crpdragracing

Ok Scalliwag, where were you back in the early 70's when the Puerto Ricans were working in their rotaries already for a while? I have seen these guys accomplished something done in their own backyard. Here you have to have a silver table because you don't want to get dirty. Over there they put together, test and retest until they see real results in their own place. You start learning about rotaries not long ago. Give credit to whom deserve it. If I win the lottery, I am personally calling you to take you there and show you what they do with what they have. Do you know that they have cars running in the 8.50's with no electronics or nitrous? Everything invented and aproved by your buddies in NHRA.

Wheather they invent the PP or not, hey give them credit for what they accomplished, which you just came up to play the game. Tell your buddy, the Puerto Rican to e-mail me, I need to set him strait.

Scalliwag

Damn I don't know whether to get mad or laugh That earlier post was said "tongue-in-cheek". I am well aware of the Puerto Rican's accomplishments. Think about it, my business partner is Puerto Rican. Sure he talks funny but everybody outside of Texas says the same thing about me. David has told me every PR rotary story at least 8 times and counting. He knows the porting, tuning, and subtle tricks that come with the years of testing, trial and error. I just know how to make weird **** and throw it at him. Then we get drunk and make fun of each other and we are happy

I am not really sure how much you can teach him because he won the first ever NHRA Import All-Motor in 2000 here in Texas and is friends with the guys that run Ileana as well as every other notable rotary in PR for the last 20 years.
Plus according to him he taught them everything they know HAHA!!!

As far as me not getting dirty? My wife would sure as hell tell you thats not right.
Just because I have not worked on rotaries for 20 years don't mean ****. The GTO's, Firebirds, Chevelle's, etc. that I was building as well as that mini-monster truck phase had me more than prepared for this game. What I have done in the short time has beat the hell out of talking about working on rotaries for 20 years.

So chill out and read that post again from the point of someone that is having a little fun ragging on friends and the inherant confusion that surrounds the creation of some of the modifications. But I will take you up on the trip to PR if the opportunity comes up. The last two times David went I had free tickets (just pay the taxes) because his wife works for Delta but I was not able to go. So be sure to check with me first

ddub

I just went through this thread a little bit ago and I must say I'm very impressed. A peripheral port is a dream of mine one day. Have you or anyone you made these for used them in an engine yet? Any news on how well they help up? They look awesome.

Scalliwag

Well the ones I made went into Ken Scheepers car and did very well. But they were copied from ones he already had so that was to be expected.

d0 Luck

doweling's a good thing to have especially if you have a motor that will spin 10k+ RPM's. my uncle's 4 aggressive streetports, bridged FD, and 1 peripheral motors are all doweled since it sees 10k RPM's. it basically holds the rotors in place/balance if you're spinning it that fast. and yes, these are all for all motor applications running on 51 IDA setups with all that good stuff.

Kim

Man how did I ever miss this thread.
Your thread just saved us alot of money(fucked MFR housings)
Tore apart the race engine in our trackcar, just to find that the housings were screwed.

www.wankelkim.net/rx7/fb

Thanks for being an inspiration source to the rotary community, Scalliwag

Kim

Scalliwag

That is great to hear this helped you guys out Kim. BTW I am scalliwagrx7 on Skype
Let us know how it goes.

speedturn

iTrader: (1)

Kim,

Sorry your housings were in such bad shape in your new car. Those P-Ports are huge!! I love them!!

patman

iTrader: (3)

wow..those are some big *** ports...what the hell is that cracked surface?

pat

Kim

Yeah the MFR ports have been modified a bit, I was told that some Swedish guy build the motor, but I havent found out who it was yet, I really wanna talk to him.

Yeah it sucks about the cracked housing, but life goes on and we dont have 2000$ for a new one, atleast they(there was two more with the spare motor) will make for an exclusive fishtank

One of the spare housings looks like its in great shape but its cracked by the leading sparkplug
I have been playing with the idea of getting it hardchromed and try it out, but with my luck it s a no-go, maybe Scalliwag knows if it will hold up???

paulgrow

Sweet Thread! I've been wanting to do a side draft conversion. Does anyone have a good schematic on how to do that? Thanks, ~paul

patman

iTrader: (3)

throw up a pic of it, im sure someone can make a good guess

Arvika

Sweet, sweet sweet!
Just one little tiny question...
What kind of Devcon is used? They make a lot of different seal and reparing stuff!

