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Sephiroth
Dodge Dakota
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5/19/2004
18:49:31
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 Subject: New Manifolds...
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Will the manifolds off a '92/'93 5.2L engine fit on my '95 5.2L engine with any problems? I ask because I am debating buying some and want to make sure they just bolt right up because I don't want to do any mods just to change manifolds. Also, woudl the Y-pipe be the same?
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j-mac
Dodge Dakota
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5/19/2004
21:37:54
|  RE: New Manifolds...
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seph,
If your going to go through all that trouble, why don't you just put on some performance headers? Money an issue?
If they fit, i cant imagine the flow/hp increase would outweigh the your pain and suffering (bloody knuckles, rust falling in your face, etc)
to justify the switch?
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Sephiroth
Dodge Dakota
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5/19/2004
21:48:13
| RE: New Manifolds...
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I thought they were larger manifolds, which is why I was looking to do it. I'll ask to verify, but if they are larger, would they fit my '95?
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wadak
GenI
5/19/2004
22:02:40
| RE: New Manifolds...
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The 92 and 93 v6 manifolds will bolt right up to newer trucks. I would think that the 92 5.2 manifolds would bolt right to newer trucks. Two advantages of the manifolds over headers, less heat under the hood and quieter than headers. Also in the long run the manifolds will outlast headers unless they are of the ceramic coated variety.
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92dak
Dodge Dakota
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5/20/2004
11:12:58
| RE: New Manifolds...
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manifold part #'s 53006618 and 19 will bolt up to your truck. they have larger running ports(better flow) most likely 10 hp. and the two advantages Wadak mentions.
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Sephiroth
Dodge Dakota
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5/20/2004
11:56:45
| RE: New Manifolds...
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w00t! Looks like I blow some money soon!!
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doubtfull
Dodge Dakota
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5/20/2004
17:05:14
| RE: New Manifolds...
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I don't think you'd see 10hp from those mans. The newer ones may look restrictive but this isn't the case. I've had mine extrude honed and the shop keeps track of before/after flow #'s of each manifold they do. The tech said they were within 3% of the older style manifolds, (this will not translate into a 3% HP gain). In the end, it's your money, do what you like.
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gen1dak
Dodge Dakota
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5/20/2004
20:30:50
| RE: New Manifolds...
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It's been generally accepted since the mid '93 phase-in of the smaller units(inside diameter), that the first Magnum exhausts were good for at least 10hp over later ones. They had a matching y-pipe, so be sure to get that too so it'll all match up. The first ones were 2 1/8 inch inside diameter, later units are 1 7/8 inches.
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Sephiroth
Dodge Dakota
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5/20/2004
22:25:24
| RE: New Manifolds...
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So my current '95 Y would not bolt right up?
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gen1dak
Dodge Dakota
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5/20/2004
22:52:06
| RE: New Manifolds...
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The flanges fit, but there'd be 1/2 inch diameter mismatch on the inside, and that'd pretty well defeat the gains of the better exhaust manifolds.
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00R/T CC
Dodge Dakota
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5/22/2004
15:04:51
| RE: New Manifolds...
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Bigger=better, not allways.
Significant improvements in flow have been gained through the years and progression of the magnum series of engines. Engineering updates on the late (post '93) exh mans INCREASE port velocity, scavenging and therefore efficiency equaling more HP. (I have seen 6% increase in milage after having my mans. extrude honed, not sure about HP as I haven't had it on the dyno since.)
Take a look inside a late model man and compare to the 'log' of old. It is evident that a lot of time and thought went into that design.
This is part of why relative minimal gains are seen from swapping to headers. But hey, were all here to hop up by whatever means possible.
my $0.02
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00R/T CC
Dodge Dakota
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5/22/2004
15:05:31
| RE: New Manifolds...
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corr.: "mileage"
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gen1dak
Dodge Dakota
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5/23/2004
00:10:18
| RE: New Manifolds...
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What exactly do you think Extrude Honing does? Also, it seems you think we are talking about pre-Magnum manifolds vs Magnums. We are not. What we are talking about are the 1st generation of Magnums which were used in 1992 through about mid-year 1993. Externally, they appear identical to all other Magnum manifolds that have been produced since then, but internally, they flow better because of their larger internal diameters relative to their overall design. The same internal contours do not flow as well on later Magnums since they are smaller internally. The original Magnum manifolds actually outflowed any available header of the time when they debuted. The header guys had to gear up to catch up, but have managed to choke out a few more horses, but the gains are not as dramatic as compared to pre-Magnum exhausts. By extude honing, you clean up the flow, and, depending on your requests, enlarge the inside diameter of the port a little or a lot.
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00R/T CC
Dodge Dakota
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5/23/2004
11:53:11
| RE: New Manifolds...
