well im testing the waters right now. im very interested in trying to build a 3 rotor out of 2 rotor parts. has anyone on this forum tried it before? any places where i can source a 20b e shaft or have one made? any info on parts and issues would be great. https://www.nopistons.com/forums/pub...IR#>/wacko.png

Waste of time...

For less money, you can get your own 20B with trans.





-Ted

well lets discuss it what is it that makes the conversion so expensive?

The cost to have a low tech 20B E-shaft machined is about half of what you would pay for a complete, low mileage 20B.

how about a used 20b eshaft?. isnt there a place in ausie that will make u one?

come on guys. lets get creative here.

Guru in Austrailia makes aftermarket e-shafts for 20Bs www.rotorsportsracing.com sells them..





would still be cheaper to buy a low milage 20B than to try to frankenstein one.

Sort of like re-inventing the wheel, the origional seems to work just fine, why complicate things?

im not trying to reinvent the wheel here guys im just trying new things(for me). i think it would be fun to try. i have 2 completely dismantled 13bt engines. and a million extra parts around my shop and i wanted to try. i mean how hard is it really to put one of these things together out of stock parts?

Well, I'd give you high marks for wanting to learn abouth this stuff. An A for effort and all that. Keep at it. https://www.nopistons.com/forums/pub...DIR#>/wink.png

thanx man. i know this topic has prolly been done to death but ive been trying to look up some solid info on this and i cant seem to find anything. i think we should all put any info we have into a faq or something. hell u never know some one might come out with a 2 rotor to 3 rotor kit from the info provided. then there will been a fleet of 3 rotor rx7s invading the globe and i will rule the world!!!! hahahahahahahaha!!!(insert evil cackle here.)

I was quoted about $6000 for the extra custom components required to put together a 3 rotor from 2 rotor peices.



unless you have a REALLy good reason for it, it's certainly cheaper to buy an existing 20b motor.

Well, the reason it's easier to buy a used 20B is because if you try and put 2 13B's together you run into the problem of using 2 center housings. which means the center rotor will have a smaller secondary intake. That creates some balancing issues with the center rotor not making as much power as the other to due to the lack of fuel and air that the other two rotors will get.



Also you would have to make a custom front housing to accomidate the extra bolts that would be needed to help hold the engine together. On the 20B there are many essential bolts that go from the front and bolt into the center housing. You would have a lot of machine work to do to get the bolt holes made in the center housing and front housing. Plus you would have to make some custom bolts to bolt it in since these bolts will be used to torque the engine down you need to make sure there are the right size in length.



Now lets talk about custom oil pan, intake manifold, exhaust manifold, engine mounts, oil pickup tube, and don't forget the all important e-shaft that has to be machined to exact precision.



I'm sure I've left out a bunch but that should be enough to swade someone to forget about trying to mate 2 13b's together. Not to say it can't be done, but why would you want to?



UsfDr

Isn't that custom 3 rotor e-shaft like $1,000???

That doesn't even include the two engines you need to make the 3 rotor.

I think that easily beats a used 20B right there...





-Ted

exactly, its not a matter of being creative, its a matter of the jdm 20b being less money then ANY other option. i looked before i did mine.

I looked into it for my 86... There is a guy in au that makes 3 rotor & 4 rotor conversions based on 13b parts. The problem I had was that it was about us$6000 plus shipping for a 3 rotor conversion parts only, and about us$10000 for a four rotor. I am still looking for a way to make a 4 rotor, but right now I am SOL. the 20b option, while it is not as powerful as a 13b conversion (aka 13j I think) it is by far cheaper (us$3000 shipped), and all of the brackets, etc are easy to get. If you wanted to do this yourself, look for pictures of the 13j. I will try to find some that I have around.



pritty much the "only" additional parts you need are an extra 13b, a custom eshaft, a custom center plate, 1.5 rebuild kits and extra long bolts to bolt the whole thing together.

does anyone know of a place in the US that may have the 3-rotor 13B eccentric shaft? I have a torn apart 88 N/A, with half a good engine and a full rebuild kit.



And did any of you ever need the "tubular dowel puller"? My dowels came out with no problem. Just pulled up. For the front rotor, I just used a large steering wheel puller bolt and pulled up.



Thanks,

Tosh

the tension bolts for the front rotor go forward. the rear 2 rotors use a normal length tension bolt, although for the 20b they are thicker.

Man, you guys are smoking crack...

Your theory if so skewed from reality, I dunno what to say... :(





-Ted

Well then Ted, allow me to fill in the blanks...



I'm selling crack, along with parts to build a 20B from 13B shitheap parts!

With any luck the crack will have you running down the street with you hair on fire before any of you actually attempt to waste your cash on this silly conversion idea.



For help with crack addiction please call (503)317-2616, operators are standing by... https://www.nopistons.com/forums/pub...1047683664.gif

i called that # but no one answered...

You lie, I would know if you called it... https://www.nopistons.com/forums/pub...DIR#>/wink.png