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Old 07-10-2005, 06:38 AM   #1
Guns_10
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rx-7

hey i have a 1994 rx-7 twin turbo.. my engine just blew for the first time but i have heard that after they go bad, they just get worse. i was thinking about putting a sr20det engine into my baby. how much do you think this project might set me back? and what exactaly am i gonna have to do? because the sr20 weighs a little less but is slightly a bigger engine..
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Old 07-10-2005, 06:47 AM   #2
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Yeah i know a guy that went through 3 wankels. DO NOT DROP IN AN SR20!! You can get SO much more power per liter from a rotary. You can import a special i think 2.0 liter rotary from japan that comes in some minivan there or something. Its what the hard core rx7 owners do. I suggest you look into that
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Old 07-10-2005, 07:35 AM   #3
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Go to rx7club asap.
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Old 07-10-2005, 09:24 AM   #4
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Quote:
Originally Posted by TurboLag
Yeah i know a guy that went through 3 wankels. DO NOT DROP IN AN SR20!! You can get SO much more power per liter from a rotary. You can import a special i think 2.0 liter rotary from japan that comes in some minivan there or something. Its what the hard core rx7 owners do. I suggest you look into that

I have seen an SR20 engine swap before and they work quite well but as turbo said there's no real point in swaping out the rotary for the SR. If money is no problem then how about a 20B (triple rotary) engine swap? Many of the fastest rotary drag cars use this engine.
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Old 07-10-2005, 03:34 PM   #5
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Quote:
Originally Posted by Guns_10
hey i have a 1994 rx-7 twin turbo.. my engine just blew for the first time but i have heard that after they go bad, they just get worse. i was thinking about putting a sr20det engine into my baby. how much do you think this project might set me back? and what exactaly am i gonna have to do? because the sr20 weighs a little less but is slightly a bigger engine..

Shoot for anm LS1, you gain zero weight and have a nice stock 305-350hp.
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Old 07-10-2005, 04:04 PM   #6
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Quote:
Originally Posted by thunderbird1100
Shoot for anm LS1, you gain zero weight and have a nice stock 305-350hp.
If hes going to do that, he should just drop in a 390, or 302.

But my first choice would be to put another rotary engine into it.
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Old 07-10-2005, 06:28 PM   #7
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i think the one from japan is called the 3rotor or the 20b, thats the one u should put in
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Old 07-10-2005, 08:11 PM   #8
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Ok, just so you know it is called the 20b and it was put into two different cars the HB cosmo:
http://mrec.rotary.net.nz/brochures/.../hb_cosmo4.jpg
and the JC cosmo:
http://www.dmrh.com.au/images/JCESE101379ab.jpg

Now, for Guns10:

How did your engine blow? Apex seals? Over boost?

Either way, don't waste your money on a SR20DET, just get a new 13b. You can find one for around $800-$1000. Plus it will be a straight swap, no moving engine mounts are weird wiring.
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Old 07-10-2005, 08:26 PM   #9
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i love SR20's, but dont u think it doesnt seem right to have a Silvia motor(NISSAN) put into a RX-7(MAZDA)...if i were u, i would only put stuff that belongs to my car's manufacturer.
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Old 07-10-2005, 08:52 PM   #10
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Quote:
Originally Posted by j3ff
i think the one from japan is called the 3rotor or the 20b, thats the one u should put in

Thats the one i was talking about
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Old 07-10-2005, 10:46 PM   #11
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Originally Posted by FordFromHell351
If hes going to do that, he should just drop in a 390, or 302.

But my first choice would be to put another rotary engine into it.

Some company makes a complete kit for a LS1 swap into an FD Rx-7. That's why I recommended it.

Here... I found it. Hinson Supercars makes a LS1 kit and LT1 kit. Hmmm. for the price I'd just go to a junkyard and pickup a 94-97 LT1.

http://www.hinsonsupercars.com/
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Old 07-10-2005, 10:48 PM   #12
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Originally Posted by TurboLag
Thats the one i was talking about

The 20B is a nice, fun and rare engine. My girlfriend drives a 20B powered 94 RX7. It's loads of fun, but then again a LT1 or LS1 swap will yield much more hp/$ in the end.
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Old 07-10-2005, 10:59 PM   #13
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Yeah, the LS1 swap is pretty cool, but for me it goes against the soul of the car. Its like putting a gorilla in a suit. The gorillas powerful, and the suit is really nice. But they just don''t go together.
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Old 07-11-2005, 12:14 AM   #14
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Quote:
Originally Posted by Zalight
Yeah, the LS1 swap is pretty cool, but for me it goes against the soul of the car. Its like putting a gorilla in a suit. The gorillas powerful, and the suit is really nice. But they just don''t go together.


Props on the analogy Zalight, or whatever you would call whatever you just said. I totally agree
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Old 07-11-2005, 04:55 PM   #15
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Quote:
Originally Posted by Zalight
Yeah, the LS1 swap is pretty cool, but for me it goes against the soul of the car. Its like putting a gorilla in a suit. The gorillas powerful, and the suit is really nice. But they just don''t go together.

I'm a fan of keeping the FD Rotary powered too. But your options in that are keep throwing in 13b's or really spend a ton of money for a 20b. An LS1 or LT1 swap is just so much more of an economical decision.
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