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| Exhaust size https://slantsix.org/forum/viewtopic.php?t=57681 |
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| Author: | 65Dodge100 [ Wed May 13, 2015 9:56 am ] |
| Post subject: | Exhaust size |
This used to be an old topic everyone was tired of talking about. I'v searched with do diligence and can't find what I need to know. In a stock engine, in a truck, I converted to 2 bbl and spent a lot of time getting a stock manifold right. Now I have to have the exhaust done because the angle of the pipe and manifold doesn't match. But I always wanted to make it larger anyway. Do I remember correctly - 2-1/4 from the manifold, then 2" out the back? Still working out a wreck. Found parts made of unobtainium - the best kind. Had them shipped from TX to GA. Now working to get them stripped, primed and talk a body shop into working on an old truck... They don't like that for some reason while restoring mustangs in their spare time. I have everything but a front bumper and a tailgate if anyone knows of of one. Thanks, Danny |
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| Author: | sandy in BC [ Wed May 13, 2015 12:09 pm ] |
| Post subject: | |
Go 2 1/4 all the way with a huge stock style muffler. |
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| Author: | SlantSixDan [ Wed May 13, 2015 12:44 pm ] |
| Post subject: | |
2¼" pipe, Walker number 50051 muffler, and appropriate tailpipe dumping out at the right rear corner of the truck, at between 30° and 90° horizontal angle and between 30° and 45° downward angle. That 50051 is a giant muffler — an OE replacement for '04-'05 year range Dodge Ram pickups. There's room under trucks and vans for a big muffler, and "big" is what you want for high flow with low noise/no drone on the highway. Amazon has a nice price on it, it's made out of stainless steel, it sounds good with a Slant-6, and it has a lifetime warranty that actually means something. |
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| Author: | Reed [ Wed May 13, 2015 1:47 pm ] |
| Post subject: | |
FYI- I ran one of those Walker mufflers on my brother's 225 powered 83 Dodge van until the catalytic converter melted down and clogged the muffler. It was VERY nice and quiet and had no highway drone, and highway drone is worst in a van. Dan's recommendations are right on the money. P.S. I actually still have the muffler and got all of the catalyst chunks out of it except for one small piece still rattling around. I want to reuse the muffler someday, but I will need to drill a hole in the case and hope the chunk of catalyst will fall out. Then I can weld the hole up and have a good muffler. |
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| Author: | kesteb [ Wed May 13, 2015 10:01 pm ] |
| Post subject: | |
When we had our Duster, we installed 2 1/2" pipe on the stock manifold and picked up 3/10s at the track. The engine was basically stock with an Autolite 2100 and recurved distributor. Second best modification we did on the car. |
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| Author: | 65Dodge100 [ Wed May 13, 2015 10:42 pm ] |
| Post subject: | |
I'm going to trust you guys on the muffler. Looks like a good one but Amazon says it doesn't fit my truck - no big deal, bought one anyway. My next question, Dan, you say it should exit the rear on the right. Mine exits on the left. Is That just to make room or best for sound or maybe mixed up with car exhaust or newer truck? Does it really matter? Is 2" an "appropriate" tail pipe? Just trying to make sure. 2-1/4 sounds good and 2-1/2 sounds good for cooling for a header pipe on a stock exhaust manifold but I don't want it to sound like a chainsaw or have a lot of back pressure either. I know this stuff has been tried all different ways. I'm not racing, I"m not hauling or towing - just want the best performance I can get while I'm buying exhaust and hopefully let the manifold flow enough to not crack. I know it needs some back pressure to clear moisture from the muffler but I also know too much will drive you nuts with blown gaskets. I don't think I'v ever had a truck with correct back pressure. Back woods duals on trucks meant for single and still too small. Drove me nuts for years until I figured out the problem. I've even made steel doughnut gaskets, then the manifold would blow. Just trying to avoid that and be certain I do it right Thanks a lot, Danny |
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| Author: | Nicademas [ Wed May 13, 2015 11:07 pm ] |
| Post subject: | |
Im running 2" pipes no mufflers with cifford headers. Loud pipes save lives..... but not ears. |
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| Author: | SlantSixDan [ Thu May 14, 2015 9:07 am ] |
| Post subject: | |
Quote: I'm going to trust you guys on the muffler. Looks like a good one but Amazon says it doesn't fit my truck
You're right to ignore Amazon's "helpful" warning. Their catalogue doesn't know anything about actual fit. It just knows what applications the manufacturer has listed the part for. Quote: My next question, Dan, you say it should exit the rear on the right. Mine exits on the left. Is That just to make room or best for sound or maybe mixed up with car exhaust or newer truck? Does it really matter?
