Should this be smoothed out more? Is this done correctly? it looks like the diffuser is going to get in the way of air flow? Any comments?

 

You can do the top side too.

 

porting is ok but very sloppy

 

Really? My engine builder is using the mazdatrix templates, so do you think thats not in a standard "street port" or does it change the timing too much?

Otherwise does it look okay?

 

Ahh lemme think about this.. I know what happened. The mazda trix template setup is kinda confusing .. The line you draw from the dowel point across the side of the housing is kinda off the wall. (damn watching detroit hoist the cup) hye template shoudl go the other way, flip it the other way, mark it from the other dowel side. Thats not the correct setup. Not that anything is fuked up .. but I will go out to the garage right now and take some pics... show you what I mean.

be back in a few.

 

I have no idea what you mean and am scared, anxiously awaiting pics!

 

the first pic is of my ported exhaust ... notice the 2 lines I made with a black marker to mark the template/dowel line up. upper and lower line.




The second pic is the correct lineup, notice what line its on.



and the last pic is the way I think you guys lined it up .. porting down only (not the right way) you can see how easy it is to mess up with that template.

 

see, that last pic shows how it ends up ...porting low only, and the other metal jobber seems to get in the way. I don't think you ruined anything ... just don't port anymore down.. and you might want to port upward a bit.


The only reason there is 2 lines drawn on my housing is that I came 3 seconds from porting it that way also .. till I looked back on a few pics that showed it going the other way. lemme see if I can find that pic.

 

I street ported 2 rotaries an the way i do it is by looking at the housing from the outside then removing any alumminun athat prevents a smooth flow around the sleeve. Any more than that and the overlap would be too agreesive for the street. Are u getting the intakes ported too?

 

I just saw those pics and it looks real easy to get it all confused.

 

okay this picture is from mazdatrix FAQ. this is what i noticed just before I ported it the oother way. notice the line-up and on what side of the dowel its on.

 

I see what you mean. What should be done to correct this? What effects will this have on the motor? As in is it screwed? Or does the diffuser sleeve need to be ground out a little to help flow?

 

realy I like to just pull out the difuser and then make the port the same size. JK tell your engine builder to lay off the pipe. ;-)

 

Personal opinion. I don't think your screwed, just lightly port the top, and smooth out the port for sure... I would grind down the defusser a bit to avoid it from stoping a free flow of the exhaust. Not sure... but maybe a degree of timming or 2 adjustment might compensate for that. make sure you round the edges a bit also .. so the seal doesnt catch the lip of the port.

Its really a BS template for the money. I almost did the exact same thing! I just thought it did not look quite right so I went and looked at the FAQ pic's and I noticed what I am pointing out. I think you might be okay though ... I hope to get other opinions before you spend money on the rebuilt kit.

 

one more thing I noticed ... look how they label it. "top" and "bottom" seem to be backwards.. maybee they mean top of the port... maybee its a fug up .. hard to say.

 

I see that. Hmm...anyone else?

 

Hey Rpeck, just for comparison purposes, can take a pic of your housings at the same angle as my original pic? I just want to see how the sleeve looks, because on mine it looks as if the exhaust will go right under the sleeve.

 

here goes. 3 pics. 2 of my ported housing .. 1 pic of a original housing that was chewed up by a apex seal (I replaced it) the grinding on the original housing is from me testing my porting bits. But gives a semi good comparison.

 

awsome, thanks!!

It looks like you had to grind the lip of the exhaust sleeve down also, correct?

 

Ya, thats why im saying I don't think your in bad shape. Just don't grind any lower. And level it all off you should be okay .. then again opinions are like **** holes I wish we had a few more **** holes here tonight . I'm just guessing, and trying to help ... I would love to get a ted'ish opinion on this.

 

ya you will be fine there will be no adverse afect if anything it will help exhaust alittle more.

 

Me too, anyone else?

 

I just have one thing to say, and thats thats i dont know why there templates tell you to go down at all. On my motors i never go down i always go out and up. I had a friend that is very knowledgable tell me that going down causes "the motor to go away" basicall less power. The exception is of course if your turbo. But any ways i dont liket the idea of how much they go down on theirs. Just my opinion, but it is interesting.

CJG

 

If your not in a hurry you can send them to me and I'll finish porting them for free, all I ask is that you pay shipping...

If your going to finish them yourself then you can grind a little off the port sleve, but not too much, it is pretty thin to begin with... you also need to take the sides out on each side about 3mm's and up about 2mm's and they need to taper down to the inner side of the port by the sleve..

also look strait in from the rear of port where the mani bolts up you shuld try to keep the port itself slightly above the port sleve for good flow, the bottom part looks like it is already below the sleve, so try to take a little off the sleve and get the sleve as close to even or a little below the port if you can, but don't take to much off it because it is already pretty thin... I hope you can understand what I'm saying and this helps..

also can you post a pic of the port from the exaust manifold side strait on... Thanks

 

You need a little more practice in control.
It looks like you took off a little too much close to the "port sleeve" (what you call a "diffuser").&nbsp When I port the exhaust port, I try not to touch the inside edge, as this gives the exhaust gases a good "ramp" to clear the leading exhaust sleeve edge.&nbsp These exhaust sleeves are made of stainless steel and don't cut very well.



-Ted