George84

I am looking into getting a street port or a large extend port for more power. Does anyone know how much horsepower I could gain or get up to (my mods are in my signature)? I think I would also get Pinnapple Racing sleaves for my actuators. I drive this car almost daily and I don't want to have problems at idle so I think a large extend port is a big as I should go. How much do most shops charge for doing a good streetable port? How much will it shorten the engine life?

DelSlow

iTrader: (2)

its not worth it. go turbo, and youll make more power for cheaper.

George84

I still want to know about a streetable port

George84

I know there are a few people in this forum have a N/A with a street port of some kind, would you care to help answer my questions?

wozzoom

It's not worth it to tear down a 30K mile engine to do a street port. No way. Never. Especially on an NA!

Labor alone will eat you alive. Expect to pay around $500 and up just for the porting. Add in the cost to pull the motor and the seal kit to re-assemble the motor and you'll easily be into the upper $2000 dollar range. Your real world gain after spending $2000+ will be around 5%.

Street port gains on an NA are very slight. If your looking for power, your only options are nitrous and forced induction. See the N/A supercharger thread for some insight.

As for life of the engine? A good port job will not effect it.

gerbraldy

Labor? If you own an rx7 ,start working on it yourself. Trust me, take apart your first rotary engine and it will be easier everytime after that. Take it apart your self and bring it in to get it ported. It will cost me 220$ to get mine streetported up in tampa, that is if I bring it disasembled.

gerbraldy

Labor? If you own an rx7 ,start working on it yourself. Trust me, take apart your first rotary engine and it will be easier everytime after that. Take it apart your self and bring it in to get it ported. It will cost me 220$ to get mine streetported up in tampa, that is if I bring it disasembled.

gerbraldy

Labor? If you own an rx7 ,start working on it yourself. Trust me, take apart your first rotary engine and it will be easier everytime after that. Take it apart your self and bring it in to get it ported. It will cost me 220$ to get mine streetported up in tampa, that is if I bring it disasembled.

gerbraldy

Labor? If you own an rx7 ,start working on it yourself. Trust me, take apart your first rotary engine and it will be easier everytime after that. Take it apart your self and bring it in to get it ported. It will cost me 220$ to get mine streetported up in tampa, that is if I bring it disasembled.

George84

I have read that a large extend port(50% over stock) can add major power around 70-90 more horsepower.

selanne8

i've got a street ported engine and here's my impression: you do get a little bit more power. how much, i don't know, i haven't dyno'd my car.

but, the whole reason i went with a street port was because my old engine was losing compression, so the difference i felt would also partially be due to pulling the old engine and putting in a new one.

since you've only got 30k on yours, i'd say it's not worth it. wait til your engine is ready to die, then rebuild and port it all at once.

my port job cost me about $250 from pineapple racing and i was told it would not shorten the engine life. i would recomend putting in an s-afc to tune your engine as the port job will cause your car to run rich.

j.ho

wozzoom

Not on this forum you haven't. I’d like to know where you heard that. The only way you'll get that kind of power out of an NA is to go with a peripheral port engine. It would not be streetable.

Even a street port on a turbo engine doesn’t net that kind of gain.

George84

I am at school right now but I will put a few sights where I got some info from on here in a hour or two when I get home. And I am talking about a large extend port which is still vary streetable.

wozzoom

The best street port dyno results for an NA that I've ever seen were still only in the 180-185 RWHP range.

170 is about the best I've ever seen on this forum on a stock block. That's than a 5-7% gain.

Also remember we're just making numbers up here...You're results will vary GREATLY. Condition of your engine, compression, and quality of the port make a huge difference.

George84

The sites I have been getting some info from are http://www.rotaryengineillustrated.c...-ports101.html and http://home.iprimus.com.au/bluey3/portsPage/ports.htm the second site talks about the 12A 4port rotary but still looks like a lot of good info, let me know what you guys think.

wozzoom

That information is fine except it talks about HP not RWHP. A 200 HP engine with a 15% driveline loss will show 170 Rear Wheel HP. (RWHP).

