Intake Manifold Modifications.....

[flat_black]

DSM: 1997 is when the head and intake manifolds were updated. The Probe may not have ever received the update IM, but received the updated head. The 626 2.0L from 1997 on all have VTCS and VICS, I beleive, but don't quote me on this for sure.

Any Protege from 2001 and on equipped with the 2L engine will have it, too. Obviously, if the 2001 with the 2.0L happened to be an MP3, then it wouldn't have VTCS. =)

MSP Chris: There are two set of butterflies, both in the upper portion. =) One is at the very outlet of the intake manifold (VTCS), just before it meets the head. The other is between the two halves of the manifold, top and bottom (VICS).

Don't touch the VICS, just the VTCS, the ones that are at the very outlet of the manifold.

 

[mp5jeff]

for those of you that are too lazy or dont have the tools it should run you around $80ish to have a machine shop do it...well that would also inclue the IM being boiled if it was dirty

really, which machine shops?

 

[mp5jeff]

from what i've heard, it would cost alot more then that(what people who have their engines at machine shops now tell me), but ill call a few tomorrow and let you guys know the quotes.

 

[CustomMSP]

Sounds like a good project. Prolly gonna try it.

 

[Focus]

Are you guys that are doing this port matching and the head side? One thing to make a better passageway, anothe to increase the size. If you don't match it on the head your air is going to be hitting a wall.

 

[flat_black]

Yep! Lack of laminar flow sucks. =) But I have yet to order another head that I'm gonna be porting out. Since I want power all around, though, I'm not going to be bumping the cfm capabilities of the head so much as making flow smoother. Opening up the inlet and tapering it will allow for a nice venturi effect and increase intake velocity and smooth out the intake charge quite a bit.

So, unless you plan on working the head, you may as well not port it out very much, just enough to match the head, and smooth out the flow. *nods*

 

[mp5jeff]

im porting my head, not sure about you guys! lol =), just want it to match the intake mani ports

 

[thewrench]

flat- can you verify this? Aren't the ports in the head actually larger than the gasket? I had seen another port matching thread a while back and that seemed to be the case.

OH btw, so I suppose that im's doing ok for you, lol.

 

[mp5jeff]

ill take a look tonight when i go home, the head is sitting in my garage, ill let you know,

 

[thewrench]

Thanks. I saw something of a how-to on installing the spacers a long time ago and it seemed that the ports were larger than the gasket holes, or at least the intake ports. So that you could use the spacer to smooth the flow between them without having to work the head. It'd be nice to know how it matches up.

 

[flat_black]

I beleive the intake side of the head's ports are larger than the intake manifold, but I don't think it was bigger than the gasket itself, but I can't quite remember... But I guess we'll know at some point tonight. =)

And yes, the manifold is working great. The porting was too light for me, though, so I had to open it up more. =) Hehee.

 

[DSMConvert]

$80 is what I paid a little over a year ago for RRE out of CA to do my dsm manny. Had the intake ports matched on my 455 pontiac motor for 200 including a boil dip to clean out the crap and that was for 2 manifolds(V-8 for those who didnt catch on). Depending how busy we are I could probably get the porting done at my partners porsche shop in Orlando for right under $100, but taht depends on how busy they are and how many of you guys wanted to have it done...

 

[Focus]

I beleive the intake side of the head's ports are larger than the intake manifold, but I don't think it was bigger than the gasket itself, but I can't quite remember... But I guess we'll know at some point tonight. =)

And yes, the manifold is working great. The porting was too light for me, though, so I had to open it up more. =) Hehee.

Yes the head's ports are bigger than the intake, and that is because you don't want any restriction. I know this, because I just saw my head on the flow bench. I am post and polishing the head, 3 angle valve job, reshape the combustion chamber, etc...

So gasket matching the ports on the intake only will improve flow through the intake manifold, but the flow is hitting a wall when you get to the head.

 

[Focus]

Pics

Here are some pics, you will notice, the imprint of the gasket on the head and my instake gasket matched. ( Head hasn't been finished yet)

Notice what I mean by the airflow hitting a wall.

 

[thewrench]

If you don't want to grind on the head, though, the best you can do is to match the intake port to the head port. Make a template that exactly matches the head out of heavy card stock, and then use that to open up the intake manifold. Or in the how-to I saw, the person matched one side of a phenolic spacer to the head, and the other side to the intake mani and then smoothed out the difference on the spacer. That way he smoothed the flow without having to grind on any metal.

 

[thewrench]

Eddie- I found this post of yours from way back. Are you still using gaskets or just sealant. I'm thinking the sealant might smooth the flow just that little bit more.

http://www.msprotege.com/forum/showpost.php?p=422843&postcount=36

 

[flat_black]

I ditched the gaskets; The intake manifold and head sit flush, now. I so want a head to work on now. Anyone have one for really cheap? =)

 

[Installshield 2]

Here are some pics, you will notice, the imprint of the gasket on the head and my instake gasket matched. ( Head hasn't been finished yet)

Notice what I mean by the airflow hitting a wall.

haha, nice to see you have a clean working environment dude...(thumb)

 

[Focus]

Ha Ha, and that is actually cleaner than usual.

haha, nice to see you have a clean working environment dude...(thumb)

 

[TurfBurn]

I ditched the gaskets; The intake manifold and head sit flush, now. I so want a head to work on now. Anyone have one for really cheap? =)

I may be able to help you out there.. I have an extra head laying around... has two bent valves, and one or two more that are a bit cooked, but the head itself appears to be fine by all measures. I'd be happy to part with it for a reasonable price if you want.

let me know!

Steve