Two porting questions
11-21-02, 12:20 PM
#1
Two porting questions
I just purchased the RB street port templates, after receiving the templates, two questions arised inmediately 
1) What guide lines do use to port the intake port that meets\face the lower intake manifold?
2) Do I use the same template for the primary and secondary ports?
I searched for this info, didn't find any info on the first question, and some contrdictory info the second one
1) What guide lines do use to port the intake port that meets\face the lower intake manifold?
2) Do I use the same template for the primary and secondary ports?
I searched for this info, didn't find any info on the first question, and some contrdictory info the second one
11-21-02, 02:14 PM
#2
Weird Cat Man
1) The RB templates (at least the ones I have seen) don't tell you anything about porting the opening that matches up with the lower intake manifold. You will have to do those by hand if you so desire, but that's nother topic.
(Didn't you get instructions with those?)
2) You will get different answers on this... Some people make all the ports as big as possible. Other people (like me) try to keep things in proportion. I made my secondaries about the full size of the RB template but you can even go a little more (at least on a third gen, dunno about a 2nd or 1st). I did my primaries completely by hand and just opened them up but kept them proportional to the original relationship between the primary and secondary ports. I could have gone substantially bigger here but I wanted to keep a nice idle and so on. If I crack the engine open again, I will probably go a little bigger on the primaries than I did the first time.
Regards,
Brian
(Didn't you get instructions with those?)
2) You will get different answers on this... Some people make all the ports as big as possible. Other people (like me) try to keep things in proportion. I made my secondaries about the full size of the RB template but you can even go a little more (at least on a third gen, dunno about a 2nd or 1st). I did my primaries completely by hand and just opened them up but kept them proportional to the original relationship between the primary and secondary ports. I could have gone substantially bigger here but I wanted to keep a nice idle and so on. If I crack the engine open again, I will probably go a little bigger on the primaries than I did the first time.
Regards,
Brian
11-21-02, 03:42 PM
#3
Originally posted by Wargasm
1) The RB templates (at least the ones I have seen) don't tell you anything about porting the opening that matches up with the lower intake manifold. You will have to do those by hand if you so desire, but that's nother topic.
(Didn't you get instructions with those?)
2) You will get different answers on this... Some people make all the ports as big as possible. Other people (like me) try to keep things in proportion. I made my secondaries about the full size of the RB template but you can even go a little more (at least on a third gen, dunno about a 2nd or 1st). I did my primaries completely by hand and just opened them up but kept them proportional to the original relationship between the primary and secondary ports. I could have gone substantially bigger here but I wanted to keep a nice idle and so on. If I crack the engine open again, I will probably go a little bigger on the primaries than I did the first time.
Regards,
Brian
1) The RB templates (at least the ones I have seen) don't tell you anything about porting the opening that matches up with the lower intake manifold. You will have to do those by hand if you so desire, but that's nother topic.
(Didn't you get instructions with those?)
2) You will get different answers on this... Some people make all the ports as big as possible. Other people (like me) try to keep things in proportion. I made my secondaries about the full size of the RB template but you can even go a little more (at least on a third gen, dunno about a 2nd or 1st). I did my primaries completely by hand and just opened them up but kept them proportional to the original relationship between the primary and secondary ports. I could have gone substantially bigger here but I wanted to keep a nice idle and so on. If I crack the engine open again, I will probably go a little bigger on the primaries than I did the first time.
Regards,
Brian
I know tuners port the opening that matches up with the LIM. How do I know how big I can go?I did got the instructions, but they are not very specific in this particular area
From what I gather based on my search, if you port the primary and secondary to an equal size; the engine will loose hp\tq at the bottom but will pickup at higher rpms.........I'm confused!!
BTW - Its for a 2nd gen T2
Thanks for the info!!
11-22-02, 08:19 AM
#4
Originally posted by KNONFS
I know tuners port the opening that matches up with the LIM. How do I know how big I can go?
From what I gather based on my search, if you port the primary and secondary to an equal size; the engine will loose hp\tq at the bottom but will pickup at higher rpms.........I'm confused!!
I know tuners port the opening that matches up with the LIM. How do I know how big I can go?
From what I gather based on my search, if you port the primary and secondary to an equal size; the engine will loose hp\tq at the bottom but will pickup at higher rpms.........I'm confused!!
To port match the inlet you simply place the gasket over the housing, and mark the metal around the port that is smaller than the gasket. This is why they refer to it as "gasket matching". Going any larger than the gasket isn't going to improve flow in any way. it could eventually create unwanted turbulance...
Hope that helps.
Eric.
11-22-02, 08:57 AM
#5
I've ported a T-II engine based off of that template. It works for the secondary ports just fine. If you try to port the primaries that big you will quickly discover where the water jacket is!!! The T-II intermediate housing ports are similar in size to the n/a ports but can go a little larger. You can feel inside the water jacket with your finger behind the port to see where the metal ends. You can even see it as a discoloration on the face of the housing itself. If you use the template you can pretty much go all the way up just not all the way down. You only want to go down about a quarter of an inch or so. Please be careful and check several times before you do it just to be sure. I've ported several now and no longer need a template but it is a good starting point guide until you learn what to look for.
