79+80_rx-7

Well,
I want my 79 to be ported but I have to keep it emmisions leagal, but want the most powerband I can get out of it. I will probably use stock intake and carb (unless I run across a cookie jar filled with money AND has my name on it, but its very unlikly over here in the poor side of town ) . But the exaust is getting a 2 1/2 inch header and high flow cat and a high flow muffler . So I want to know the best way to port it and if I should use a street port, or a big street port or someone have a "custom port" for the most power band. Any other modifications i can do using my friends machine shop that is also filled with air tools . Thanks again for all the help the more the marier. Also any body have templates?? I would greatly appreciate any help Well laterz,
Andrew
Creeping slowly back to my corner filled with no knoledge of the rotary. well some (I can takem apart and cleanem) just not enough to build a sweet rx LATERZ

Winnipeg85GSL

Personally, if it were me and I wasn't changing the intake, I wouldn't port it. To maximize the power from porting you need an intake, just ask jimmy his car is ported but no intake, and it severly lacks performance. Save your money from the porting and get a carb, you get an increase.

79+80_rx-7

I might run into my cookie jar and buy one so I would like to port it just incase. All I need is templates and some bad housing to practice on LATERZ,
Andrew

jimmyv13

Yep my ported 12A is **** with the stock carb. I got the exhaust, now I need the carb to match.

Rotortuner

I ported my 13b 4 port and i run a stock carb and thermal reactor(due to lack of $$) and I noticeed a difference in how hard it pull but i think the exhauset is a big factor. there is however a lot of hp to be made with a ported motor, good exhaust header streight pipes etc, and say a carb like yaw. I think you could get 160-180 or so to the wheels with all that and a good port in it. thats good for 1.2 liter NA.

CJG

FuLLsMoKe

I think once you port it, your 7 will no longer be able to be street legal... Besides--once you port it, you will need to get rid of the cat for the maximum powerband, else I believe that the engine will burn right through the cat.

jimmyv13

Completely untrue. My car would be fully smog legal if I wanted it to be. A ported motor will be legal with a header and a high flow cat along with the existing smog equipment.

mar3

iTrader: (8)

Thank you for restoring my faith in this forum, jimmyv13. This is from a "been there, doing that" perspective. If you're in DFW, then take it to Rotary Performance in Garland and have them do the basic rebuild with a very healthy streetport. Do it now so you can optimize this 12A later without having to pull the engine again. Everything you do after this point can be done with the engine in the car and at your leisure. You WILL notice the power difference even with a stock carb, big cat and exhaust. It's because of the exhaust. The stock carb is jetted rich for the thermal reactor, so it will be almost right-on for the increase in breathing ability the 12A will have with the big exhaust, especially because you're dumping the thermal reactor. It will, however, limit you to about 120-130 horsepower unless you upgrade the ignition. Even then, you'll top out around 140-145 as long as you have the restricting stock Nikki carb. Have the crew at RP do the exhaust, too, if you want a clean factory-like install. They put a switching system on the carb that uses a modded ACV to port air into the cat (you are using a 3-way cat, right? You better get one, if not...) below 2500 RPM that guarantees you'll pass emissions at our current standards. My fresh engine from their shop posted HC's in the 30-40 range with all of the numbers being similarly low. I couldn't get the car inspected at RP because they're in a different county, so I had the inspection done here in Arlington. Because it didn't have a cat to begin with (make sure the non-cat sticker is still on the hood if the emission guy wants to argue.) the new Random Tech cat was considered OK and the guy was astounded at the low numbers. Since then a generic $86 replacement cat has been put in there but no exhaust shop I've been to has been able to replicate the clean work done originally at Rotary Performance. The cat, unfortunately, will last only 2 years at most. There's just too much heat to deal with.

FuLLsMoKe

I said "I think"

That is what I heard from others...

mar3

iTrader: (8)

Sorry for the chop FS, if you took it that way.......the Random Tech cat is made to flow for 455 cid motors, so it's definitely NOT a flow impediment in the rotary application even if the engine has been bridgeported.

FuLLsMoKe

Wow, they make cats that flow that high? (I'm from AL, and with no one to check smog laws... I don't care much about cats )

mar3

iTrader: (8)

I dream of the day in the year 2005 when my car no longer has to be put on the sniffer, you lucky dog...you can bet that cat is hitting the dumpster in 2004 after it's final inspection. By then, I'm hoping enough people have wrecked their RX-8's so I can do a renesis transplant. With some intake and exhaust, should have 310 on the motor with a 100 shot NOS to keep the 'vettes in back!