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Here's my next question. I have reverse flow inserts for my Doug's side pipes. I know, I know, they're restrictive. I think my aging ears will be grateful.
Anyways, I don't know which side is the front (exhaust input) and which is the rear (exhaust output).
Here's my next question. I have reverse flow inserts for my Doug's side pipes. I know, I know, they're restrictive. I think my aging ears will be grateful.
Anyways, I don't know which side is the front (exhaust input) and which is the rear (exhaust output).
So...pictures:
Which side is for the FRONT? Is it A or B ?
Thanks!
the inlet is A so that the exhaust gas can enter the small perforations and break up the sound. If you use B the exhaust just flows past the perforations.
Oh dang, I'm just coming back from the garage after spending an hour installing one of the mufflers using B as the inlet. Now I have two contradicting answers!
If I had to pick who is right, SFOcean or MelWff, I'm tempted to pick SFOcean for two reasons:
#1. I'm guessing it's called a reverse flow muffler because the gases have to travel backwards into the little holes.
#2. I can only slip the mufflers into the 4" pipe one way, and that is using A as the outlet. I would have to grind the perimeter of the B side to be able to slip it in all the way.
I checked mine on the car, they are installed with the punched holes facing forwards just as they would be in a standard glass pack installation.
Here are photos of the Hooker 21002HKR cut apart.
So SFOcean, to be clear, you're saying the opposite of your original post? Thanks!
Oh, I see that you edited your original answer and reversed it (no pun intended ). So at this point I think we have two consistent answers. And in order to make that work I would have to grind the perimeters of the B sides so they can slip in.
Oh, I see that you edited your original answer and reversed it (no pun intended ). So at this point I think we have two consistent answers. And in order to make that work I would have to grind the perimeters of the B sides so they can slip in.
I also see he reversed his original post to match mine. I'm using Classic Chambered inserts and they were clearly marked by the manufacturer as to inlet and outlet.
So SFOcean, to be clear, you're saying the opposite of your original post? Thanks!
Yes - and as for the restriction, my large cid BBC loses 150+ rear wheel HP on the dyno when all of the exhaust is flowing through the reverse flow mufflers. The exhaust is relatively quiet in this mode though.
Hate to admit it, but I wouldn't run those inserts on a 289 2bbl Mustang. At the inlet, talk about hitting a WALL before exhaust is forced into the little core tube. Terrible design. But quiet!
Yes - and as for the restriction, my large cid BBC loses 150+ rear wheel HP on the dyno when all of the exhaust is flowing through the reverse flow mufflers. The exhaust is relatively quiet in this mode though.
Wow, that is more loss than I expected!
Originally Posted by Chambered
Hate to admit it, but I wouldn't run those inserts on a 289 2bbl Mustang. At the inlet, talk about hitting a WALL before exhaust is forced into the little core tube. Terrible design. But quiet!
I am starting with the reverse flow mufflers and at some point later will probably experiment with louder/less restrictive ones. Those mufflers are pretty cheap compared to the thousands of $ I am putting into the car so to me it's worth trying out several options.
By the way I could not find a single video on the web with reverse flow side pipes - no sampling of the sound out there!
For future readers who may face my same original question: is "A" or "B" the inlet?
I did not undo the work I had done, I did not grind down the perimeter on the "B" side to make it fit as an outlet. Instead I mounted the second muffler just like I did with the first - that is with "B" as the inlet.
The reasons:
- I asked around on another car forum and was told B is the inlet.
- On Hooker Headers 21002HKR Hooker Super Competition Sidetube Slip-in Mufflers | Summit Racing, one customer asked "Are these mufflers directional?". And the given answer was: "They can only go in the tube one way. One end bigger than the other…"
So I assume that what I did is correct.
I have a set of 2.25 sweet thunder inserts with about 1400 miles on them im trying to get rid of... went to classic chambered myself and there is less drone. on both sets the inlet is tapered both inside and outside for less restrictive flow.
I have a set of 2.25 sweet thunder inserts with about 1400 miles on them im trying to get rid of... went to classic chambered myself and there is less drone. on both sets the inlet is tapered both inside and outside for less restrictive flow.
I have a set of 2.25 sweet thunder inserts with about 1400 miles on them im trying to get rid of... went to classic chambered myself and there is less drone. on both sets the inlet is tapered both inside and outside for less restrictive flow.
I also went to Classic Chambered, 33" Resonator, from the reverse flow and really woke up the engine. They were clearly labeled as far as flow direction and the openings of the perforations face the inlet of the side pipe.
I have a set of 2.25 sweet thunder inserts with about 1400 miles on them im trying to get rid of... went to classic chambered myself and there is less drone. on both sets the inlet is tapered both inside and outside for less restrictive flow.
just curious for the future, were the Sweet Thunders too loud?
just curious for the future, were the Sweet Thunders too loud?
Not "louder" per say just had a different pitch to the sound, on the highway at 3,000 plus rpm they had a drone to them which became annoying to me. To be fair every installations a bit different since the material the pipes are made of, cubic inches and the compression ratio all play into the sound a bit. I tried wrapping then in fiberglass harley sound deadener and such with no real effect.
Avoiding reverse reverse flow mufflers
). So at this point I think we have two consistent answers. And in order to make that work I would have to grind the perimeters of the B sides so they can slip in.