I don't like to exactly match the lower intake manifold to the engine. My runners in the engine itself are always slightly larger than the runners in the lower manifold. This creates a slight lip which helps stop reversion. It is far more beneficial than straight port matching. I also don't enlarge the runners going into the engine. The intake manifolds are the big restriction not the runners in the engine itself. If you were going for insanely high numbers I'd englarge them but just clean them up. Good luck.
I don't like to exactly match the lower intake manifold to the engine. My runners in the engine itself are always slightly larger than the runners in the lower manifold. This creates a slight lip which helps stop reversion. It is far more beneficial than straight port matching. I also don't enlarge the runners going into the engine. The intake manifolds are the big restriction not the runners in the engine itself. If you were going for insanely high numbers I'd englarge them but just clean them up. Good luck.
11-22-02, 03:36 PM
#6
Lives on the Forum
I matchport the lower intake manifold to engine intake ports with the stock gasket.
I also enlarge the runner inside the side housings.  Every little bit helps - the restriction is not the runners; it's the turbo itself on a turbo engine.
I tend to port a LOT more than most others on FC 13BT engines.
Rough job on Stage I Kouki primary porting on the center housing:
-Ted
I also enlarge the runner inside the side housings.  Every little bit helps - the restriction is not the runners; it's the turbo itself on a turbo engine.
I tend to port a LOT more than most others on FC 13BT engines.
Rough job on Stage I Kouki primary porting on the center housing:
-Ted
Trending Topics
11-23-02, 02:52 PM
#10
inteligent extratarestril
Join Date: Mar 2001
Location: The Sunny B.O.P, New Zealand
Posts: 1,313
Likes: 0
Received 0 Likes
on
0 Posts
whats up with guys saying you cant port the centre plate much? they can be lifted enough to match the closing timing of the secondary ports once the secondary ports have been lifted approx 10mm or so
11-24-02, 10:05 AM
#11
Freedoms worth a buck o'5
Join Date: May 2001
Location: Calgary Alberta Canada
Posts: 2,544
Likes: 0
Received 1 Like
on
1 Post
Originally posted by setzep
is that you in your avatar Max? Sorry for not adding to the thread but I coulden't help when I saw that avatar.
is that you in your avatar Max? Sorry for not adding to the thread but I coulden't help when I saw that avatar.
...HWO: got any good porting links or pics you want to share before I power up my diegrinder next week?...Max
11-24-02, 12:53 PM
#13
HWO: You are correct about being able to go up on the primary ports the same as the secondaries. That is how my T-II block is done. You just can't go down very far.
Ted brings up a very good point about the turbo being the big restrction overall. BDC does enlarge the runners a little as Ted does and has put down some impressive hp numbers. Some do it and some don't just use your discretion here. Don't get too carried away or you'll find water!
Ted brings up a very good point about the turbo being the big restrction overall. BDC does enlarge the runners a little as Ted does and has put down some impressive hp numbers. Some do it and some don't just use your discretion here. Don't get too carried away or you'll find water!
11-24-02, 11:05 PM
#14
WingmaN
Join Date: Aug 2002
Location: Fort Worth Texas
Posts: 4,324
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by Maxthe7man
hhaahaa.. No its not me, I have been finding pics of the dorkiest people I can and making them into avatars just for laughs, Rx7_turbo2 and myself have a little competition going on for the stupidest looking avatar, his is priceless......
HWO: got any good porting links or pics you want to share before I power up my diegrinder next week?...Max
hhaahaa.. No its not me, I have been finding pics of the dorkiest people I can and making them into avatars just for laughs, Rx7_turbo2 and myself have a little competition going on for the stupidest looking avatar, his is priceless...
...HWO: got any good porting links or pics you want to share before I power up my diegrinder next week?...Max
Well if you like really fugged up looking pics of people Max check this out. There is a web site www.mulletsgalore.com Anytime anyone feels like they are the biggest fuggup in the world you need to send them there for a little picker upper! Go to to "Picturebooks" link.
Here is one of the many "winners" out there
11-25-02, 11:01 PM
#15
inteligent extratarestril
Join Date: Mar 2001
Location: The Sunny B.O.P, New Zealand
Posts: 1,313
Likes: 0
Received 0 Likes
on
0 Posts
how i ported my engine
i did alot of research into port timing and the powerbands they produced i then made up a 'port timing' guage and worked out where i need the ports closing to have a port timing of around 74-75 degrees ATDC. this was the secondary ports lifted approx 10mm.
I then ground all the rough casting outta the port runner and polished it smooth to aid in better air flow, i then made a template of the secondary ports and used them to get the same port opening and closing timing on the primary ports as the secondary ports now had.
I then did a bit of research into turbo spec bridge ports and proceeded to cut a bridge in the upper half of the seconday ports, so the secondary ports now open approx 25-30 degrees earlier than they used to.
Exhuast ports were dropped, lifted, widend and smoothed out
i did alot of research into port timing and the powerbands they produced i then made up a 'port timing' guage and worked out where i need the ports closing to have a port timing of around 74-75 degrees ATDC. this was the secondary ports lifted approx 10mm.
