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OK so maybe I have too much free time and some basic fabrication tools.
I am adding side headers and pipes to my 68 427. (Dougs headers)
For inserts the quiet ones are way to restrictive and the non restrictive are too load...
So my idea is to fabricate my own, It is a simple glass pack design and should work.
I can use a 2.5 or 3" tube and run it almost the entire length of he pipe.
Having [also] spent a stupid amount of time experimenting with various exhaust variations, I'm afraid you will end up with the equivalent of " non restrictive are too load... " - with a probable buffering of some of the high note "raspiness" - as a result of the "packing".
I found I always need some type of baffling to calm the roar down and baffling is much trickier because of the impact on performance. There's much more to it!
Those are my thoughts, for whatever they're worth.
From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun.
Originally Posted by Tom_K
OK so maybe I have too much free time and some basic fabrication tools.
I am adding side headers and pipes to my 68 427. (Dougs headers)
For inserts the quiet ones are way to restrictive and the non restrictive are too load...
So my idea is to fabricate my own, It is a simple glass pack design and should work.
I can use a 2.5 or 3" tube and run it almost the entire length of he pipe.
Thoughts??
I encourage you to make your own. It's a great learning/fabricating experience (I fabricated the mufflers for both my Corvettes and my garden tractor).
Just an item for thought. You could also make a portion of the middle of your insert into an expansion chamber. That would probably help cut/quiet the noise volume pulses (at the 8&4 and 5&7 exhaust valve openings) that are part of life with Chevy engines.
I've had the same thought/idea about making my own muffler for sidepipes. My sticking point is the perforated tubing, can't find a good source for 2.5 or 3" 304 SS tubing. I can find flat material but would need a shop to roll it and then weld the seam. Anybody want to share their source?
If there is enough interest, I have a friend with a shop that specializes in laser tube cutting. I will try to get an idea of what he'd charge me to do a small batch of perfed tubes (say 3" x 36" 16g Stainless, $33 on Amazon) using 5mm and 10mm dia. holes and maybe a combo of those sizes.
Richard, I love the electric baffle idea (I've been torn between reasonable sound and minimal HP loss). The quiet Side Pipe Hookers kill power when you are moving enough air to support 560ish crank HP and the Hooker high flows are almost painful (I know,I'm getting soft). I will be using part of your idea on my Hooker Side Pipes (I needed one more Winter project )
Richard, I love the electric baffle idea (I've been torn between reasonable sound and minimal HP loss). The quiet Side Pipe Hookers kill power when you are moving enough air to support 560ish crank HP and the Hooker high flows are almost painful (I know,I'm getting soft). I will be using part of your idea on my Hooker Side Pipes (I needed one more Winter project )
Thanks!!!
I can stop them somewhere in-between. I should have my engine up and running again in the next few weeks- and hopefully will do what I want them to. I didn't save the receipts for all the stainless I bought..,As I don't want to know!!!
Originally Posted by metal tech
I've had the same thought/idea about making my own muffler for sidepipes. My sticking point is the perforated tubing, can't find a good source for 2.5 or 3" 304 SS tubing. I can find flat material but would need a shop to roll it and then weld the seam. Anybody want to share their source?
I looked all over- I did find several dealers across the pond in England for selling it. I ended up just getting some sheets- tacked one side to a piece of 4" tubing I had laying around. Put on some gloves - and was able to make it work.
Custom sidepipe glasspack Idea
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