Na Primary Plate Ported...
02-20-2004, 12:54 PM
#11
Super Moderator
Join Date: Sep 2002
Location: Savannah, Ga
Posts: 2,763
The S5 n/a center housing has identical casting to S4 and S5 TII centers. I have measured both, and its also stated on Mazdatrix's website.
Kahren, did you see the pics of my intake ports on the exhaust port thread? If you do it right, you can go a good bit bigger than that on the center. You just have to angle the upper edge.
Ill post a pic of what I use to measure the casting thickness later. Im sure a lot of people here could benefit from it.
Kahren, did you see the pics of my intake ports on the exhaust port thread? If you do it right, you can go a good bit bigger than that on the center. You just have to angle the upper edge.
Ill post a pic of what I use to measure the casting thickness later. Im sure a lot of people here could benefit from it.
02-20-2004, 01:04 PM
#13
Senior Member
Thread Starter
Join Date: Jan 2002
Location: CT
Posts: 1,345
Originally Posted by mazdaspeed7' date='Feb 20 2004, 01:54 PM
If you do it right, you can go a good bit bigger than that on the center. You just have to angle the upper edge.
Ill post a pic of what I use to measure the casting thickness later. Im sure a lot of people here could benefit from it.
Ill post a pic of what I use to measure the casting thickness later. Im sure a lot of people here could benefit from it.
even a simple solid strand of wire going into the top of the water passege DOWN to the port casting will tell u its very similar. and why would mazda have all these diffrent castings, it only makes sence. i just have seen many times before "u can port the turbo primary more" from many people are then forums which is not true
i havent seen this on the mazdatrix site though
02-20-2004, 02:08 PM
#14
Senior Member
Thread Starter
Join Date: Jan 2002
Location: CT
Posts: 1,345
Originally Posted by ArmyOfOne' date='Feb 20 2004, 09:57 AM
I can see where you are coming from. Is this going into an FC?
I ask because since mine is going into an FB I don't have as much weight to deal with so I can afford to lose a bit on low end... but once it goes over 5k... Watch Out!
I ask because since mine is going into an FB I don't have as much weight to deal with so I can afford to lose a bit on low end... but once it goes over 5k... Watch Out!
02-20-2004, 06:01 PM
#16
Senior Member
Join Date: Jun 2003
Location: Chicago
Posts: 226
heh, I ported mine almost as much as yours(primaries)
I was lucky enough to be able to pick up a s4 tII center housing not too long ago. There is a little bit more there to be ported but not much.
Anyways, ports look good. What else is goin in this engne?
I was lucky enough to be able to pick up a s4 tII center housing not too long ago. There is a little bit more there to be ported but not much.
Anyways, ports look good. What else is goin in this engne?
02-22-2004, 10:40 AM
#17
Senior Member
Join Date: Oct 2003
Location: Fort Lewis Washington
Posts: 705
Hey kahren we discussed the bottom edge of the port being rounded and small before.
I took a good look at a half assembled block and checked the opening and closing of your type of port. I saw that the port actually opens from top to bottom on a street port. So you could actually benefit from opening the bottom a bit more. It should actually allow for better low RPM torque by allowing the A/F mix to continue to feed into the next chamber.
I took a good look at a half assembled block and checked the opening and closing of your type of port. I saw that the port actually opens from top to bottom on a street port. So you could actually benefit from opening the bottom a bit more. It should actually allow for better low RPM torque by allowing the A/F mix to continue to feed into the next chamber.
02-22-2004, 01:11 PM
#20
Senior Member
Thread Starter
Join Date: Jan 2002
Location: CT
Posts: 1,345
actually when the rotor starts to open the port, it does so from the middle of the port hole, so not having the top ported out and the bottom ported out u can keep less flow and overlap at the early stage of the port openning and that would help keep the low end thats the logic behind that. if i ported the port wall more stright up and down the port would open more sudden. there is no more early overlap on that port in the early stage then there is stock, there will just be slighly more flow.