64mgb

Hey guys (and gals) -



First time rebuilder and I'm planning on doing a street port on my 6 port 13B from an 89-91...I have many questions.



1. Does Judge Ito (or anyone else) have templates for this motor? I've done a lot of reading and searching, and there are many mentions of the Judge Ito templates, but I haven't found a definitive source for them.



2. Do you enlarge all ports? Primary, secondary and auxilliary?



3. What are the best tools to use?



4. Do you have to drill the roll pins in the exhaust port sleeves to remove them?



5. Is it wise to leave these out after enlarging the exhaust port?



6. I'm planning on putting a Racing Beat Holley and intake on this motor...will this setup have actuators for the sleeves in the auxilliary ports, or do you just remove them and run them wide open?



7. Do templates include the runners? If not, what's the best strategy for enlarging these?



8. Is my plan sound? Besides the street port and RB Holley, I'll put on a header and free flow exhaust. Any recommendations for the exhaust? I've seen it stated here (by mazdaspeed7 I think) that the Racing Beat header "produces more noise than HP"...is this true?



Sorry for the multitude of questions. I want to make sure I get this right. I have some spare 12A plates and a 12A rotor housing I can practice on. I've done a lot of reading and a lot of searching, and it's really difficult to piece together all the answers I need, so I hope someone will take the time to help me out here.



Thanks,

Rich

GMON

Check out these 6th ports.

64mgb

I don't see anything...is there supposed to be a picture? I'm using Firefox on Linux so maybe I need to go in and fire up IE on Windows?

C. Ludwig

Dunno about anyone else but Mazdatrix sells 6-port templates. There's not much you can do with the aux ports but the primaries get opened up quite a bit.

CGeek2k

1) dunno



2) for the 6 ports the secondary/aux combo flows pretty well as it is. Mostly just clean up the casting on them. The primary port could use a good bit of porting though.



3) I use a pneumatic die grinder and some 1/4" shaft carbide burrs. For the final cleanup A dremel with some small flap sanders works wonders. Some people use a dremel for all of the porting.



4) I have heard of people welding something on to the end of the roll pin to get it out. I'm not that good of a welder though.



5) dunno



6) Not sure about the intake but I dont think its good to wire the aux ports open.



7) dunno



8) dunno



Hope my small bits of knowledge help

diabolical1

1. I don't know if Ito has those templates, but you should probably PM or call him. I think I read that Mazdatrix sells them, but I don't know if that's true. You can e-mail or call them to confirm.



2. You should, but you MUST BE VERY CAREFUL. It's very easy to cut into the water jacket on these 6-port housings. I've never done a 13B-T, but I have tried a 13B-E and I cut into the water jacket with the primaries. My best advice would be to seek guidance from someone with experience on porting 6-ports.



3. I've used my Dremel and drill for every port job I've ever done. You could also use a die grinder if you have good compressor.



4. I don't know.



5. I don't know, but I would leave it out if it got to be too much of a pain. Actually, I'm thinking of just getting some TII rotor housings whenever I get around to trying another 6-port.



6. I don't think the RB/Holley manifold will actuate 5 and 6, but you could e-mail or call Brian at Racing Beat - he answers all of the questions I have.



7. No they don't have a template for the runner (at least RB doesn't). I'd say just be reasonable (meaning, don't be greedy and don't just say bigger is better!) Think of damage what can be damaged if you don't leave enough material. Also consider the fact that you're not running a turbo.



8. I believe the RB header to be the best out there. The only other header I've ever tried in 18 years was Rotary Engineering, but they no longer exist. I guess my opinion may be biased, but they've never let me down. In fact I believe you'd be well served by using a complete exhaust from RB for all but the most hardcore N/A (pronounced: not streetable)applications. Obviously this is just my opinion, not an indisputable fact ...

GMON

drg

GMON

I have no idea how that one on the left got there. Its a bug in the board.

GMON

sdf

64mgb

Thanks for the pics. That auxilliary port looks huge. Sorry for my ignorance, but what do drg and sdf mean?