I have a 1st gen RX-7 which is undergoing a killer modernizing redesign and hotrod project. I have nearly finished the designs for the frame, body, and interior modifications but I am still looking to a powerhouse setup that would show off my engineering prowess with a one of a kind rotary that meets many different expectations. I want to design a 12A Renesis port using peices of a 13B Renesis, and the original 12A that sits in the car. It is my impression that all rotaries are virtually identical when you look at them straight on, so it is the width of the rotors and their housings plus the porting that determins the engine's displacement and power outputs. Perhaps if I took the end peices and porthousings from a 13B Renesis, machined down the rotorhousings from it to match the 12A's housing width, added the 12A's rotors with 3mm apex seals, used the 12A's eccentric shaft, and slapped an aftermarket 13B turbo onto it with specially made custom exhaust manifolds and the turbo modded Renesis fuel injection, plus oil cooler and huge radiator, my 12A Renesis Turbo might produce around 300hp to match the car's estimated curb weight of 2000lbs (weight reduced of course) for a nice healthy power to wieght ratio and a light, modern 1st gen RX7 to harness it. 6spd tranny and an aftermarket LS diff would also accompany it. Do you guys think this is a feasable project? please give me feedback on any problems I might not have listed about here that you can think of, and then I might just build it!!!!

 

Well, your going to run into the problem that they moved the side seals more twards the edge on the renn, thus on the plates they moved the intake ports out about 20% for more volume and an ealier opening. If you use 12a rotors with the side seals in the normal position, the leading edge of the side seal will crash into the top of the port. This is similar to a wild streetport with a very early opening and just enough side plate to support the corner seal. you will have to radius and polish the top of the port so that the side seals will last. Im not sure if the renn exhaust is also ported this way, but if it is you may have problems with the side seals there aswell. Another porblem (maybe bonus who knows) is your going to have 3 exhaust ports per rotor for a total of 6,.. also none of the renn intake manifolds will fit because the 12a is shorter, so youll need custom ones. Overall id say itd be cheaper and easier to just get a renn and turbno charge it...

 

Might be better to just get a renesis, put lower compression rotors and ceramic seals, and turbo charge it. Then you could pull much higher horsepower numbers and have alot less engineering headaches. I promise that everybody would be very impressed with the motor setup. Actually, more than impressed. You would be my idle!

 

You're smoking crack.



-Ted

 

lol, I just wanted something really unique, but it does sound like it may be too much to warrant actually undertaking the feat-anymore input would be appreciated though.

 

Just put a 13BT in there.

 

 

6 speed trannys are a waste of time and money.

 

if you had prowess you would have already known how to do this..........

 

Go 20b. With a single turbo setup. Bwahaha. Hell, a 20b alone would be kick ***.

 

crap I swear, rotaries bring out the most starry-eyed engineers with crazy ideas. My buddy is like the smartest engineer I know and wanted to diesel a rotary, and do all sorts of other ideas..

 

Yeah same with my buddy, I remember back when we were in high school he was brainstorming a turbo deisel rotary, with few other unotherodox modifications, one of which was detonation pressure releasing spark plugs.

 

I meant that I wanted to create a new original idea, and actually build it by designing custom peices and making the idea work. By the looks of your little overview of your car, all you know how to do is drop thousands of dollars into your car and say you did the work when actually the engineers that you bought the items from actually spent the hard earned time to create these peices for your beloved car. So then in actuality your car has no more engineering done to it by you than when you bought it, where as mine is taking shape in a way that no one else's ever will because I have designed it one of a kind in AutoCAD2000 and 3D Studio Visio, computer engineering programs you could buy, but never understand.

 

Now a turbo deisel rotary, that sounds awesome, never thought of that idea specifically before...genious!!!

 

You have a twisted idea of how most of the world works.
The majority of consumers actually pay someone else to do most (if not all) of the R&D - this is how the world works.

How you are attacking this project is done by very FEW people.

Don't be trying to push your experience with specific software...
I know a lot of people (and I bet there are lots of individuals on here) that'll make you look very stupid with **** you don't know either - i.e. ProE, which is the industry standard and puts both of your abovementioned modeling software to shame.

