micah

Well, this weekend I finally do the porting and start assembly of my engine.... My engine bay is finally painted and its time to put it all back together...
Shameless pictures.......



My primary goal was to just use a template and be done with it..... however, after looking at the popular templates (I bought the racing beat, mazdatrix, pineapple and Kahrens 195rwhp port template). Out of all of them, I like Pineapples primaries and Kahrens secondary/aux ports the best.... Chances are I'll use his secondaries as they are dyno proven 195 with stock ecu/injectors.

Its the primaries I have concerns about... I'm thinking about just leaving them stock, maybe cleaning them up a bit. That way I can retain the low-end, functional 6-port, fuel efficient driving behavior under 4k... then when I romp on it above 4k, I'll get the benefits of the larger secondary/aux ports....

This car is going to be my reliable daily driver, so I'm not going *****-deep with performance... just spirited daily driving. So I don't want to hear answers like "Dude. don't be a ***... BIG PORTS... and put a turbo on it while you are at it!". Hehe. I just don't want to have the adverse effects that people report with large primaries and be kicking myself for it later.

What do you guys think? Has anybody had experience with a car in this config?

Any help is appreciated. Thanks,
Micah

SureShot

Your research is good.
You are right about cleaning up, but not enlarging the primaries to maintain good low end charge velocity.
The pineapple sleeves might be worth checking out.

Opening the exhaust ports a little earlier & wider also helps.
At that point a header helps a lot.

That's a really nice looking paint job.

ourxseven

iTrader: (1)

i just had that done but haven't broekn in the engine yet . Idle is smooth . try a pm to rpm performance . link in sig

micah

Yeah, I know about the exhaust.. The pineapple sleeves are cool and all, but if I go that route, I'm going to tack-weld those bitches in there.. Too many instances where they rattle loose...

Thanks.. I was bored and had paint. Used that 1200deg ceramic rattle-can stuff. Actually goes on really nice. I'm used to HVLP stuff most of the time, so I was actually pleasantly surprised with how evenly it went on. I typically hate rattle can.

The fan was mostly novelty.. I'll probably go e-fan anyways... but it was fun. I doubt the paint will last through the breakin. It'll probably chip off as the blades flex.


I can't wait to get this keg together!!!! Its been sitting and taunting me forever!

micah

Do you have pics of these ports? How extreme were the secondary/aux ported? I want to go as far as I can without breaking the lip between the aux/secondary...

The ports on the left are what I will make mine resemble:

SureShot

I made a rotor template from some clear plastic and marked the corner, side & oil seal positions.
Then I could slide it around on the plate to make sure I wasn't cutting too far in or out.

micah

I'm not to worried about that. Its pretty easy to figure all of that out. My main concern (and the reason for this post) is ******* up my primary ports. I've never actually heard of anybody leaving their primaries alone when doing a "street port". Almost always, street ports are from a template and thats it. I'd like to actually give consideration to practicality. If it doesn't give me any benefit below 4k, why would I make my primaries huge when my secondaries and aux will give me more than enough air above 4k?

Good to decide this **** before I start up the die grinder. hehe.

Meatkibble

Personally, i'm doing the same thing that you are, and i would be interested in hearing how it comes out, and how you do it.(which ports you change, which ones you don't.)

micah

I'll keep this thread posted when I do it... and there will be pictures and all... but the engine won't be running for a good month or so. So, be patient.

micah

Another question... Do you think S5 TII 550cc injectors in place of my secondaries would actually HELP me? In talking with Kahren, he mentioned that the problem with his dyno stopping at 195rwhp was that he was leaning out in the high rpms.. I figured the extra 90cc's would help me out in that area.

Since I've never played with fuel curves, ratios, etc..... I really have no idea. Most of the posts I see say "NA injectors are fine for up to 200hp!" and "Stock ECU can't handle anything higher...". But I figured I'd ask since I already had this thread open.