Arvika

Nobody whom knows?

rotarygod

iTrader: (1)

Devcon Plastic Steel Epoxy

Arvika

Thank's a lot! :-)

doridori-rx7

iTrader: (3)

as a high temp alternative to Devcon you can use the titanium based liquid metal from locktite that's good to 400F or in our case we use a product called lab Metal it's good to over 1000F works on both int/exh.

slomo85

iTrader: (8)

I have been reviewing this thread for about a week, and great job everyone!

Anywho, only one question. What do you do about the tension bolt hole? Obviously there isn't any room for the bolt now... do you just not put the bolt in?? I remember seeing that someone made a very "strategic" bolt, but forgot where the pics were. I just remember seeind it, and the word "strategic" was used like 10 times. But it was basically a bolt ground into the shape of the tube, so it would fill the tension bolt hole, but... then a tension bolt coulden't go through the hole, which leads me back to question number one. Thanks for any answers...later

peejay

I'm the one who did that.

I don't know about the newer 13B's, or the older 13B's for that matter, but on most later 12A's that tension bolt hole is unused. There isn't one, the boss in the back of the block isn't drilled. I would imagine that series 4's and up are also this way.

The bolt wasn't to plug the hole, the bolt was for something to attach the tube to! You cannot weld steel to aluminum no matter how hard you try.

slomo85

iTrader: (8)

Well I have a 1991 coup na motor I wanted to play with. I'll check if that bolt hole is used or not. And my bad, haha, I went to your site, and sure as ****, that is where I saw that. My bad, hahha...later

peejay

6 port engines *can't* have that tension bolt, since the intake ports on the end housings go right there.

speedturn

iTrader: (1)

On my PP road race motors, I used to get my side housings prepared by the same engine builder who puts in the PP in the rotor housings. Last year, I thought I can do that; anyone can pour some epoxy in the side housings to seal off those old intake ports. I chose the Devcon steel filled epoxy, since the side housings are made of iron. After the usual careful break in period, my PP engine ran strong, winning 2 races and one second place finish, and I was leading a 4th race when it suddenly lost compression on one rotor. During the autopsy, I found that the cause of failure was the steel filled Devcon broke out in large chunks out of one of the intake ports, which wiped out the side seals and that side of that rotor.

I called and asked my PP housing builder, Nick at Rotary Reliability in Santa Anna, CA. Nick has been making his own PP motors over 20 years now; 20 years ago he set a Bonneville Land Speed Record with his own PP motor. Nick said, don't use the steel filled Devcon, use the Aluminum filled Devcon. I am a Mechanical Engineer, and I have been contemplating why aluminum over steel, and the only reason that I can think of is that maybe the aluminum filled Devcon conducts heat better than steel filled Devcon, so it is able to conduct heat out of itself and into the water cooled iron housing better. All I can say for sure is that Nick knows his stuff; my old 12A PP motor that he prepared the housings for lasted over 26 hours, and was still running well when I sold it to another road racer. On my current 13B motor, my Aluminum filled Devcon ports now have about 4 race hours on them (not counting break-in hours,) and I have won two more races with it this summer, beating out the 3 liter Porsches. Hopefully it will last many, many more race hours.

The Devcon to use is marked:
Aluminum Liquid F-2
10720

The Devcon is very expensive. Another tip Nick taught me is that you can use another, cheaper brand of epoxy to fill up to 3/4" from the face of the intake port, and then use the expensive Devcon to fill that last 3/4" that sees the heat of the rotors.

Do not pour the Devcon flush with the face of the side housing. Leave the Devcon at least .040" lower than the face of the side housing. Also remember that the Devcon may expand slightly while curing, so always pour it lower than the face of the side housing.

Maxthe7man

Just reading through this thread and thought I would add a correction , that is not a scoot housing, that is Takashi Aoki from Revolution MC, who pioneered the cross-port engine....max

rotarygod

iTrader: (1)

What's a cross port? Is that just another term for semi peripheral?

Maxthe7man

Yeah just another name for it...