Benefits of Port and Polishing the Intake Manifold - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
 
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post #1 of 8 (permalink) Old 03-15-2011, 10:30 AM Thread Starter
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Benefits of Port and Polishing the Intake Manifold

So I was speaking with a mechanic friend of mine after a whole slew of problems with getting my intake cleaned out and I mentioned that I was hoping to be able to port and polish (with a dremel not a machine shop) and he told me that the intakes on our engines are overkill to begin with and there wouldn't be any real gain. With the looming threat (albeit a small one hopefully) of killing my lower intake, and from the sounds of it the small possibility of gain, is it really worth it? I mean I was also going to powder coat it and my valve covers, which would be an added bonus, but I don't know if its all worth it in the end on my 135k trep..... So what do you all think about that whole train of thought?
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post #2 of 8 (permalink) Old 03-15-2011, 07:14 PM
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I would say that its worth it if you are doing lots of other modifications. On a mostly stock engine that probably isn't the best place to start.

With that said, I did mine, but I have some extreme patience for tasks like that.
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post #3 of 8 (permalink) Old 03-15-2011, 09:01 PM Thread Starter
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HA HA, yeah I like doing mundane things like that though, but not if they have no point lol Really im more about getting them all good and cleaned out as they are totally full of crap, I just didnt have the ass left to pull my lower intake after I cleaned out my throttle body over the weekend.... Did you see any difference in yours when you cleaned out all the castings??? I dont care if it just quiets it down or adds a single horsepower, just looking for something to do, but it has to make SOME difference lmao I gotta find a cold air intake off the boards or something, I need a new mod, im starting to twitch....
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post #4 of 8 (permalink) Old 03-15-2011, 09:01 PM Thread Starter
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Oh and by chance did you take pictures when you did it??
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post #5 of 8 (permalink) Old 03-16-2011, 02:50 AM
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Quote:
Originally Posted by Strvinmarv View Post
Oh and by chance did you take pictures when you did it??
I take a million pictures of every project. I'll try to dig up my thread on it.
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post #6 of 8 (permalink) Old 03-16-2011, 02:58 AM
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Here you go, the whole shibang.

https://www.dodgeintrepid.net/showthread.php?t=176230

That is the most extensively modified intake on a second gen LH out there. "Ported" upper plenum, spacer, and lower intake manifold. All three pieces port matched.

The last piece on the engine intake is the heads, then I'll extend the intake to be ram air and I'm done on the intake side.
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post #7 of 8 (permalink) Old 03-16-2011, 10:32 AM
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i think the best place to start would be the exhaust. dodge purposely made the exhaust ports small to "reduce heat transfer to the heads"(i don't agree with the benefits tradeoff). that with the small manifolds make for a fairly restrictive exhaust.
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post #8 of 8 (permalink) Old 03-16-2011, 01:55 PM
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I only polished mine. When I pulled the manifold from my old 3.2L it was dirty as heck. Polished it to clean it really since it would easier. I haven't felt any gain from it although I never had a chance to test it since the new engine was a 3.5L with a slew of upgrades.
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