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NA 1.6 intake manifold help

2K views 21 replies 12 participants last post by  spitefulcheerio 
#1 ·
OK everyone, so i need some help. i've tried searching on here and i haven't been able to find the answers i need.

on the NA 1.6 intake manifold, there is a "nipple" for coolant. its on the front most cylinder runner close to the mounting flange. check the picture below for exact piece i'm talking about.





so, can this be blocked off? i've been told different things on this. i live in a hot weather area so i don't need coolant to heat the manifold, so if that is the purpose, then its unnecessary. also, where does the lead to? my motor was semi-disassembled when i got it so the other end of the tubing wasn't connected to anything.

also, for this same issue, on the flange side of the intake manifold, there is a port leading to the head. if i can cap off the hose and i do so, what do i do in reference to the manifold port? port is shown in pic here:



please help as if i can cap off the opennings, i need to do so tomorrow so i can send off the manifold to get powdercoated already.

thanks
 
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#3 ·
You speak too soon Maikeru...


If I recall correctly, that's a coolant source for the throttle body. The throttle body does INDEED use coolant to warm the throttle body to prevent throttle body icing in colder climes/high altitude conditions.
 
#6 ·
yeah it should be fine just to block but unless you can find a way to block the pathway not just the nipple you will have heated coolant just chillin (no pun intnded) in your intake manifold
 
#7 ·
i can have the pathway openning on the flange side welded shut with no problem but i just want to make sure that this would be ok to do. i've gotten mixed answers from people today as to whether i can do this mod or not.

can anyone give me a concrete answer as to whether i can eliminate this line altogether? also, where does the other end of the hose go to?

thanks
 
#9 ·
My buddy bought a Hondata intake manifold gasket for his NA6 and it included directions on how to block off the coolant paths on the manifold, I'd suggest sending Hondata a message saying you bought one of the gaskets but it has no instructions or whatever and that you were told you're supposed to block the paths off but you have no idea how ... might work. lol
 
#11 ·
if you are serious about that, then this is the way to go:

1) your idle air valve NEEDS coolant flow
2) get a cheap ebay EXTREME isolating gasket (blocks coolant completly9
3) get a teflon plate and make diy gaskets for the idle valve and the air valve
4) regrind idle valve coolant passage to allow flow without getting into the throttle body
5) route coolant line from the back of the head (unused nipple) to idle valve.

The two small holes inside the gasket are from cnc port matching




 
#12 ·
if you are serious about that, then this is the way to go:

1) your idle air valve NEEDS coolant flow
2) get a cheap ebay EXTREME isolating gasket (blocks coolant completly9
3) get a teflon plate and make diy gaskets for the idle valve and the air valve
4) regrind idle valve coolant passage to allow flow without getting into the throttle body
5) route coolant line from the back of the head (unused nipple) to idle valve.

The two small holes inside the gasket are from cnc port matching




OK, i already ordered that exact same manifold gasket, so thats on its way and taken care of.

now, i don't understand items 3,4,5 from your list. the valve that sits on the plenum of the intake manifold i have already decided to delete and i've made the block off plate as i've seen many do. please take into consideration that i'll be running a megasquirt ecu when the car finally gets put together and fired up.

i'm not sure what your asking me to do from the last two pictures still.

well, i'm taking the manifold back to my machinist today and having him remove the nipple from the outer part of the manifold and he is going to tap the openning and install a bolt or something there so its reusable and i'll just leave the flange side alone since the gasket i purchased blocks that part off already.
 
#13 ·
i#m not to familar with the MS, so i don't know wether the idler valve is still needed.

The problem with the valve is:

the entry and the exit of the water passage are only connected through the throttlebody.
this means coolant flow through the throttle body itself.
you can make a heat transfer block off plate out of teflon like i did, but this blocks also water circulation through the idle valve.
so you have to grind the small "septum" between inlet and exit doen to allow a direct flow through the idle valve.
 
#14 ·
Alex in order to block the intake manifold from getting coolant you need to buy a plug and block the cylinder head as I did on my NB. If you are rebuilding the cylinder head the machine shop can do this for you, but you can buy the corresponding plug from napa, Dave can help you with this project. You also have the option of removing the brass nipples and welding, tap or sealing them. The rest of the stuff including buying the phenolic gasket is a good idea too.
 
#15 ·
Eli, we'll be talking over the subject alot more tomorrow when we get together to work on my project i guess.

for now, i'm just gonna have the machinist pull the "nipple" from the manifold and tap it for a plug. then its off to the powdercoater.

thanks everyone for the assistance
 
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