Improving the flow of a stock muffler

Adam_C Custom Title Time!

1,180 posts · joined May 2003 · 23 Dec 2003, 7:08 pm

#123279

i opened up a muffler today and i was playing, could i ream out the holes to a larger size (in the baffles) and possibly remove the crimper edges to improve the flow, so it ias not as restrictive, or should i just open up the crimps (im thinking cutting them off and tapering the pipe to get smaller as i have allready removed one

can ne1 offer me some tips?

photos are coming tomorrow

Adam
Adzslick@iprimus.com.au

modulus Veteran Volks Folk

2,009 posts · joined Jul 2003 · 23 Dec 2003, 7:58 pm

#123290

Adam_C wrote:can ne1 offer me some tips?

I think so...

Get a vacuum cleaner, some gaffer tape, various bits of tubing, some rulers, some coloured water etc. and make up a manometer to allow you to measure the pressure drop as the vacuum cleaner tries to suck air through the muffler. (OK, i'm summarising here, but you're setting up a flow bench).

Benchmark the standard muffler, then start the modifications, measuring after each one.

Chances are you'll be mighty surprised at what works and what doesn't. As some of the changes will be irreversible but negative, count on going through several mufflers to get an optimised result. Do what you can with putty and cardboard instead of cutting.

Good luck.

Peter Hill
1975 Type 2 Double Cab
modulus.com.au

HRD 68B Casual Dubber

42 posts · joined Oct 2003 · 23 Dec 2003, 11:13 pm

#123347

i would be interested in the results please post them after its all done
cheers brenton :thumb

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

8,040 posts · joined Jan 2003 · 24 Jan 2004, 11:03 pm

#132830

so did the vacuum cleaner get a workout, what was your finding ??

Alex Holzl 2332cc of pure BALLZ!!

1,550 posts · joined Jan 2004 · 24 Jan 2004, 11:08 pm

#132834

ive got a better way!!! chop it off!!! :thumb

vw54 Administrator Always Waiting 4 Friday

16,723 posts · joined Aug 2002 · 25 Jan 2004, 6:29 am

#132863

Adam if this is for the 1200 engine... Go see Lee at Volkshaven hes got some origional Sonic headers you just have to find a muffler.

Or if your just playing around then have fun i know one thing it will be louder...

I read it on FACEBOOK so it must be true

http://forums.aussieveedubbers.com/viewtopic.php?tid=91278&page=1#pid848630

http://forums.aussieveedubbers.com/viewtopic.php?tid=63561&page=1#pid624099

http://forums.aussieveedubbers.com/viewtopic.php?tid=4832&page=1#pid452603

http://forums.aussieveedubbers.com/viewtopic.php?tid=60650&page=1#pid574409

Adam_C Custom Title Time!

1,180 posts · joined May 2003 · 25 Jan 2004, 10:02 am

#132898

didnt setup the flow bench, but i am just plying around, gona break out the oxe and weld it up soon, then see how it goes..... if its louder and sounds better i miught just leve it on.

sonic headers dave?, what are these? are they worth my while and what kinda muffler do they use (Ie can i stick any modern muffler on there)

Adam
Adzslick@iprimus.com.au

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

11,654 posts · joined Aug 2002 · 25 Jan 2004, 10:27 am

#132902

Sonic extractors were the thing back in the late 60's & 70s... I had a set on one of My beetles.. they were locally made..
mufflers were very heavy duty.. never wore out.... and chrome plated...
and the muffler just clamps on, so any muffler with a similar inlet pipe size would do... l
Lee

- Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY---

vw54 Administrator Always Waiting 4 Friday

16,723 posts · joined Aug 2002 · 25 Jan 2004, 11:30 am

#132912

Yeah there good ive got one on my Orange Smoothie... it was S/H when i fitted it.

Yes you can fit a later type muffler to the headers.

I read it on FACEBOOK so it must be true

http://forums.aussieveedubbers.com/viewtopic.php?tid=91278&page=1#pid848630

http://forums.aussieveedubbers.com/viewtopic.php?tid=63561&page=1#pid624099

http://forums.aussieveedubbers.com/viewtopic.php?tid=4832&page=1#pid452603

http://forums.aussieveedubbers.com/viewtopic.php?tid=60650&page=1#pid574409