So yes a street port can get you to 200 HP at the engine. Just don't expect much more than 170 at the wheels.

George84

Those sites were talking about the 12A 4 port engine when saying around 200HP(how much HP are they stock) and I also have full exhaust with a intake so I would think I would have a giant leap in performance.

sidenote< this is my 100th post

von

well if you put on a stand alone or carb with a street port you can get over 200rwp easy...

I got 160rwp in a stock port. So im sure streetports will get you 20rwp or more depending on how big you go

von

What are you talking about wazoom many people have had more than 170rwp. Somone on here has 181rwp on stock ports!!! Did you miss that one?

Over 200rwp is deffinatly possible. STock discouraging our young friend here.

von

Haha they are talking about 4port 12A engines lol. Ok they said a mild-normal streetport will make 160Flywheel HP. Ok a S5 N/A already makes 160hp.

Trust me you can make over 200rwp with a streetport on a 13B

E-Warrior

I have a street ported 13B with intake, RB exhaust, and RB headers, and i'm getting close to 230 rwhp.

-TAL-

intake and exhaust doesn't do a hell of alot. 5whp maybe.

MazdaRx7Racer4Life

Its possible, but I think the bang for the buck aspect of it is not worth it. Again, the key words being "I THINK" If you go turbo then streetport it, your gains will be greater and you will be happier, but turbo is not that great for the track (again, I THINK) I feel that a powerful NA ar can be better controlled by manipulating the throttle and not having to ake into consideration the spool or lag of the turbo. Up to you my friend

DerangedHermit

However, I realize many of my customers are not familiar with the operating systems of the RX-7, and are uncomfortable in doing this phase of the teardown. For these persons, I offer my experience by allowing the customer to ship the entire engine in LONG BLOCK form to me, and I will return it as a rebuilt long block with all your original components reinstalled, as well as new vacuum hose where required. All gaskets from the engine rebuild kit will be installed where necessary, and the engine will be ready to drop back into your car. In this case, refer to the engine removal writeup for an idea of how to correctly pull the engine out in long block form.


The additional fee for this service is $150 for any engine up to 91, and $300 for 93-95 engines. Note also that shipping a long block is considerably more expensive in most cases than the short block, as the long block weighs twice as much. Prospective customers in the eastern US should also note that complete removal/installation of your rebuild is available as well, should you choose to bring your car to me and leave it. I require that the car be left a minimum of 2 weeks, possibly more, up to 4 weeks depending on the job and the amount of work in front of you (other customers).

Cost of standard installation (no conversion/fabrication involved, all stock or stock replacement parts) for all cars up to 91 is $600, while 93 95 RX-7s are $800. Note that if you're having me do the installation for me, you do not have to pay the above listed $150 service fee for teardown/reassembly, this is included in the installation fee. Custom installs/conversions such as NA-->turbo and automatic-->5speed are available in some cases as well, however I do not always stock these parts.

Streetporting charges:
84-91 6 port engines, aux. ports only, $200
84-91 6 port engines, all 6 intake ports, $200
87-91 turbo engines, all 4 intake and both exhaust ports, $200
93-95 engines, all 4 intake and both exhaust ports, $200


From www.rotaryresurrection.com (Kevin Landers).

I'm not sure where you got the $2000 from. Unless I'm missing some charges applied to streetporting from Kevin. He can correct me if I'm wrong. I'm seeing $600 for installation in the car itself, and $200 for the streetport. Or, just tearing down, porting, and sending back (excluding shipping) is $150 + the $200 porting. Hell, for $2000 you can port AND rebuild (although that won't be needed).

Pardon me if I'm extremely confused and can't add right (got 2 hrs of sleep). Oh, and I have no idea about the gains. Just thought I'd throw in the info about pricing for the heck of it.

DerangedHermit

https://www.rx7club.com/showthread.p...ting+AND+gains