6 port large streetport

Kush47 · 07-03-2012, 12:44 AM

I want to attempt to port my 6 port motor, I need to kno wats the biggest street port I can go for secondary and primary ports with the best results. Pics would be helpful. Thank you

rotarycrazy · 07-03-2012, 10:17 AM

the secondary ports you cant really port a whole lot since the port timing on the closing is already stupid late on them. The primary port you can go fairly large pineapple racing makes about the biggest 6 port template I would do to actually be able to drive it.

Kush47 · 07-03-2012, 03:45 PM

How about turning the 6 ports into 4 ports by cutting threw the little space between the ports and making it larger??. Has anybody done this before? And would there be better results and more power by doing this?? Thank you

RotorDad · 07-03-2012, 05:57 PM

I have seen pics of what you are asking, but I know nothing of the end results of such a port job.

RX200013B · 07-03-2012, 06:34 PM

don't do it unless you have a 12k rpm engine, racing gear box, etc.....

RETed · 07-03-2012, 08:51 PM

Too vague of a question...

-Ted

rotarycrazy · 07-04-2012, 08:21 AM

that would be way way too much unless you are boosting the piss out of it and then it will be nothing more than a purpose built drag engine.

N.RotaryTech · 07-04-2012, 01:50 PM

I for one do believe in the 6-port engine. One reason is that most everyone doesn't believe that they are capable of more power.
Although I don't have many 6-port engine experiences I do have a few.

My first one was a S5 6-port with a "Mild street port" that was built by a builder in my state.
This motor sucked. Even with the few mods I had on it: RB pre-silencer and mufflers, emissions removed, AC removed, k&n air filter. It dynoed at only 130hp.
After 5 years of driving it I tore it apart to see what was done to it. This is what I found:

The center iron was ported like this:

The end irons were ported like this:
(The plastic is a poor template I made from stock ports.)

My second motor I swear by. I built it and ported it.
Although this motor is a half bridge port S4. Mods were where the previous motor left off, but with the addition of power-steering removed, and a Clutch Masters stage 2 Carbon Kevlar clutch. Also, stock ecu, stock transmission, etc.
This is what the end irons look like:

The center iron was stock.
Most of the performance I'm about to go over is probably because of the bridge ports.
This motor would spin the top of 1st, chirp 2nd.
It reved fast.
Power was felt from 4k to 6.5k rpms. When in that range, it hauled ass.
The drawbacks were no guts below 3k rpms, and it was a gas guzzler.

My 3rd motor is what I have in my FC currently. (Using the 1st engine I mentioned) end irons and a stock port center iron. S4 rotors. With the addition of a haltech E6K.
I believe it has more power than my first motor. Better gas mileage too.
I really should get this dynoed.

Just my 2 cents from my experiences.

infernosg · 07-04-2012, 02:38 PM

Ditch the 6 port and look for TII 4 port irons. Boosted or N/A they yield better results. I personally prefer S4 TII irons since the primary and secondary port timing is identical.

07-03-2012, 12:44 AM	#1
Kush47 The Newbie Join Date: Apr 2011 Posts: 11 Rep Power: 0	6 port large streetport I want to attempt to port my 6 port motor, I need to kno wats the biggest street port I can go for secondary and primary ports with the best results. Pics would be helpful. Thank you

07-03-2012, 05:57 PM	#4
RotorDad Big Ugly Join Date: Apr 2009 Location: Fredericksburg, Va Posts: 591 Rep Power: 16	I have seen pics of what you are asking, but I know nothing of the end results of such a port job. __________________ *Boosted Big Body On 335's* PS3 ID: Rotordad 1986 Mazda RX7 GXL - Street ported 13BT, Haltech, 62mm, ect. 2006 MazdaSpeed 6 - Eagle, Wiseco, Cobb, ect.

07-04-2012, 01:50 PM	#8
N.RotaryTech Home-brew Rotary Join Date: Feb 2008 Location: GooseCreek SC Posts: 552 Rep Power: 18	I for one do believe in the 6-port engine. One reason is that most everyone doesn't believe that they are capable of more power. Although I don't have many 6-port engine experiences I do have a few. My first one was a S5 6-port with a "Mild street port" that was built by a builder in my state. This motor sucked. Even with the few mods I had on it: RB pre-silencer and mufflers, emissions removed, AC removed, k&n air filter. It dynoed at only 130hp. After 5 years of driving it I tore it apart to see what was done to it. This is what I found: The center iron was ported like this: The end irons were ported like this: (The plastic is a poor template I made from stock ports.) My second motor I swear by. I built it and ported it. Although this motor is a half bridge port S4. Mods were where the previous motor left off, but with the addition of power-steering removed, and a Clutch Masters stage 2 Carbon Kevlar clutch. Also, stock ecu, stock transmission, etc. This is what the end irons look like: The center iron was stock. Most of the performance I'm about to go over is probably because of the bridge ports. This motor would spin the top of 1st, chirp 2nd. It reved fast. Power was felt from 4k to 6.5k rpms. When in that range, it hauled ass. The drawbacks were no guts below 3k rpms, and it was a gas guzzler. My 3rd motor is what I have in my FC currently. (Using the 1st engine I mentioned) end irons and a stock port center iron. S4 rotors. With the addition of a haltech E6K. I believe it has more power than my first motor. Better gas mileage too. I really should get this dynoed. Just my 2 cents from my experiences. __________________ '89 RX7 GTU, half-Bridge-port S4/S5 NA, E6K, Full RB exhaust, weekend warrior. '83 RX7, The "this might take awhile" project. '87 RX7 GXL, Rest In Pieces. '98 Subaru Impreza Outback-sport, rx7 rescue vehicle, down for repair. '94 Ford Ranger, daily.

07-04-2012, 02:38 PM	#9
infernosg IT'S ALIVE! Join Date: Dec 2009 Location: Richmond, VA Posts: 811 Rep Power: 16	Ditch the 6 port and look for TII 4 port irons. Boosted or N/A they yield better results. I personally prefer S4 TII irons since the primary and secondary port timing is identical. __________________ '86 Mazda RX-7 Base '79 Mazda RX-7 GS

07-03-2012, 10:17 AM	#2
rotarycrazy Rotary Fan in Training Join Date: Mar 2008 Location: Spartanburg SC. Posts: 70 Rep Power: 18	the secondary ports you cant really port a whole lot since the port timing on the closing is already stupid late on them. The primary port you can go fairly large pineapple racing makes about the biggest 6 port template I would do to actually be able to drive it.

07-03-2012, 03:45 PM	#3
Kush47 The Newbie Join Date: Apr 2011 Posts: 11 Rep Power: 0	How about turning the 6 ports into 4 ports by cutting threw the little space between the ports and making it larger??. Has anybody done this before? And would there be better results and more power by doing this?? Thank you

07-04-2012, 08:21 AM	#7
rotarycrazy Rotary Fan in Training Join Date: Mar 2008 Location: Spartanburg SC. Posts: 70 Rep Power: 18	that would be way way too much unless you are boosting the piss out of it and then it will be nothing more than a purpose built drag engine.