[Mgs] MGB exhaust system.
paulhunt73 at virginmedia.com
Tue Nov 28 06:16:25 MST 2017
On a chrome bumper the tail pipe is straight so you should be able shove a
broom-handle through the rear box (or not) to see.
I suspect there are many variations. I vaguely recall reading one box may
have been baffled to reduce one type of noise by slowing down and smoothing
out the pulses, and the other straight-through with perforated pipe to
reduce high-frequencies. Since partially crushing my middle box
significantly improved the sound, I rather think that is baffled, the rear
is definitely straight-through. That's not an 'original' though (how many
are today?) but an SS 'direct' replacement.
The baffled box generates some back-pressure which performance boys don't
like, so go for straight through, but I suspect that is a case of 'Never
mind the effect on bhp, listen to the noise'. Go too far in reducing
back-pressure/increasing flow and engine performance drops off.
----- Original Message -----
> Does anyone know how the original mufflers were constructed. Were they
> internally baffled or were they a fiberglass packed flow through design?
> It seems all of the information I can find indicates they were of the flow
> through design.
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