Right, but as the "choke point" of the port window is enlarged we're back to needing a properly matched port runner. I'm gonna play with "resizing" the primary port entrances on the intermediate plate (stock port motor) as a starting point, ala an old conversation you and I had on using an insert to match the manifold better.

 

I don't believe you will physically be able to *get* to that point, unless maybe you have a J-bridge.

Look at the port area on a 300+ HP peripheral port engine, then look at how much area combined is in the two port runners, then get back to me. You'll find they are about the same.

 

What I said was my dad's ports are close to RB's ones, Maybe a little bigger

 

on the normally aspirated engine with the intake manifold ported no low end was lost (some gain), midrange and upper range definite improvement (big gain).

on turbo motor gain in the mid and high. low rpm no loss of hp (how low is low?)don't be afraid to port big. if you don't port big now you will just want to do it later. port big or you will regret it. on the INTAKE. too big on the exhaust and you will have zero low end and mid range.

on turbo exhaust applications i just remove the top lip,and make it open earlier. you don't need to make the exhaust close later on turbo. you don't want too much overlap.

 

ok, I've been looking aroudn for quite awhile, and not finding much...

Who has some links to soem good 6port n/a specific porting info?

 

You may well be right, thats why I said matched not bigger. My early flow testing of the side plates ports (stock) were disappointing to say the least. I'm still very much in the testing stages to make all this work and play nicely together.

 

I'd call the Racing Beat templates as mild also.&nbsp I've run much larger street ports on my car, and they are much larger than the Racing Beat templates.&nbsp The hard part about the 13BT's in the FC's is that the water jacket is so close - check Mazdatrix website in their FAQ section for pics.



-Ted

 

Okay. It's been determained that the Streetport on my 13BT are larger than RB's...What Idle am I to expect? B'c I find 1200 rpms @ Idle alittle hard to agree with.

 

We've run some pretty crazy ports and none have really affected idle that much.&nbsp I wouldn't worry about it.


-Ted

 

all the street ports i have done idle quite easily around 800rpm+.

 

Well where can I get a large streetport template? I can get ahold of RB ones, but I want larger than a "mild" port job.

 

you don't need a large street port template. you just use the rb template and carefully make it close as late as you can. i honestly use my pinky finger to feel behuind the port and see where i am.

 

A pic of my Streetport. Does this help?


Exhaust Ports were ported too but not displayed all that well In this pic.

 

can you get a clearer pic of the in take , it look kind of small. it the dark black a shadow or permanent marker.

 

It Is a black marker outline that the porting will grind out. Kinda like a visual template. I'll see about getting another pic...

 

silver rotor, did you trace a template or did you do that freehand?

 

template


-Ted

 

mild exhaust port - engine is only supposed to see 300hp.&nbsp I have people already ragging me how come so small!&nbsp Too early of a port opening and the torque drops quickly - I've seen it with my own engine.


-Ted

 

It was done with a modified Racing Beat template. Can-Saf style! www.can-saf.com

 

OHHH Yes Mr. Koseki I like your PORK CHOP, Shell we tell them after the JB weld port wal facial secret too I drove Ted port job. Runs good and to my surprise idles really smooth too. How ever I can not see you get more than 18 mpg on high way with that closing timing. NA is much more sensivetive to port changes. Too late closing mpg and low rpm response willl go to ****, too early opening or too much over lap will need free flow exhaust or turbo which most people will neglect. Port timing is the key more then size.

 

Oh Ted I just build a motor for Warren's 88 TII and today he ran 12.4 @ 121 MPH with street tires and Gabs. I was suprised too. I did not go crazy on the port like you.

 

Wow, nice mph!

Damn, and I thought I could keep it a secret!


-Ted

 

That is a nice looking port. Now that I looked at it, makes me wonder if I messed mine up. Because on mine I didnt just curve the very edge of it out a little, I took the whole buttom part of the whole and angled it down a little bit... i was thinking it would get more flow that way... would that work or did I just screw 2 good housings up?

 

Over porting can cause loads of problems.
Trust me i know! On my previous experiment,the port timing was so much ,the engine couldnt start with the starter,it wasnt turning it fast enough.(the compression was 95 per rotor face,all of them within 1 psi off eachother)

On the exhaust porting part, RETed has a very nice port.It doesnt open or close quicklly ,and the results should be excellent.

Net Seven : Sounds to me like your going to have alott of timing..i wouldnt expect torque to be at low rpm