them airbox thingies Nigel Mills - 2.0 Zetec carbs soon to be EFi'd Link to comment Share on other sites More sharing options...
Jason Plato Posted April 21, 2004 Share Posted April 21, 2004 I think Rob is off line for a few days ........ He only covered a small section of the bonnet adjacent to the fliter . I realy dont think this will be enough for Bedford ☹️ , I dont think you will win this one at Bedford ☹️ Link to comment Share on other sites More sharing options...
gavinp Posted April 21, 2004 Author Share Posted April 21, 2004 now I am depressed! Superlight R #41 Link to comment Share on other sites More sharing options...
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