I then ground all the rough casting outta the port runner and polished it smooth to aid in better air flow, i then made a template of the secondary ports and used them to get the same port opening and closing timing on the primary ports as the secondary ports now had.
I then did a bit of research into turbo spec bridge ports and proceeded to cut a bridge in the upper half of the seconday ports, so the secondary ports now open approx 25-30 degrees earlier than they used to.
Exhuast ports were dropped, lifted, widend and smoothed out
11-26-02, 11:04 AM
#16
Originally posted by HWO
how i ported my engine
i did alot of research into port timing and the powerbands they produced i then made up a 'port timing' guage and worked out where i need the ports closing to have a port timing of around 74-75 degrees ATDC. this was the secondary ports lifted approx 10mm.
I then ground all the rough casting outta the port runner and polished it smooth to aid in better air flow, i then made a template of the secondary ports and used them to get the same port opening and closing timing on the primary ports as the secondary ports now had.
I then did a bit of research into turbo spec bridge ports and proceeded to cut a bridge in the upper half of the seconday ports, so the secondary ports now open approx 25-30 degrees earlier than they used to.
Exhuast ports were dropped, lifted, widend and smoothed out
how i ported my engine
i did alot of research into port timing and the powerbands they produced i then made up a 'port timing' guage and worked out where i need the ports closing to have a port timing of around 74-75 degrees ATDC. this was the secondary ports lifted approx 10mm.
I then ground all the rough casting outta the port runner and polished it smooth to aid in better air flow, i then made a template of the secondary ports and used them to get the same port opening and closing timing on the primary ports as the secondary ports now had.
I then did a bit of research into turbo spec bridge ports and proceeded to cut a bridge in the upper half of the seconday ports, so the secondary ports now open approx 25-30 degrees earlier than they used to.
Exhuast ports were dropped, lifted, widend and smoothed out
So what you are saying is that you match port the primary's with a template you build from the secondaries?
Did you ported the u shape on the primaries? Did you ported donward on the u shape on the primaries?
Hope to hear from you soon
Thanks,
Elio
11-27-02, 05:22 PM
#17
Lives on the Forum
Yes, you can port the primaries as large as the secondaries.  This also minimizes the reversion crud that normal dirties the secondary passages like all stock engines do.  This also gives you potential for more power.  The Kouki 13BT's can especially have better gains since they open 10-degrees LATER than the Zenki 13BT's!
The port I showed was the beginnings of a Stage I port job, which trades a little power for streetability.
Now, if we're going to argue about streetability, that's a whole nother ball game!
Do I need to repeat that RICE RACING is CRAZY?
-Ted
The port I showed was the beginnings of a Stage I port job, which trades a little power for streetability.
Now, if we're going to argue about streetability, that's a whole nother ball game!
Do I need to repeat that RICE RACING is CRAZY?
-Ted
11-27-02, 05:46 PM
#18
Whole new question
I called Mazdatrix and they said that the street port templates from RB are too small for the 87+ intakes ports!! They mention something about the RB template being too small for the secondaries, and too big for the primaries (or something like that on the primaries).
So did I waste my HARD EARN $$$ on the RB ones?
I need sugestions on this matter.
Here is what I've done so far:
1 - Ported the primaries to the EXACT shape of RB templates.
2 - Ported the the upper secondary port to the exact shape of the RB template without touching the lower "U" shape part of the port.
Can I port more on the secondaries? Based on Mazdatrix you can, but how much more? and going up or to the sides of the port?
Damn I don't want to spend another $52 bucks!!
Please HELP
I called Mazdatrix and they said that the street port templates from RB are too small for the 87+ intakes ports!! They mention something about the RB template being too small for the secondaries, and too big for the primaries (or something like that on the primaries).
So did I waste my HARD EARN $$$ on the RB ones?
I need sugestions on this matter.
Here is what I've done so far:
1 - Ported the primaries to the EXACT shape of RB templates.
2 - Ported the the upper secondary port to the exact shape of the RB template without touching the lower "U" shape part of the port.
Can I port more on the secondaries? Based on Mazdatrix you can, but how much more? and going up or to the sides of the port?
Damn I don't want to spend another $52 bucks!!
Please HELP
Last edited by KNONFS; 11-27-02 at 05:49 PM.
11-27-02, 10:49 PM
#19
inteligent extratarestril
Join Date: Mar 2001
Location: The Sunny B.O.P, New Zealand
Posts: 1,313
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by KNONFS
Hey man,
So what you are saying is that you match port the primary's with a template you build from the secondaries?
Did you ported the u shape on the primaries? Did you ported donward on the u shape on the primaries?
Hope to hear from you soon
Thanks,
Elio
Hey man,
So what you are saying is that you match port the primary's with a template you build from the secondaries?
Did you ported the u shape on the primaries? Did you ported donward on the u shape on the primaries?
Hope to hear from you soon
Thanks,
Elio
I didn't drop the primaries down as much as the secondaries, i did open up the bottom of the primary ports a bit, using the bottow of the port runner as a guide.