SureShot

^ Probably yes, but a wideband pull on a dyno will tell for sure.

FWIW: When I ran with an Apexi S-AFC, I noticed that the AFM flap goes to 100% before the revs hit 6K at WOT. Above that the ECU is winging it on its speed/density map.

unW7WZ

Might be worth a try I say, as far as the secondaries go. I have a spare s4 NA keg I was planning on doing the same to.

/subscribe


Keep us posted and good luck with everything. Excellent color and accent choices.

Shainiac

iTrader: (7)

Im am currently going through the same process. I also bought the Pineapple Racing 6PI template and am curious about how huge it makes the primaries. The Pineapple one hardly touches the secondaries and leaves the aux ports untouched. Hopefully I will have my motor together in the next two weeks.

micah

Yeah, the pineapple one has the best primaries I've seen on a 6-pi streetport template.. but IMO still too big.. Their secondaries/aux ports are nearly stock... maybe cleaned up a bit... I would barely call it a street port. maybe a MILD street port.

Thanks SureShot... I'll get a wide-band eventually and let you know how they perform.. but I'll get a set of them just in case... the secondaries are a lot easier to change out.

micah

ALso... does this only apply to S4? Or the S5 AFM as well? I thought that was one of the reasons they switched from the flap style AFM to the cone style.

Kahren

iTrader: (13)

its not just the secondary ports that allowed that motor to go to 195, the primary and the exhaust porting on the 6 port make the most diffrence on the 6 port motor, since there is not much you can uprove upon on the secondary and aux ports

micah

Yeah, 195 wasn't really a number I'm trying to hit... Just trying to keep aspects of your ports.

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/review-my-port-template-667097/

In that thread, I show my porting template that I made based on your ports... on the aux port, it looks like you could open it up a bit more. Am I judging that wrong?

Kahren

iTrader: (13)

yes you could go toward the oil ring a little more on the aux, but i wanted to leave that edge round, and i didnt want to increase the area of the aux port face too much since the runner for aux is not that large. the bigger you make the port the more the air velocity will slow down. i like ot have a balance of things

micah

Actually, I was thinking of going the other way.... toward the corner seal tracak. There's still a good 2-4mm left I could safely grind away past the pictured template border.

Sideways7

iTrader: (7)

FWIW my engine had some pretty good sized primaries and it had good power down low. It was more than enough for city driving, and screamed up top. Down low it had much more punch than before the rebuild and it made usable power past 7k, close to 7500, and this was with s4 rotors and intake. The exhaust was ported as well, in the interest of full disclosure

micah

Your primaries look a lot like the pineapple templates..

I'm not just doing intake. I am doing exhaust as well... I figured that was obvious.

Sideways7

iTrader: (7)

The porting was done by Tito at Alamo Rotary when he rebuilt my engine a few years ago. It had an excellent power band, but I never made it to a dyno.

ziig

iTrader: (1)

i just did a 6 port with my own porting no template ..........I enjoy this car alot now.lots of power with stock injectors and i did go pretty big on secondaries no tube in...also reasonably big on primary..i dont know if i have pics will have to check and see....right now though i havea chiped apex seal and still it runs good above 4000 before that it was good from low down too

rotary84autox

would it be possible to do a bridgeport above the secondarys and incorporate it into the secondary? (ignoring the poor flow of the secondarys with the slleeves) im just wondering if there is enough room on the housing?

micah

If you did it above the secondaries on a 6-port engine, you would be cutting into the aux-port sleeve/runner... However, both of those areas are pulling air from the same intake runner in the manifold.. so I suppose it doesn't really matter if you are running sleeveless anyways. But, for that matter... why not just cut out the gap between the aux/secondaries and make one huge port... people have done that before with success.. You could do a small bridge on the aux port and another half-bridge on the secondary.... but..... I'm not sure how that would affect the flow of the aux ports. Those sleeves can only take so much.. and if you are going to go bridge with no sleeves, again, might as well cut it out.