Very interesting thread. I did my first rebuild/streetport on my son's NA 13b last January. I made my own templates and did the work myself. I followed Mazdatrix's porting info pretty faithfully however I removed my sleeves and rods and filled the last portion on the sleeve port with epoxy to round and smooth the transition. This idea is from the Atkin's Rotary Rebuild Video. Excellent Video---"must have". Car was a bit less drivable but totally acceptable for a daily driver. Best 1/4 time was 14.6. Engine is apart now due to blown coolant seal ( overheated due to waterpump failure--not faulty assembly). Atkin's epoxy trick still lookes el-perfecto after 5000 daily miles and 30+ quarter mile runs. Anyway I have a tip for the seal/assembly problem. Put your seals in the housing, lay a flat piece of wood or metal over the seated seals, and pop in the freezer! I do this routinely when I rebuild automatic transmissions and it works great. You will have to determine how long to freeze the part, depending on your set-up. When you remove the part the seal will behave itself for awhile to provide you with plenty of assembly time. Don't stretch those puppys though, they are high-dollar for a reason and come in a predetermined size. Hope this helps!

 

Dont try that, it doesnt work. OEM mazda ones are the way to go. I built my motor with the teflon coolant seals, and didnt have any major problems, but its too easly to tell if theres any problems. My motor is going in tomorrow.

Good luck.

 

Yes, Mazda OEM is the only way to go.

 

Thanks for the tip, and keep me posted on your SP engine Adam.

 

Im waiting on the oil filler neck to be welded, so it may be fri or sat before the motor goes in. And I still need to decide which front cover to use, and put that on tonight.

 

what tools do you use for the porting?? a die grinder or something?

 

between all the threads ive read here and on nopistons the best porting tools would have to be a dremel and some carbide bits. i just picked up 2 bits at a wooping 9.25 apeace from home depot, but they do cut the the housings Much faster than any stone i have tried, and they dont seem to get dull

Now ive got a question, can you port slightly into the corner seal track aslong as you dont port though all of it? I was practicing porting my first housing today and the new carbide bits cut so much quicker than the sontes i had that i widened the port more than i realized. It doesnt go all the way though the corner seal track, but possibly as much as 1/3 from what i can tell in the wear tracks

 

Carbide bits are the best thing to happen to porting.

On the corner seal track, there should be 3 lines the define where the corner seal runs. You can port to the center line from either side, but not both. For a street port, I go from the port side to the middle line. For a bridge, I take the main port to the first line, and then make the bridge from the center line out. Thats the most you can safely cut into the corner seal track. But I still recommend you be very careful if you go that far.

 

A slight update on my situation. . .

My replacement O rings arrived today. I decided to give the teflon O rings one last try before resigning to the OEM approach of rubber seals. $44 and four days later I had a box containing the missing link to my second try at engine assembly on my doorstep.

Thanks to Reted for the tip on where to get them. Mcmaster.com part # 9319k239, teflon encapsulated silicone O rings AS568A Dash # 175 and about ten bucks apiece.

 

My motor is going in tomorrow. I cant wait.

 

Man I wish you and I were were in the same state at least. I'd love to see your car and check out your work. We rotor builders need to have some kind of get together some time in the future.

 

dose some one have pics of a bp 6 port motor?

 

close enough?

 

ok thanks. that is JUST what i wanted.

 

You considering a motor like that?

 

Can I join too???
I guess that it was the right time that i got those portingtemplates, Jeff.
Yesterday my motor gave up on me, It didnt sound like an digested apex, just a slow and painfull death loosing compression just like that*snaps fingers*

 

I'm considering a motor like that , but its goin in my 1900 lb. Ghia

 

ya, maybe even a half bridge on the primaries.

 

Of course!

Now you can start building your dream. Maybe you can borrow a messed up iron from Higgi to practice on. That is probably what helped me the most- practicing a couple ports before doing the final work.

 

I'm 14, and i just ported an intake manifold, tb, anddynamic chambers. I ported them pretty big, and polished them good. I'll post a new thread eentually, when I get my digi fixed

 

Im most likely picking up a low milage motor at EuroRotor in Holland which is around 1000$ then port the blown one that I have, maybe just maybe Ill go for a carbureted 13B

 

Hey 88IntegraLS sorry to hear about the setback. .. cant wait to see some pics of the work all done. Do you have any more plans for the car? Meaning anymore amazing write ups for us guys to drool over?

 

I'll probably show how to make a fiberglass air box for a cone filter, because I need to make a sealed chamber for my bumper duct to feed to. I am planning in installing a cheap vacuum / boost gauge to be able to determine any difference in manifold pressure at wide open throttle, say, with the car at a standstill vs. 70 mph, etc. It should be a fun experiment.

I got my new coolant seals from Mcmaster-Carr installed today and they fit perfectly. I don't know what was wrong with the ones Rotary Aviation sent me but they just didn't fit at all. The ones I bought from the part # I posted above were trouble free. They were basically the same thing as the Rotary Aviation ones - a cord of pink silicone with a clear teflon jacket surrounding it. Hopefully I will get the machine running again tonight, so I can report back on what the new ports feel like from the cockpit.

 

Mines running!!! Started up first try, started right up. Compression tested at 85 PSI all around after only 2 miles on the motor. Everything is GREAT.

 

oww good job adam.

Just got miine running last week. Even though I ported her pretty good, I now regret not going with a bridge on the auxs. Oh well now I have something to look forward to in the future.

And yes. We all need to meet somewhere in the future. I say we make the trek to oregon. That would be one hell of a nice drive from chicago.