Keith13b

iTrader: (6)

Crazy idea! Looking for advice. Searching so much made my eyes cross and couldn't find what I need. If you have knowledge to do this, please respond. If any re-build companies are reading please chime in.

I have a good condition shortblock from an 89 GTU. My goal is to "make" a TII motor from it; if it is possible when I re-build it. Just guessing, but I bellieve I'll need 4-port plates and low compression S5 TII rotors + manifolds. Is it this easy, or have I smoked some crack unknowingly? I will use a complete stand alone ECU/Turbo, etc. Believe it or not, I want to put it in an 85 GSL-SE. So just looking to make a TII block from an NA short block- lets ignore the turbos, wiring harness, etc.... I'm only talking about the motor to keep things simple. I also have a perfectly running GSL-SE motor still in the car as well as extra SE front covers and oil pan, pick up tube, etc. I just want to know if its feasable before I go any further.

I'm looking for ways to save buying a whole good condition TII motor (if one even exists for sale!)- everyone I find is trashed and I have a great 13B sitting here collecting dust! This GTU engine is solid. Also anyone know if 13B rew plates are interchangeable? I'm interested in buying a low $$ core TII engine just to get the manifolds, plates, etc- assuming the housings are useless. My N/A housings are presumed good. Can ANYONE throw some advice my way.

Is it possible to buy a TII core and rebuild my N/A using the appropritae parts from the TII to make a good running motor?

Thanks!

RTRx7

iTrader: (2)

There is a ton of information on this topic if you simply search. Long story short, it would be much cheaper and easier to buy a turbo 2 engine.

AGreen

iTrader: (11)

^Scratch what he said. You're crazy! Out of your mind even!! This has NEVER been done before, and good luck trying.

jjcobm

iTrader: (18)

Too Crazy


Why not just stick the TII engine you will use as a donor, in the car, instead of taking it apart, only to put it all back together again!? (You might of hit the crack pipe unintentionally for this reason also)

What you proposed on doing is basically taking TII internal engine components, and finishing building the rest of the block up with N/A oil pumps, front cover, ect.... I will have to agree with everyone you will be better just buying the whole TII engine, since it's essentially what you are doing anyways, only making it slightly obsolete by adding N/A components...

But if thats what you really want, you are on the right path...

Dltreezan

iTrader: (3)

RTRx7

iTrader: (2)

My bad, I was being nice.

AGreen

iTrader: (11)

Really, you should research things before asking this question. NA->turbo has been done 4million times, and has been discussed 10x that. Here, read this page:
http://www.aaroncake.net/RX-7/naturbo.htm

For your GSL-SE, you're going to need to use the front cover if you're going to throw in the
GTU engine. I don't see why you just don't do this to the GSL-SE engine anyways. Leave the engine completely in tact, get the TII manifolds and turbo, a FMIC, a completely new fuel system & ECU, and call it good.

Or, just save some time and money, and a ton of cash, and buy nitrous. You've already got a donor engine, right?

Keith13b

iTrader: (6)

Thanks- I'll check it out. Most of my searched turnes up opinions more than facts. My main questions should have been can N/A housings be used in a TII motor. I guess people mis-understood my intentions.

The engine in the GSL-SE runs great right now, plus I have extra front covers, pans, pick ups, and engine mounts collecting dust. I'd like to leave the GSL-SE motor in there during the rebuild and then keep it as a spare when I'm done.

My ultimete goal is to put a TII under the hood, but I can not find a good compression TII engine at reasonable price, so I was hoping to use the housings from a good motor I have and re-build the TII with good known parts.

I will still need low compression rotors to get adequate boost.

Already have that....pretty funny you mentioned it. I got tired of re-filling the bottle and got inconsistant results in the past. The reliability and smoothness of a TII is what I'm looking for. Besides I have shattered 2- count them 2 - RB 4.44 ring and pinions on top of the stock one. Gets pricey after a while!!

AmviciousRav

iTrader: (5)

I saw something interesting that Japan2LA was selling, it was inserts for N/A housing to make them t2 housing

found it

https://www.rx7club.com/2nd-generation-rx-7-1986-1992-parts-194/exhaust-sleeves-inserts-tii-fc3s-3-pairs-sale-872681/

i guess that might be a step in a new direction

AGreen

iTrader: (11)

Oh no you won't! The NA rotors aren't really that high compression anyways. On top of that, you'll get faster boost response with NA rotors. SO... if you have an S4 turbo, you won't even need that twin scroll BS. The only thing you'll have to worry about is whether you'll have the engine tuned correctly. You'll need the proper amount of fuel to prevent grenading your engine.

Many people are sooo much happier with NA engines they've turbocharged BECAUSE of the high compression rotors. Hell dude, you can even MAKE your own custom exhaust manifold and throw on a larger turbo and make some SERIOUS power, all because NA rotors will spool a bigger turbo with ease.

I'm not sure whether you understood about the GSL-SE front cover or not, but once again, you'll need to slap one of them on the front of whatever engine you're planning on dropping in there. The FB utilizes an engine mount on the front cover. From there, you can use the GSL-SE transmission and everything behind it, so long as you use the NA flywheel and clutch.

Keith13b

iTrader: (6)

Thanks for the reply. And yes, I have spare GSL-SE front covers, oil pan, pick up tubes, etc. In fact I have several spare engines in the garage. I was a re-builder 15 years ago, but only ported and re-built N/A motors. I am now ressurecting some old projects and was hoiping to use my spare parts, buy some 4-port plates , TII rotors and manifolds and dress up a TII under the hood.

Do people who turbo their NA keep the 6 ports or swap in the 4-port plates? You can be a loty more aggressive on the porting w/ 4-port irons.

AGreen

iTrader: (11)

If I recall, I think they just remove the 6port sleeves and leave it all open. The high~ish compression rotors get boost quicker, so you won't get turbo lag, or for that matter, you wont lose torque in the low end with them wide open.