Intake Manifold porting question

[Wilfus65gs]

I have a guy who will do just about any machining work that i want him to do for free. I asked him about doing my intake manifold and he said something about matching the size of the intake manifold to the header. I was wondering if i should go ahead and get an aftermarket header before doing this so i wont have to change it later.

 

[miamieclipse]

umm WHAT!???? bro go look at ure engine bay, ure header (if stock) is the thing closest to ure fans, its prolly behind a heat shield. Ok no look towards the bak of ure engine bay n ure gonna see ure intake manifold, so i dont kno where ure friends is talkin about

 

[Eclipsed]

I have a guy who will do just about any machining work that i want him to do for free. I asked him about doing my intake manifold and he said something about matching the size of the intake manifold to the header. I was wondering if i should go ahead and get an aftermarket header before doing this so i wont have to change it later.

Im pretty sure he meant that you'll have to match your intake manifold to the HEAD, not the headers. The head is what the intake manifold is bolted to. He probably meant that you should port match the head to your newly ported intake manifold. You would want to do this because it is pointlesss other wise. Imagine a 3 inch pipe up to a 2 inch hole. Just because the pipe is 3 inches it doesnt mean that more air will go into the 2 inch hole. The only amount that would be able to go through would be 2 inches worth. Same thing for the head. If your intake manifold flows a lot of air but your head isnt port matched to that size, then its pointless to port you intake manifold. Porting the head is not a very easy task, but if your buddy is capable of doing it, why not.

 

[Wilfus65gs]

That is what i thought. It is actually my friends dad that is doing the work and my friend was telling me what he would be able to do. He probably got messed up somehow but i think that is what he was planning on doing. I am pretty sure that he is able to do it considering he has been working in a machine shop and working on cars for ever. The best part is that it will be free.

 

[GSGoinFast]

Im pretty sure he meant that you'll have to match your intake manifold to the HEAD, not the headers. The head is what the intake manifold is bolted to. He probably meant that you should port match the head to your newly ported intake manifold. You would want to do this because it is pointlesss other wise. Imagine a 3 inch pipe up to a 2 inch hole. Just because the pipe is 3 inches it doesnt mean that more air will go into the 2 inch hole. The only amount that would be able to go through would be 2 inches worth. Same thing for the head. If your intake manifold flows a lot of air but your head isnt port matched to that size, then its pointless to port you intake manifold. Porting the head is not a very easy task, but if your buddy is capable of doing it, why not.

I dissagree, and i use this example as a counter. its just like putting a K&N filter on your intake. its still the same size pipe, but since there is no restriction before the pipe, in the filter, the maximum amount of air the pipe can handle is flowing through it. same with the intake mani. if the intake mani is ported, then any restriction it imposed is now eliminated, so the head is the only thing restricting now. the restriction before the head is gone, so now the head can flow its maximum amount of air.

 

[miamieclipse]

ok i get what ure saying, but what Eclipsed is trying to say that it will have little effect. The intake manifold is one of the most restrictive things on our cars (or so i am told), if u can port that then u will see some gains, what eclipsed was trying to say is that you will not see the most hp UNTIL u port the head (id throw in the tb as well) becuase of the fact u have a smaller head going into a larger intake manifold outlet.

P.S. Yes it would be smart to have ure head, intake mani, & tb ported at the same time, but hey thats up to u
Good luck

 

[eclipse420a2nr]

miamieclipse, could you tell me how much it cost you to P&P ur head, mainfold and throttle body? thanks

 

[miamieclipse]

all depends who u go to, i have a buddy doing my i.m & tb, i am getting the head w/ a full race port (5 angle valve job, p&p intake n exhaust outlets, bor .35 over etc) that is going to cost me around if not a little over $500-550

Now i kno modern performance does tb, they charge 100$ here is a link to their site (u might also wnat to research the jeep tb mod instead of porting ure stock tb)
http://www.modernperformance.com/dcx/oneclipse.shtml

Regarding the head, well it says above where i got mine...it all depends on where u go, same said for the inake mani

 

[AEMEclipse140]

Modern performance doesnt just port t.b's they sell 60mm ones with adjustible throttle for $225 to youre door i beleive.

