Why are there archs in the exhaust ports and why exactly do they call em 6-ports?
#1
Why are there archs in the exhaust ports and why exactly do they call em 6-ports?
I'm about to put my RB header on and i was looking around. First of all what the hell are those square type arches in the 2 big exhaust ports for? and where are the 5-6th ports? all i c is 2 big ports and 2 small pencil size holes below each big port. I can see the acuators in all but where are the ports and what are the 2 very small holes below each big port for? I'm thinking about removing the 5-6th ports becuz i won't have enough pressure to open them anyway, and have heard they are a big obstruction.
#2
Lives on the Forum
Those are exhaust port inserts; they are designed to supress exhaust noise.
The 5th/6th ports are in the intake.  You'll see the actuators on the bottom of the intake manifold.  If you want to see them, you need to remove the lower intake manifold.
-Ted
The 5th/6th ports are in the intake.  You'll see the actuators on the bottom of the intake manifold.  If you want to see them, you need to remove the lower intake manifold.
-Ted
#3
thanks Ted. But aren't those exhaust inserts an obstruction to exhaust flow? So if those 5/6th ports are exhaust ports where do they open to? I don't understand where they get exhaust gases from and where they shoot them too. Are they another port on the housings, like another hole next to the exhaust ports? When i was looking into the exhaust ports i didn't see where the 5/6th ports shot the exhaust gases too, there are only 2 holes. shouldn't there be 4? 2 for the main exhaust ports and 2 for the 5/6th ports. thanks for your patience w/ a newb to the ports
#4
Lives on the Forum
Originally posted by 1Revvin7
But aren't those exhaust inserts an obstruction to exhaust flow?
But aren't those exhaust inserts an obstruction to exhaust flow?
So if those 5/6th ports are exhaust ports where do they open to?
-Ted
#6
I'm a boost creep...
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Here's a pic of a 6-port engine with the manifold off.
You can see there are six inlet ports on the cast iron plates (hence the name) and two exhaust ports on the rotor housings.
You can see there are six inlet ports on the cast iron plates (hence the name) and two exhaust ports on the rotor housings.
#7
Re: Why are there archs in the exhaust ports and why exactly do they call em 6-ports?
Originally posted by 1Revvin7
all i c is 2 big ports and 2 small pencil size holes below each big port....what are the 2 very small holes below each big port for?
all i c is 2 big ports and 2 small pencil size holes below each big port....what are the 2 very small holes below each big port for?
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#10
Re: Re: Why are there archs in the exhaust ports and why exactly do they call em 6-ports?
Originally posted by ka8legend
Yeah what are they for, sharpening pencils:
Yeah what are they for, sharpening pencils:
#11
HAILERS
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MY goodness gracious, said Hailers. The approx one half inch holes below the large exaust ports are part of your emissions system. On a 87 model only one is open to the exaust manifold. Its for the EGR VALVE which on a 87 na is on top of the engine. The exaust gas flows thru the hole, thru a passage in the intermediate housing, to the egr valve. There is flow only when the egr is opened which the best I can tell from observing the voltage at the ECU, is during light acceleration. The other four holes are inoperable on a 87 na. They are covered by the exaust gasket. There is a hole in the exaust gasket for that ONE hole though. And like the man said, if you want to see the auxillary INLET ports, you need to take the intake manifold off. Just take you a few minutes. The best thing you can do is repair the actuators, the sleeves or which ever part of the aux port system that is broken. Those that can't, remove them. Those that can, repair them and make them work. Your choice. Step up to the plate.
#12
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The other two INTAKE ports are shown graphicaly in this url: http://www.goldcoastinspections.com/...ortdrawing.jpg
#13
Super Newbie
Re: Re: Re: Why are there archs in the exhaust ports and why exactly do they call em 6-ports?
Originally posted by 1Revvin7
that and one more thing, do the TII housings have bigger intake ports since they don't have the 5/6th ports or do they have a better flow? Cuz if i was going to have a rebuild i might as well get all the goods u know!
that and one more thing, do the TII housings have bigger intake ports since they don't have the 5/6th ports or do they have a better flow? Cuz if i was going to have a rebuild i might as well get all the goods u know!
Only peripheral port engines use intake ports in the rotor housings.
#14
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Go to http://www.iluvmyrx7.com and there you will find a FREE download of the factory service manual.
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