I’ve
wondered about the suitability of the Racing Beat presilencers. I don’t think it’s
SS wool but wider strips of SS they use to fill it. That’s the first thing the exhaust sees
after the header and I know they hold up.
This is everyday car driving, too.
Lynn, do these things hold up at all in race duty cycles?
The case is ¼” mild
steel, I believe, so there would be a weight penalty off the shelf. Maybe these innards and a SS can.
Todd Archer
The
problem with fillers, or packing if you like is
twofold. The usual glass like material used in piston engine mufflers, just
melts. If you catch it quickly, you may get to see the glass balls before they
are machined away and vanish.
If you
try a ceramic blanket material like I did, you discover that the hammering of
the exhaust pulses mechanically decomposes that material, or any material into
fuzz and blows it out.
The
race car muffler has small tubes with thousands of small perforations. A
4" perforated tube down through the center, with 5 additional smaller
perf tubes inside of that tube. Still under 100 dB at 50 feet after 7 years of
service. It looks like the Burns mufflers but is very much larger and is about
27 pounds. The Burns mufflers look like the way to go to me. They offer
stainless swarf packings which might hold up for quite a while.
Years
ago, there were mufflers (very big and heavy) used in Mazda race cars that had
Lava Rock fillings. There was a bung with a screw in plug so you could refill
the lava rock after each race. The Mazda just turns it into dust with the
hammering.