Pre-silencers - NoPistons -Mazda Rx7 & Rx8 Rotary Forum

1st Generation Specific 1979-1985 Discussion

Pre-silencers

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Old 01-28-2004, 01:28 AM
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Are there cheaper alternatives to the RB pre-silencers? For those that have the pre-silencers are there actually little holes internally along the length of piping? Are they packed with stainless steel or lava rock or something? I will probably buy a racing beat road race header but I'd like to fab the rest of my exhaust. It will be used on a peripheral port 12a so it has to quiet things down a good bit. I have some nice thick walled 3" diameter mild steel piping that I was thinking I could use to make pre-silencers...depending on their composition. Could I run a 2" pipe through the 3", pack it with something, and weld flanges around the end that fit over the 2" pipe and block off the 3"?



I'm just looking for ideas here.
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Old 01-28-2004, 10:34 AM
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yah the rb one is just like how you wanna make yours, i'm not sure what its packed with, something durable
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Old 01-28-2004, 01:14 PM
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buy a cherry bomb, gut it and pack it with steel packing and weld it back together. ceap presilincer...dude, i've read that post somwhere before. Rx-7club?
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Old 01-30-2004, 05:37 AM
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Yep, I've asked the question on both forums. The more feedback the better
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Old 01-30-2004, 12:14 PM
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The RB presilencer is filled with stainless steel wool. They look like donut shaped scouring pads. The stainless is of a very course strand.

I have made my own by cutting open a cherry bomb, removing the fiberglass sheet, stuffing it full of stainless steel wool, and then welding it back up. They work very well. Just requires flanges welded to it.



I can build you one for $75 + shipping.

I'll need to know your preferred tubing diameter and length.
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