Don:
First of all, let me say that I regard David Vizard as the god
(little "g") of engine building. Having read books by Ligenfelter,
Yunick, and others, I can say with complete confidence that Vizard is
the only one offering detailed data on how to make power. No one else
wants to give away any secrets, and so their books are very superficial
compared to Vizard. No one except Vizard talks about why it is important
to deck the block, or gives such detailed knowledge of head porting, cam
selection, etc.
If Vizard says these mufflers are good, then believe him. Size
the muffler according to his guidelines, and it will work. I have only
limited experience with Flowmasters, and while they apparently flow very
well, I have been disappointed with the build quality and feel that they
are much too loud, which is the point of installing a muffler. Racers
love them, however.
I have used Dynomax mufflers, and they have been very nice. Nice
tone, reasonably priced, with a good balance between noise and
performance. I don't think you will be disappointed. As for it sounding
like a Triumph, well it is going to sound different, but that lovely
long stroke, in line six sound is still going to be there. It will
probably have more of an edge to it, however.
Vance
-----Original Message-----
From: owner-6pack@autox.team.net [mailto:owner-6pack@autox.team.net] On
Behalf Of Don Malling
Sent: June 12, 2005 7:01 AM
To: 6-Pack; triumphs@autox.team.net
Subject: David Vizard and mufflers
I found this article on mufflers by David Vizard
http://popularhotrodding.com/enginemasters/articles/hardcore/0505em_exh/
index.html
In it he states that you need 2.2 cfm per hp to achieve free flow in
your muffler (no back pressure
-- same as open pipe).
For our cars at 150 hp this would mean a muffler cfm flow of 330 or so.
He mentions Flowmaster, Dynomax, and Magaflow mufflers. Only Dynomax
seems to mention their cfm flow
and even for their more restrictive models (SuperTurbo at 410 cfm) it
seems to be more than adequate
for 150 hp. So it would seem to me that any of these mufflers would work
well.
http://www.dynomax.com/superturbo.stm
Has anyone had any experience with these mufflers and which ones sound
most like a Triumph. I
understand Flowmaster has a distinctive sound, but have never heard one
in person.
I am inclinded toward the Dynomax SuperTurbo.
Don Malling
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