Can anyone tell me if this manifold is in good shape or not? if you need different pics to verify let me know i can snap them. I have an '88 SE. Also are there gaskets that i need cause I want to swap this one for the one that's on my motor. The reason being is my front Aux port is stuck closed. and the Aux shafts on the other manifold seem to move freely. Any help would be greatly appreciated. Thank you.[IMG][/IMG][IMG][/IMG][IMG][/IMG][IMG][/IMG]

 

Yea, it should be good. As long as there aren't any cracks or holes or something like that. Just clean it up a little bit first. Also, test the actuators first. Place your fingers over both vacuum ports. Depress the plunger. Is there resistance? Take your fingers off the holes. Depress the plunger. Now cover the holes back up with the plunger in. Does the plunger stay down when you let go of it? Then it's good.



Another good thing to do while it is out would be to clean the actual port sleeves. Grab the pin on the sleeves with some pliers and pull them out. Clean them with some oven cleaner if you have it, or some brake cleaner... Either will work. Do not lubricate them! I've been told by other members that it will just attract dirt and grime, and make them more prone to freezing up. There is a certain way they need to go back in, I'll try to dig that up somewhere, or you can search for it.

As for the gaskets, mazdatrix sells them. Here is the page they are on. You will need:

1.) 13-111A-N326 x1
2.) 13-112A-N326 x1
3.) 13-171A-N225 x2 (The pic shows two, so I don't know if they are sold as such or individually. But ideally you need two of these.

Depending on if you removed the plenum from the upper intake you will need:

4.) 13-135A-N326 x1


Make sure to scrape all the old gasket off. This is a very high-risk area for vacuum leaks, might as well prevent them before they happen, because it won't be this easy until the next time you rip apart the top end.

 

The manifold looks fine. Dirty, but fine.

 

Thanks so much i really aprreciate it. You guys are life savers! and ya the ports did exactly what you said they should do!

 

yea, looks good.

and yes, you're going to need new gaskets...for that alone you'd need the lim->motor gasket and the uim->lim gasket

make sure you clean off the old gasket too

 

If you want to, you can also get a set of pineapple 5/6th port inserts.
HP is minimal (havent seen an actualy dyno test) but its suppose to breath better at top end because of the slope, instead of hitting a flat wall at the end of the port tube.

 

Inserts? Better power band?

 

http://www.pineappleracing.com/index...PROD&ProdID=11 Im taking all that apart eventually to get my front port working, im gonna get a set of these too, along with a few other things while its all apart.

 

I was going to suggest that too, but that's getting a little more in depth than just your basic teardown. I've always wanted to do this as well. The price is right too.

 

Yeah but what the heck, if your gonna take everything apart might as well do what you can while your in there, Im waiting to get a set of those before i take it all apart.

 

Do you think i should port the manifold while its out? what are the pros and cons of porting?

 

pro: experience, other than that i think it's like <1hp. I would port it just for the sake of having everything near perfect for the flow, making sure you're getting much air as possible down the intake path.

con: uhhh...none? just don't go expecting huge gains from something that already flows pretty well

 

If you are going to "port" your intake manifold, make sure it all runs smoothly. You don't want to create a lot of turbulence in the manifold, that will kill your power.

I have seen some people that port match their manifolds, but make them wider where they connect, this just caused uneven flow as soon as it hit this wider region, then went back down to the smaller region. Most of the time, the stock setup is best.

Just be careful with turbulence, that would be a con of doing it. Killing some top end power because of turbulence at high engine speeds. If you do port match, and make the openings bigger, you will need to find a way to make the whole thing bigger / same diameter all the way through.

Which is hard to do in the middle of the manifold.

 

Ya i dont think im gonna do it. Also i hear we need back pressure for the aux ports to work. Is this true?

 

[QUOTE=adubspyder;8447888]Can anyone tell me if this manifold is in good shape or not? if you need different pics to verify let me know i can snap them. I have an '88 SE. Also are there gaskets that i need cause I want to swap this one for the one that's on my motor. [QUOTE]

Gaskets? Nah, you don't need 'em. Gaskets are a myth.

 

Wow *** thanks for coming into the thread just so you could get your posts up to read people's sigs...

 

89 N/A's use the air pump to open the aux ports, so you can run a free flowing exhaust if you want. just keep the pump on there.

I am almost 100% sure about this.

 

So its ok to run free flow on an 88?

 

On an 88, which is an s4, you need a certain amount of backpressure from you exhaust to open the ports, there is a good right up in the archives on how to make it run off you airpump, so you can use whatever exhaust you want, any cars after 88 already run of the air pump though.