It'll matter to you when you're stuck in traffic with the window rolled down and the air is still or there's a slight breeze blowing forward. You have a vehicle with uncontrolled emissions and dirty exhaust you probably don't want to be smelling. If it's easier to keep it on the left, though, then go for about a 45° rearward and 45° downward tailspout to minimize the conditions that would put you in the exhaust plume.Quote: Is 2" an "appropriate" tail pipe?
That would be plenty, but you can run 2¼" front to back with that muffler.Quote: hopefully let the manifold flow enough to not crack.
One doesn't influence the other.Quote: I know it needs some back pressure to clear moisture from the muffler
That's not true, either.
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| Author: | wjajr [ Thu May 14, 2015 12:35 pm ] |
| Post subject: | |
Copy Dan on reducing backpressure as much as possible. Some have experienced a most irritating drone at mid two thousand rpm at steady throttle. I'm of the afore said some except I have shorty headers, 2 inch duel pipes all the way back, and at the time a pair of burned out turbo mufflers. Larger pipe may increase drone. Drone and engine sound was so bad I would stuff hearing protection in my ears for any trip in excess of 20 minutes. The theory of running 2 1/4" pipe to muffler, and 2 " tail pipe from muffler to bumper is the reduced size of tail pipe helps to maintain exhaust gas velocity as it cools once passing through muffler. Also I have read that reduced diameter tail pipe may reduce tendency to drone. Your millage may very... To kill my drone problem I installed twin factory aftermarket mufflers, and between mufflers and engine a resonator that clipped all the buzzy highs a straight six tends to make when wound up resulting in a very quiet car. Search Aggressiveted for various exhaust and muffler combinations he has used over the years. |
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| Author: | 65Dodge100 [ Sat May 23, 2015 10:36 am ] |
| Post subject: | Thanks |
Thanks guys. I've tried every forum for Dodge, including the truck one, and you just can't get the help you can here. I'm going to use this HUGE muffler that just arrived, 2-1/4 to it and 2 out the back on the right side, correct side, passenger side in the US. I thunk it was right but with all the advice I know it will work okay. I'm a little scared of 2-1/4 out the back. Wouldn't it be too rumbly or loud? I'm not looking for anything loud. I think the muffler will take care of that but loud is a cop magnet around here. I'm a cop magnet already - just don't need any help. |
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| Author: | Serj22 [ Sat May 23, 2015 3:48 pm ] |
| Post subject: | |
Amazon's fit thing only sometimes works, and that's mostly for newer cars - and even then - it's off. For instance, you can actually buy a slant six on amazon, with Prime shipping, but it doesn't fit in any car... including mine. Any muffler can be made to hang in any system as long as it physically fits in the space provided. You should be golden. |
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| Author: | SlantSixDan [ Sat May 23, 2015 5:15 pm ] |
| Post subject: | Re: Thanks |
Quote: I'm going to use this HUGE muffler that just arrived, 2-1/4 to it and 2 out the back on the right side, correct side, passenger side in the US. I thunk it was right but with all the advice I know it will work okay.
Yup, that'll do nicely. Do be sure the tailspout doesn't dump out the rear -- ideally it'll be a 45° angle both downward and rearward, so it exits anglewise at the corner.Quote: I'm a little scared of 2-1/4 out the back. Wouldn't it be too rumbly or loud?
Probably not; this is a very effective muffler you bought. It will be quieter with a 2" tailpipe, though, which is plenty big enough and will still have less backpressure than the original stock system.
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