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gen1dak, A#1;Most aware of extrude hone process. Probably more so than anyone here. When mine were done, vitualy unchanged internal dia., as I retain the stock y-pipe.
A#2;Read my last post re:"post '93".
Which Magnums make more power?
I've already stated more flow is better. I was surprised by how much better my mans. flowed, as not much material was removed. Mileage, belive it or not, (13.7 vs. 14.5mpg) imprvd., due in part to the finnish, indicated by improved flow resulting in better mileage and probably a bit more pwr. No other mods last year to this.
Go old school! I'm not stopping you, or Sephiroth, I still belive you will not see 10hp on a '95 318 from swapping mans, that's all.
gen1dak, it was also generally accepted that Sadam had the weapons, too. Challenge conceptions.
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gen1dak
Dodge Dakota
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5/23/2004
14:41:21
| RE: New Manifolds...
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Okay, you did mention the older "log" exhausts in a comparison to the Magnums. Also, no "improvements" have been made to the Magnum exhausts. Ongoing engineering? My ass. Push the same air volume through a smaller opening and it will have to move at a higher velocity to do this. Since the exhaust is primarily moved by positive displacement of the piston action, this actually places a very slight increased burden on the engine...that means lost power right there. Less efficient scavenging occurs since the backpressure is increased (this is all relative within a given example). Cleaner flow makes for higher velocities within a given volume. Yeah, I think we all get that. The point is, he's not asking if extrudehoning will help. He's asking if the 1st edition will flow better. They do. Period. Why do you think the post 93's are so doggy by comparison? Lazier cams and tighter exhaust. Also, are you saying that such a swap is old school, and by comparison, exturdehoning is new school? Hey, porting has been around for almost as long as engines themselves. Smokey Yunick used dry sand drawn through head ports to do the same thing in the 60's. And, extrude honing has been around for what, around 10-15 years now? Not exactly a new concept. Now, if the muffler is a choker, better manifolds won't be a huge help. Open the muffler up and he may see 15hp.
As for Hussein, his WMD cache isn't in a bunker somewhere, it's the masses of ignorant pacifists everywhere.
Question concepts? Not until you have the facts to back it up.
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00R/T CC
Dodge Dakota
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5/24/2004
17:07:46
| RE: New Manifolds...
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"Push the same volume" right, but you also contirdict your 'point' by having acknowledged scavenging. You have no idea about boundry layer flow, laminar flow, port velocity or scavenging for that matter. Do some reading and get back to me. Do you actualy think an increase in volume in the exh man will result in commensurate increased velocity? Why not run headers with the biggest pimary tubes possible? Bigger is better, right? I doubt that you've had both mans side by side, to compare visualy let along compare the flow #s. Yes, the muff. is going to a choke, the cat and the bends, too. My point was to get him to extrude his mans., either, I could care less which ones he uses. Extrude may not be new, didn't claim it was, but it's newer than hand porting for certain.
I don't expect you to explore alternate possiblities, it's obvious that it isn't in your nature. Don't 'question' a thing, see how far you get thinking like that. Besides, I actualy stated "challenge", but you knew that, right?
As for the personal comments, keep them to youself, no one here cares for that, it certainly doesn't bother me. Besides, it says more about you, and your lack of education and thin skinned nature common to your type, when you post your narrow, ignorant and naive comments.
Validate yourself, then post the results here. I know that facts, do you?
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00R/T CC
Dodge Dakota
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5/24/2004
17:47:17
| RE: New Manifolds...
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Sorry, not to confuse you (easy, I'm sure), miss-type on my part, to clairify: Point was NOT to get him to extrude. (though he may consider it)
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gen1dak
Dodge Dakota
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5/24/2004
18:26:24
| RE: New Manifolds...
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Yeah. What----ever........
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00R/T CC
Dodge Dakota
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5/24/2004
18:34:54
| RE: New Manifolds...
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Exactly the kind of reply I'd expected.
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gen1dak
Dodge Dakota
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5/24/2004
20:26:15
| RE: New Manifolds...
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I answered Sephiroth's question, plain and simple. Anything you were expecting, I really could not care less about.
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don
Dodge Dakota
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5/25/2004
02:24:46
|  RE: New Manifolds...
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hey, good points and some bad...i'd pay $5 to see you guy's punch it out! those manifolds are still for SALE... i believe those manifolds with newer free flowing cat/s and less restrictive muff. and pipes could only help in the operation of exhaust out...a new/larger y-pipe would perform as good as some bad headers...with a larger TB and some cool air, you are now feeding the in side. HP.101
i don't have a track or dyno or any much thing to measure, flow , that would be cool to test. bottom line is you get more and more out of the motor at any rpm is good. is it $ feasible, i think so
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