thinkin of a new project....

[Master Shake]

i'm thinking about buyin a little miata and i was wondering if the rx-7 20b swap would be able to drop into it. anyone know if this will work without any major cutting?

[Spektrewing386]

idk, but that would be SWEET. but a 20b only came in like 1 mazda car and i think its in japan. 13b is what was in rx-7s
a 13b turbo might be more reasonable though, can still get pretty damn good numbers. FD rx7s had 13b which made 217hp stock. the FC engines (probably more common and had like 185hp.

http://www.rotarymiata.com/

[cdhtang]

Is this a track car or show car? If it is a track car, I think you should go with another route, rotary are very expensive to maintain.

[Master Shake]

Is this a track car or show car? If it is a track car, I think you should go with another route, rotary are very expensive to maintain.neither. i won't be upgrading anything. just want to do the swap and let it ride. just to say that i did it.
i have a civic now that i use as my DD. i guess you can say it'll be a show car cause i dont' want to drive it much. just somethign i can take out every now and then.

[chituntang]

Do it with the Mustang V8.

[dorin48]

Fundamentals are the same but I don't know how much of a length difference there is having that extra rotor. The 20b was available in the jdm 929 btw.

[speedminded]

i'm thinking about buyin a little miata and i was wondering if the rx-7 20b swap would be able to drop into it. anyone know if this will work without any major cutting?20b? lol, it only came in the Eunos Cosmo...it is based on the 13b-rew from the RX-7 though.

[allmotoronly]

20b? lol, it only came in the Eunos Cosmo...it is based on the 13b-rew from the RX-7 though.

yea its a 3 rotor design based on the 13B, but it has a 2 piece e-shaft though. All in all, it will make about the same HP in the end, but a little more torque. I say just go with the 13B and call it a day.

[Einstein]

Just so you know. As much as I have read about the 20b swap, there is nothing drop-in about it. Expect upwards of 6 grand for a mild swap. And that's being conservative. 4 for the motor and then the fabrication begins.

**edit** I was wrong about that estimate. Go here (http://www.rx7club.com/showthread.php?t=59544).

[Einstein]

Oh and think about this part of it. 2 rotors to 3 rotors. 50% more motor. Where are you going to position it? Align the rear of the 20b at the point where the 13b was? That adds the 50% more motor weight in front of the front axle line - Bad. Align to the front? Have fun with the firewall... and not to mention moving the trans back approximately 6 inches.

[chituntang]

Oh and think about this part of it. 2 rotors to 3 rotors. 50% more motor. Where are you going to position it? Align the rear of the 20b at the point where the 13b was? That adds the 50% more motor weight in front of the front axle line - Bad. Align to the front? Have fun with the firewall... and not to mention moving the trans back approximately 6 inches.

Come on!!! Rotary engine is so light that extra rotory is not going to throw the balance of anyways. And 2 rotors to 3 rotors means 50% more motor?? I really do not know much about rotory engines, but the math is just not doing for me...

[speedminded]

Come on!!! Rotary engine is so light that extra rotory is not going to throw the balance of anyways. And 2 rotors to 3 rotors means 50% more motor?? I really do not know much about rotory engines, but the math is just not doing for me...Yes, 50% more engine. Don't argue with someone that comprehends the concept of basic math.

Half of two is one right? 2+1 = 3 ...Three is 50% more than two.

PS: Four is 100% more than two. Halfway (aka 50%) between two and four is three making three 50% more than two.