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Thread: kishy's 1984 Town Car

  1. #61
    BANNED! sxcpotatoes's Avatar
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    You can check out my vid in the exhaust sound thread for an example of headers, 2.5" custom H pipe, and no mufflers at all. It was okay at idle and cruising, but if you got on it then it was almost impossible to have a cell phone conversation inside the car (probably worse outside). Eventually had to put some mufflers on because I got on it going through the tunnel on the way to work one night and the cop pulled me over.
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  2. #62
    formerly blkpnthr
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    Found the vid. Yours was way more obnoxious than I'd ever want mine to be.

    Cats do a massive amount of noise reduction, comparing "no cats and no mufflers" to "cats with no mufflers" is apples to oranges.

    Also keep in mind this is a stock CFI engine with the heads people often decry as "awful". They don't move a lot of air.

    In any event the plan is to have it set up so mufflers can easily be introduced. Nothing is getting welded or U-clamped, only band clamps.
    Last edited by kishy; 02-12-2018 at 02:15 PM.

    83 GM 2dr | 84 TC POTM 1/2017 (Pre-Op) | 85 CS | 85 Ranger | 91 GM POTM 12/2017 | Junkyards

  3. #63
    Wagon Addicted Tiggie's Avatar
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    I agree - the stock cats and no mufflers sounds pretty good, at least in my garage. Not sure if they’d sound different under load. My glasspacks sound good in the garage but like butt on the road.

    I too suspect the magnaflows could be louder. With the baby cams these cars run, I still doubt noise would be an issue. You could always add mufflers later.

    Have you compared the length of the 84 manifold to the 91? If they are the same, you should be able to run then lincoln logs, even with the heat riser and new cats.
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  4. #64
    Play me something funky! marquisman's Avatar
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    I ran cats without mufflers on my wagon for over a year. I liked the sound, not obnoxiously loud and low resonance inside. Only think I hated, the deceleration popping in the exhaust, like when going down a hill. Honestly, sounds like shit. I was able to fix this issue and keep the nice rumble, with a pair of cherry bomb extreme single chamber mufflers.

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  5. #65
    formerly blkpnthr
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    I concluded that there was no off-the-shelf "S" pipe to meet the needs of my muffler bypass using direct fit H and tails, so I opted for Summit welded turbo mufflers plus short lengths of ID to OD pipe connectors to make up the length difference, which are the cheapest to-my-door option for a "non-stock-replacement" muffler. I have no interest of any kind in putting it in a shop to get stuff measured, custom formed and done...if I can't do it myself on jack stands with band clamps, I don't want it on the car.

    We shall see how they sound...hopefully they work out alright.

    Dual 2" stock stuff with ugly bends will still be a big flow improvement over the single, and I'm thinking the new cats may wake up a few ponies too, depending on exactly how much exhaust is able to sneak through the current ones.

    Most likely I'm leaving the manifolds alone, there doesn't seem to be a compelling reason to change those (if there is, sell me on it please).
    Last edited by kishy; 02-16-2018 at 04:32 PM.

    83 GM 2dr | 84 TC POTM 1/2017 (Pre-Op) | 85 CS | 85 Ranger | 91 GM POTM 12/2017 | Junkyards

  6. #66
    Approaching 2 decades of DDing Box Panthers VicCrownVic's Avatar
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    Quote Originally Posted by kishy View Post
    ...
    Most likely I'm leaving the manifolds alone, there doesn't seem to be a compelling reason to change those (if there is, sell me on it please).
    When I swapped the engine in The Ice Car a couple of summers ago i replaced the cats and everything from that point back. Rusted to crap studs in the manifolds that were holding the cats to the manifolds weren't coming out (with the tools available, dad's torch set was in need of gas) even with the engine on a stand. Dad took the manifolds to work with him and had the studs and O2 sensors out with ease. The bolts holding the manifolds to the engine were super easy to get out though. If extracting the studs and/or O2 sensor(s?, there's only one on cfi, right? not sure where) is a concern for you and doing so would be easier on a bench, that might be enough of an excuse to at least find some Lincoln logs.
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  7. #67
    formerly blkpnthr
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    Well, I have a set, but I figure it would make more sense to put them on an engine that has heads with flow capability that justifies better manifolds...supposedly 84 has boat anchor heads still.

    I did think of the probability that the cat flange bolts may not decide to come undone, so it's in the back of my mind. Since the best I have for heat is a propane torch, if they're truly stuck in there, I don't know how well I could wrestle them out myself in that case.

    Current plan is to do the Lincoln exhaust before I switch back from the Ranger to the Lincoln as DD. Lincoln needs to be 100% ready to hit the road by May, so that sets up a timeline. Assuming I try to pull the cat pipes off the manifolds fairly soon, that timeline will be a cakewalk to meet.

    83 GM 2dr | 84 TC POTM 1/2017 (Pre-Op) | 85 CS | 85 Ranger | 91 GM POTM 12/2017 | Junkyards

  8. #68
    I'm an air-conditioned gypsy gadget73's Avatar
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    The stock iron logs flow pretty badly. There is a weight advantage but lets be honest, in a 2 ton car who gives a rat's ass about a few lbs?

    but yeah, engine side usually comes out fine, the studs to the downpipes not so much.

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