Using the Stock Muffler

sander288 "Bolt-on Master"

1,404 posts · joined Aug 2008 · 30 Jul 2009, 7:23 pm

#726633

I've often wondered what are the limits of performance for the stock muffler, reason being is that reading about the Porsche Salzburg rally beetles they had the standard muffler as well as the southern cross rally cars of 1967.

What sought of things can be done to increase the performance of the standard muffler, and has anyone used one for a decent output motor, from specs on the aforementioned cars they put out about 100-125hp with the muffler, running either 32 or 35.5mm exhaust valves.

Cheers

Shaun

BMW R65 LS
1967 1300 Deluxe
Swing-axles FTW ❗

Joel Now containing 100\% E-Wang

9,368 posts · joined Feb 2006 · 30 Jul 2009, 7:29 pm

#726635

ive heard of people cutting them open and removing the perforated baffles then welding back together

why bother though? theyre still not eqaul lenght runners despite what some people reckon,
ive cut open my old german ernst one and it was same as the kadron ones inside

if its only for looks theres plenty of systems out there that flow better and use stock cutouts

i personally wouldnt run one on an engine with anything bigger than a stock solex
why make it breathe in better when its restricted breathing out

Craig Torrens 6 times Australian, 7 times State Hillclimb Class Champion

8,040 posts · joined Jan 2003 · 30 Jul 2009, 9:35 pm

#726666

yeah agree.........stock exhaust for a stock motor.

I know a stock exhaust on a 1916 makes it run like its a mild 1600 !

Peter_D_C Seriously Crusin Dubber

102 posts · joined Jun 2008 · 30 Jul 2009, 10:11 pm

#726673

Speaking of 1916's and stock exhausts Craig..... where is the love?!?!? 😁

1969 Type 3 Squareback

68AutoBug Beetle Restorer - Experience over 138\% - YIKES --

11,654 posts · joined Aug 2002 · 30 Jul 2009, 11:24 pm

#726689

sander288 wrote:I've often wondered what are the limits of performance for the stock muffler, reason being is that reading about the Porsche Salzburg rally beetles they had the standard muffler as well as the southern cross rally cars of 1967.

What sought of things can be done to increase the performance of the standard muffler, and has anyone used one for a decent output motor, from specs on the aforementioned cars they put out about 100-125hp with the muffler, running either 32 or 35.5mm exhaust valves.

Cheers

Shaun

its the very small tail pipes that restrict the exhaust...
You can but tapered pipes without the baffles...
I had two 48mm pipes welded to My muffler when it was new... was very noisy... a standard 1600 single port..

Lee

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13bwagon Officially Full-On Dubber

316 posts · joined Nov 2006 · 31 Jul 2009, 4:55 pm

#726761

yup have seen it done like 68 says
sounds good and flows better

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