[Mgs] Exhaust system

[Max Heim]

Barry, I think it does have something to do with mufflers and resonators — we were talking about the original factory sound levels. The factory did not use modern space-age soundproofing. Yes, of course you can make it much quieter using more insulation, but that is not what we were discussing. We were discussing what effect changes to the exhaust system had on the noise levels, all else being equal.

--
Max Heim
'66 MGB

> On Nov 28, 2017, at 9:08 AM, Barrie Robinson via Mgs <mgs at autox.team.net> wrote:
> 
> Hello Charley,
> 
> Nothing to do with mufflers, resonators, silencers or whatever.   I built an MGB GT V8 from the ground up and I was determined that it would be refined so I developed my own soundproofing material.   The result was fantastic.   My cabin is much quieter, my doors close with a clunk not a clang and one could hear the radio easily - if I had one !!!  I am now doing my next car and using BaryMat which has great specs (we will see what it is like when car is on the road !!!).   But do not use "popular" "well advertised" material such as Dynamat.
> 
> On 11/28/2017 11:04 AM, Charley & Peggy Robinson via Mgs wrote:
>> I'e been rethinking this.  First, I used the term "front muffler" in my earlier post.  Actually, it's not a muffler; it's a resonator. It's essentially an expansion chamber whose purpose is to cancel out the high frequency exhaust pulses; the serp barks IOW.  Some resonators have a shell within a shell with insulation in between to do some quieting; some don't. 
>> Since it appears that the exhaust sound you object to is localized in the cockpit area, I wonder if your resonator might be cracked or possibly touching the underside of the floor pan or a loose connection.  If not, increasing the resonator volume or its type of construction & insulation might be a way to go.  Just have to get the car on a lift and have a look-see. 
>> 
>> CR 
>> On 11/27/2017 6:40 PM, John Difede via Mgs wrote: 
>>> Thanks to all for your advice and comments.  I am reconsidering my idea to purchase a new exhaust system because I have no guarantee that it will be quieter than my current exhaust.   I am thinking of replacing my middle “bomb box” section with the oval shape muffler and see where I end up.  If need be I can then replace the rear section.  I am planning to use mild steel connected to the stainless front pipe. 
>>> 
>>> John DiFede 
>>> 1973 MGB 
>>> Sent from my iPhone 
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