if you have ported your intake manifolds PLEASE READ.
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777** The Anti-rice
Joined: Sep 2002
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From: Seattle, WA
if you have ported your intake manifolds PLEASE READ.
Ok I have all of my intake off and removed the 6pi system already and made the blockoff plates, etc. I was thinking I might as well port the intake manifolds while they are off, and i read the thread in the arhcive concerning this, but i dont get what they are trying to say at all, ive read it like 3 times: https://www.rx7club.com/showthread.p...5&pagenumber=1
Wtf? An image A, I seriously dont understand. And I also dont get what he is talking about when he says to use the gasket to trace where youre supposed to port, because my gasket fits perfectly to the holes it seems... if anybody has pictures of the ported manifolds, thatd be great. All the pics on that thread are Red X's and mazdaspeed7 's website doesnt work..
so help me out if you can!
Here's where it begins. On the top end (goes to the TOP part that says "13B Injection on it" **GOES TO, NOT THE "13B INJECTION" ONE ITSELF** Notice that the gastek is slightly bigger than the two middle holes. This is because the air flow from bigger --> Smaller. Take a scribe and trace the gasted markings as a boundry. Take the drill and postition the bit against the wall you're porting and fire it up. Apply moderate pressure and work by SLIDING the drill up and down to go "in" deeper, but move it side to side to KEEP THE PORTING EVEN. Otherwise, you will end up with "ruts" or uneven "valleys" on the edge --instead of a smooth circle. This should take about 20-30 mins, go SLOWLY and steadily, if you think you're going too thin or are gonna poke a hole in the metal, STOP. Use common sense and judgement. When it's finished, it'll look something like IMAGE A.
so help me out if you can!
Joined: Dec 2001
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From: NY, MA, MI, OR, TX, and now LA or AZ!
Basically they're saying mark the size of the port from the gasket onto the metal itself, insert the drill tip and turn the drill on, move the bit up and down against the metal you're trying to grind away as well as back and forth to evenly remove material instead of holding it in one place. I don't have pictures, but it's pretty simple once you understand what he's saying.
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777** The Anti-rice
Joined: Sep 2002
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From: Seattle, WA
Originally posted by Tofuball
If you gaskets all fit the ports perfectly, then rejoice!
If you gaskets all fit the ports perfectly, then rejoice!
It was really confusing because i couldnt "trace" anything because the gasket fit well.
Like Ghandi with a gun
Joined: Mar 2003
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From: Rapid City, SD
Bah, just port match to the gaskets (or slightly over and then cut the gasket) thats what I did...
I don't know how much of a change it is, but porting to match the gasket im sure helps some, keeps extra gasket from catchign air and causing turbulance maybe...
By porting to the gasket, you know both sides line up perfectly...
I don't know how much of a change it is, but porting to match the gasket im sure helps some, keeps extra gasket from catchign air and causing turbulance maybe...
By porting to the gasket, you know both sides line up perfectly...
Full Member
Joined: May 2004
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From: lapeer michigan
I have never ported a Mazda INtake but have done several conventional porting jobs and useually it is a little more intailed than gasket matching. Is there no benifit to opening up the inner chambering? I have access to a flow bench and would like to try my hand on the Mazda intake. perhaps I can get with one of my Mazda buddys here in michigan to supply an intake to work on. On the standard V8 engine all the best mods are in the fuel, intake and exhaust areas. I have built several very fast cars, just never a RX7.
Yet!
Yet!
Jesus is the Messiah
Joined: May 2003
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From: Silver Spring, MD
The biggest spot I found in need of porting is where the secondary fuel injectors enter the middle intake manifold :O
Oh yeh, and the two 'oval' shaped ports on the LIM, those were WAY off for me.
I also knife-edged the bridge between the aux ports and the side ports (on the inside), Then polished the aux port side and roughed up the other port.
My LIM to MIM gasket was WAYYY off. Needed TONS of porting. I put two screws into it for the oil injector holes, using RTV black, and smoothed those into the side as well. The LIM by FAR took me the most time, followed by the MIM (the LIM side needed the most for the injectors and gasket matching then the UIM side)
Oh yeh, and the two 'oval' shaped ports on the LIM, those were WAY off for me.
I also knife-edged the bridge between the aux ports and the side ports (on the inside), Then polished the aux port side and roughed up the other port.
My LIM to MIM gasket was WAYYY off. Needed TONS of porting. I put two screws into it for the oil injector holes, using RTV black, and smoothed those into the side as well. The LIM by FAR took me the most time, followed by the MIM (the LIM side needed the most for the injectors and gasket matching then the UIM side)
Last edited by Tofuball; Jun 5, 2004 at 09:02 AM.
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Lava Surfer
Joined: Mar 2002
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From: Kailua, HI
Originally posted by DEZERTE
in otherwords there is no need to port the manifold?
It was really confusing because i couldnt "trace" anything because the gasket fit well.
in otherwords there is no need to port the manifold?
It was really confusing because i couldnt "trace" anything because the gasket fit well.
Junior Member
Joined: Mar 2004
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From: CT
when i did mine i found that the middle manifold matched the gasket almost perfectly while the tp mani needed every port to be enlargedjust a bit.
the best way to do this is to flop the gasket back and forth, shaving it down, until no gasket over hangs any port on either side. then trace out the areas on either side that the gasket doesnt cover with a sharpie.grind away the marked parts, then doule check against the gasket. this way, both manifolds, and the gasket will have IDENTICAL dimensions.
the best way to do this is to flop the gasket back and forth, shaving it down, until no gasket over hangs any port on either side. then trace out the areas on either side that the gasket doesnt cover with a sharpie.grind away the marked parts, then doule check against the gasket. this way, both manifolds, and the gasket will have IDENTICAL dimensions.
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777** The Anti-rice
Joined: Sep 2002
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From: Seattle, WA
should i worry about getting water/degreaser i the vdi area when im cleaning up?
I see what you all mean by gasket matching, i took a look this morning, traced and started porting. So far the only one I have done is the exten. manifold.
I see what you all mean by gasket matching, i took a look this morning, traced and started porting. So far the only one I have done is the exten. manifold.
Jesus is the Messiah
Joined: May 2003
Posts: 4,848
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From: Silver Spring, MD
No, the VDI system can be completely removed.
Ok, let me rephrase that:
Remove the VDI system while you're porting the manifold.
Then clean it all out when you're done and reinstall it.
Ok, let me rephrase that:
Remove the VDI system while you're porting the manifold.
Then clean it all out when you're done and reinstall it.
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