Drop the attitude and just build your project.
You are always going to get criticism from the peanut gallery, cause we come across posts like yours almost daily - very few execute their pipe dreams.


-Ted

 

I completely agree with you in that is how most automotive apps work, and I have no doubt there are guys out there who could blow me away, I am simply defending the fact that it was an idea, and I think that I can make it happen. Simply an invitation for other ideas and comments, not the onslaught of some unhappy criticist.

 

I dont want this to be a negative atmosphere, so I also apologize for anything I may have said offensively before. Sometimes I become caught up in the competitive aspect, and lose track of the real spirit.

 

exactly Ted!

look doubleohsmurf, all im trying to get at is that if you have to come on to this furom to ask how to do something as complicated as your "12Arensis" then you both dont understand the complications and implications of such a project nor do you even know where to look. how bout you dig up the SAE papers and international patent filings on the renesis so you can get the detailed information you will need to even begin to pull such a project off. or at least fork out the $$$ for a junked rx-8 and pull the engine appart and start making your plans. if you dont already have the commitment and money to do either of those then your post on here amounts to nothing more than smack talk and pipe dreams.

and dont act like you are the only one who knows how to use cad on this forum. ive taken an entire semester of proE and am a member (at least casualy) of SAE at UF. and unlike you, that experince has shown me just how complicated and difficult doing something like a "12Arenesis" properly would realy be, so i understand it is not to be undertaken by some punk whos didled around on autocad for a bit and hasent even seen the insides of either of these engines.

just build it and prove us all wrong, but in the mean time dont expect us to hold your hand through it.

oh and in my sig its 130k MILES, not dollars. dumbass.

 

lol, ok: and btw i dont doodle on CAD, I have been using it in school and on the job for 5 years now. I understand completely its complexity, but I dont have rotary blueprints on it, so I have been mapping it and creating my own wherever needed. Trust me its not easy, but at least I have someting to say for it... and another thing, I stepped up and apologized, so I hope you can be man enough, or woman enough to do the same since you insisted on keeping this attitude up.

 

thats becuse they have so much potential, you have to be like a MIT graduate to be able to make any new fantastic ideas for a piston engine, it's all been done before on a piston.

 

ok, ill appologize, but only because its not my nature to leave people with a grudge against me. i didnt think my original comment was all that inflamitory but apperently you did, so i fired back.

more power to you if you can pull it off. i know its beyond my means (both technicaly and financialy) and at least 99% of the people on here. but i still maintain that if you had to come in here and ask you are in over your head......

all bickering aside, you do relize that 5 exhaust ports is BAD for pushing a turbo, let alone 2. i mean the velocity will be realy low, take forever and a half to spool.

 

thanks man, and to be serious I have only had access to the renesis and the 12a parts come from one of my 2 first gens, I still have to buy an 8 or a renn to actually break down for the build. I'm still 20, and in the airforce so i dont have all the time either, so If I actually get to do it in the near future, I will keep you posted. no hard feelings, i just jumped the gun.

 

new mazda owner never owned a mazda just bought an 82 would like help on where to get started

 

go make friends with the machine shop on your base, a case of brew goes a long ways when yur operating a end mill, or machine lathe! that will save a bundle on the cash side, and allow experts to do there portion of the job. Seriously when I got on board my current duty station, I went to the machine shops and started hobnobbing with the local national workers. bingo I now get whatever flanges I want for my various (not quite as radical as yours) projects made for free. the local Auto Hobby shop at the MWR has the Mig welder, and pipe bender (here anyways) and now whenever I want to try a new turbo on my cosmo, or a new manifold design I just have at it cheap!

Make some friends in those areas, half of them are bored working on milspec bullshit, and would like something creative to do on their lunchhours. makes for cheaper projects.....
kenn_chan

 

you mean, a case of brew goes a long ways AFTER youre DONE operating a lathe. if he drinks the case of brew while operating the lathe, go find another machinist.
lol