OC_

so if you where trying to get as much top and power out of a stock 6port engine with a custom intake manifold, and you left all the ports 'open' all the time, what would it idle at? lets say you tune for max power at 7000 rpm or somthing.

pengarufoo

My car idles happily @ 750RPM with street porting, no aux ports sleeves/actuators, and TWM 50mm individual throttle bodies, managed by a E6K. I normally idle higher though as I have an underdrive pulley on the crank so the charging system doesnt work well at the lower rpm.

What exactly does my setup result in? All 6 ports open, full-time, and they're significantly larger than stock 6 ports, it's a T2 intermediate street ported, MUCH larger than the stock primaries.

NoPistons4Chris

oh yeah, definitely going with the holley carb would be good with a bridge port. depending on how big your bridge port is will ultimately determine your power, so it's possible your power can range from anywhere to 250-280 horses if you want.

Kim

Man I allmost forgot about this thread.
Anyways I havent gotten a motor yet, and today i got on the dyno and had it tested before we go to Sweden for a trackday.

**** I need more power

Here is the dynosheet, its FWHP
RWHP was 142.something

Kim

Big bump for my old thread.
Since that dynosheet^^^^I have blown the motor, nothing serious though, just an inner water seal/O-Ring.

So I took the engine apart and started porting using 88integraLS´ porting templates.
But I noticed a difference in the aux. ports as american are using sleeves and european spec. is butterflies.

Anyways, to the question : How much farther can I go on these ports??
It feels like I can go up a few millimeters, but Im not sure how far I can go without "hitting" the compression cycle.



Full thread with rebuild
https://www.rx7club.com/showthread.p...5&pagenumber=1

Kim

bumpity bump

88IntegraLS

You could probably go up a millimeter or two on the aux if you wanted. If you have it ported to the top of the aux port template now, you could go up a tad more in my opinion. When my aux ports open up, the car accelerates harder right at 3800 rpm and can pull up to 7500 if I'm in the mood, so your template is about medium / large sized for the aux, and you could go a tad higher without losing too much at 3800 rpm in my opinion. When you add duration it can take away midrange torque sometimes.

The main thing I would do if I was in your shoes would be to bevel up the secondary port and really blend the bowl into a flowing shape. Here is how mine ended up looking.

rotarygod

iTrader: (1)

Those ports are WAY bigger than I port mine and are much larger than I would ever port them. The intake runner is so small that I just don't see a port that large doing any more good. The problem with them stock is not only the small size of the stock port but also the size and shape of the runner. I'm not saying that those won't be better than stock but I just think that there is a point that isn't worth going past and those ports are past it.

Kim

Thanks Jeff
I see that you have gone down a bit on the secondary ports too.

Something must be wrong with my computer, I cant download pictures and stuff

88IntegraLS

Bwahahahahaha.

Just kidding. My philosophy with that port (Kim is using a template of my originals) was to create later closing with a flowing outward shape at the edges. True, the runner is very small inside the aux port sleeves and it has a pin and rotator shaft right in the way of the airflow. I never put a flow bench on the iron nor did I do a fluid mechanics analysis . . I merely went with an idea of how I could go about streamlining the path of airflow out the port.

It seemed to work, but I haven't put my car on a dyno or anything. For what it is worth, my 0-60 time is around 6 seconds and I have stock exhaust.

My88Se

iTrader: (10)

yes this all brings up a good point that Judge ITO has brought up on porting. I highly recommend you take a look at it.

here

Also pinned at the top of that section there are many more informative tips. If you plan on porting you exhaust I suggest you look at that thread as well.

Kim

Thanks man
I have been checking out Judge Ito´s porting threads closely since my project started, I havent found anything on N/A´s though.
But all these small hints and tips are very usefull aswell on N/A and Turbo´s.

I will round off the port in the marked areas.....Click me

Not that I think the sideseals-ends will interfere with my port.

My88Se

iTrader: (10)

i didnt think so either, byut you can never be too safe when it comes to putting together an engine.

Kim

TAADAAAAA Porting is finally done and I seem to be very proud of my effort

Here is the primary port...
Nevermind the green stuff, its moisture guard as I dont have money for apex seals right now.



When porting the primarys you dont have to worry about EGR passages as european models did not have to pass Californian emissions the werent equipped with EGR system


Here is a shot of my secondarys and auxillary ports, the aux. port looks to be on the edge of the oil control ring track but I think Im pretty safe

88IntegraLS

That is freaky, seeing those ports on another person's irons. They look fine and I doubt you are actually in the oil track by much. In fact, it looks like you could go further towards it on the top inside edge of the primary and nose of the aux port. I would recommend smoothing off the inside edge of the primary (straighten the edge a little to get rid of the jog in it) and if you have not done so already, lightly bevel all edges of the ports.

Kim

The primarys has been straightend out.
It aint the best picture but here it is...

88IntegraLS

Sweet, I want to know how it all works out when you get it running eventually.

Kim

I will let you know, hopefully with a videoclip.