 

[eclipse420a2nr]

all depends who u go to, i have a buddy doing my i.m & tb, i am getting the head w/ a full race port (5 angle valve job, p&p intake n exhaust outlets, bor .35 over etc) that is going to cost me around if not a little over $500-550

Now i kno modern performance does tb, they charge 100$ here is a link to their site (u might also wnat to research the jeep tb mod instead of porting ure stock tb)
http://www.modernperformance.com/dcx/oneclipse.shtml

Regarding the head, well it says above where i got mine...it all depends on where u go, same said for the inake mani

alright thanks bud. i know that it varies from place too place i was just wanted a rough number to know so i know how much i much dough i'll probably have to lay out. my dad may get a deal on an intake manifold porting for his vette so hopefully i could get a deal too at the same time and only do the tb and mani cuz i can't afford to spend 500 bucks right now unlessi get a less extenbisve port job that might be in my budget. ill have to ask the guy when im there and then ill have the $ numbers.

 

[miamieclipse]

a guy on this forum, jayden1 has a friend who does head port work, ask him...ive seen some of his work and it looks good, i am considering getting itdone from him

 

[jayden1]

Im the one who told miami eclipse that the intake manifold is the most restrictive part of the intake assembly. Its been proven and proven over and over again. Ive seen the flow numbers for myself. If your buddy is going to port then go for it just make sure he gasketmatches it upper and lower intake manifold and leaves it slightly ruff for turbulence. You will see gains from the intake manifold being ported if its done correctly. Just going in it and hogging the thing out isnt gonna do it. If you want more info on head porting i can hook you up. Ask miami eclipse he gets info from me the little bastard. Lol he learning and hes a good friend. Acutally if you want it done right the first time i got some intakes ported already and read to ship. Ported by wide open throttle.

 

[miamieclipse]

hehe

 

[eclipse420a2nr]

... hm, my dad said it sounded like he knew what hes doing cuz the guy does his own work and has all out race vettes and with his own garage. as to the offer, thanks but i dont want to ship things out or buy a new head. how much power can i expect from just porting the intake manifold and TB? and about how much with that plus a medium P&P to the head? oh ya, a question i was wondering about. with performance headers, CAI, straight through muffler (i know a muffler, not a big difference), if i port the manifold, head and tb along with that, will there be enoguh fuel flow with stock injectors and pump to keep the mixture from going lean?

 

[GSGoinFast]

ok i get what ure saying, but what Eclipsed is trying to say that it will have little effect. The intake manifold is one of the most restrictive things on our cars (or so i am told), if u can port that then u will see some gains, what eclipsed was trying to say is that you will not see the most hp UNTIL u port the head (id throw in the tb as well) becuase of the fact u have a smaller head going into a larger intake manifold outlet.

P.S. Yes it would be smart to have ure head, intake mani, & tb ported at the same time, but hey thats up to u
Good luck

ya i know but i was just saying that it will have some affect.

and i dont think your going to run lean, you can run the stock injectors with 7psi of boost and you wont run lean, and i know your not getting the same amount of air in as with turbo

 

[eclipse420a2nr]

alright great, that means less money i have to dish out. defintely a good thing!

 

[AEMEclipse140]

Our intake manifolds look like rough concrete on the inside! anyone tried obx intake manifolds there are a couple of nice looking ones on ebay for 250 shipped from dailod he sold me 17lb 17's for 400 shipped hes a obx dealer.

 

[eclipse420a2nr]

yea, i've seen his auctions before. your better off just porting the stock manifold, unless your lookin for something that looks nice under the hood.

 

[Wilfus65gs]

do u know how much u can expect to gain from a ported and polished tb, intake manif, and head?

 

[GSGoinFast]

do u know how much u can expect to gain from a ported and polished tb, intake manif, and head?

according to 2gnt, you can gain 5hp from the tb, 8hp from the mani, and it all depends with the head. they say with an amazing job, and you have all the supporting mods before it, they say like up to 40hp i believ, but i dunno how accurate that is.

 

[eclipse420a2nr]

I'd say about 40+hp too.

 

[Wilfus65gs]

Is that 40 hp to the wheels or the flywheel? Also, what are all of the supporting mods that u guys are talking about?

 

[miamieclipse]

look it up bro, go to www.2ngt.com under section and under stages go to power stages and it will show u a basic outline that they have created.

 

[eclipse420a2nr]

im saying 40+hp flywheel. check out the tuning guide on this site (top left corner) for main upgrade for NT's.

 

[GSGoinFast]

2gnt says to the wheels, but i dunno how true that is