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Improving the flow of a stock muffler
Adam_C - December 23rd, 2003 at 07:08 PM

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

modulus - December 23rd, 2003 at 07:58 PM

Quote:
Originally posted by Adam_C
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.

HRD 68B - December 23rd, 2003 at 11:13 PM

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

Craig Torrens - January 24th, 2004 at 11:03 PM

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

Alex Holzl - January 24th, 2004 at 11:08 PM

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

vw54 - January 25th, 2004 at 06:29 AM

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...

Adam_C - January 25th, 2004 at 10:02 AM

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)

68AutoBug - January 25th, 2004 at 10:27 AM

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

vw54 - January 25th, 2004 at 11:30 AM

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.