Jump to content
HybridZ
auxilary

So you want to swap a ROTARY into your Z! (how-to)

Recommended Posts

Guest raygorsuch
This is really really REALLY dumb lol, a true waste or time, money and space lol........... blasphemy

 

wow... 1st post. SMOOTH move NISSAN4EVER... Do me a favor and read something before you try to speak, it might help you a bit.

 

I'll be suprised if he lasts 10 posts at this rate. Oh well.

 

If you DON'T want to get baned, you'll want to study the rules of the board.

 

Did you call it or what... exactly 10 posts.

 

I have a '73 Z with a sick engine and I was considering doing this swap since I have an S4 donor car with no title and a good engine. You may want to consider marketing the engine mount since the rotary world has such a following (and because I would buy one).

 

I am not new to rotaries having owned a '79 RX7 for about 3 years, and pre-mixing isn't that bad. I carry graduated clear soda bottles full of 2-cycle oil and drop a set amount in the tank before filling up (I buy the gallon jug of oil because it is cheaper that way). At this point it is no more out of the ordinary than un-screwing the gas cap.

 

Keep the info coming as your project takes off - some of us are taking notes as we are cheering you on...

 

-Ray

Share this post


Link to post
Share on other sites
Guest RotaryBuddha

Great thread. I've been thinking about doing this swap for a while. Did some searches and found this place. I've been into rotaries for ten years. And owned 5 different rx7s over the time. Auxilary are you one rx7club.com?

The only thing I would like to know more about is the motor mount? Also did you rebuild and port the motor? What turbo is that? Idemitsu is the best premix IMO. http://www.mazdatrix.com/q-supply.htm

Share this post


Link to post
Share on other sites

i used to be, but for some reason my account exists, but not able to post/send PMs. I reregistered last night.

 

motor mount was custom built from scratch. Motor wasn't rebuilt by me, but it looks like it was rebuild in hte past judging by the amount of silicon squished out from between the housings. Turbo is a garret t04s, .7 cold, .84 divided hot, 60-1 and p-trim.

Share this post


Link to post
Share on other sites
Guest RotaryBuddha
i used to be, but for some reason my account exists, but not able to post/send PMs. I reregistered last night.

 

motor mount was custom built from scratch. Motor wasn't rebuilt by me, but it looks like it was rebuild in hte past judging by the amount of silicon squished out from between the housings. Turbo is a garret t04s, .7 cold, .84 divided hot, 60-1 and p-trim.

 

I'm on their under the same name RotaryBuddha.

 

Yeah too much silicon squished out the side can be a bad thing too. I would just do a compression check just to make sure. I would hate to see a project like this get complete and then the motor won't turn over because of low compression. Here is a link to two different ways of checking compression.

 

http://www.rotaryresurrection.com/2ndgen/tech_compression_check.html

 

With a good street port and that turbo at 15-20 psi you should be looking at least 400rwhp.

Share this post


Link to post
Share on other sites

I must see more about this. The reason I sold my 240Z was because I wanted to make room for an FD3 RX-7. Now that I have got the rotary bug I have been starting to plan out a build for a 20b 240Z... what was your reasoning for not using the 20b? Expense of the motor (since they are about double the price :()?

Share this post


Link to post
Share on other sites

Wow. This build looks intense. My hats off to you Aux. I stumbled on your post and was really amazed at this. I drive a T2 so pre-mix isn't a big deal. Seriously, it becomes a routine when filling up. I'd love to see a video of this car when its up and running. Keep us posted!

 

BTW, what type of rear are you using to keep the power down?

Share this post


Link to post
Share on other sites
Guest RotaryBuddha

Glad to see it still going and that you didn't sell it.

Share this post


Link to post
Share on other sites

Aux, I'm a rotary novice, so please, don't hurt me... :)

 

The 20B is basically a 13B with an extra rotor and a longer eccentric shaft. If so, is it possible to fit a 20B using the original 13B mounts? I read a few articles with 20B-swapped RX-7s, and they all used custom (or modified) subframes. Another question - is the 20B much longer than 13B, i.e. will it fit behind the shock towers if mounted close to the firewall?

 

It's sucha a pity that there are no rotary specialists in my area... Rotaries are usually swapped out in favor of conventional piston engines, and Wankel powered cars are becoming rare these days. I once drove a carbed 12A RX-7, and I instantly fell in love with the engine. I've been thinking about a rotary in a Z ever since...

Share this post


Link to post
Share on other sites

i'm using a front mount points from a 12a/13b from 1st gen rx7. standard 13b/20b mounts are on the sides at the rear of the block.

 

You could theoretically mount a 20b to end at the strut tower level, however, this would shove the shifter about 7-8" further back, and it'd be a paint in the butt to shift. 20b is about 1/3 longer than the 13b. It's an extra rotor housing and extra side housing, about 7-8 inches, or 177-203mm

Share this post


Link to post
Share on other sites

you could theoretically use the stock ECU, but the stock ECU for the 13b-re is mapped for automatic transmission only.

 

Advantage of stand alone is you can do away with the rat's nest of vaccuum lines and senders that aren't needed for a swap.

 

Of course, you can use a stock 13b ecu with 13b s4 or s5 motors. Mine's not as much of a common rotary as others, despite sharing a lot of things

Share this post


Link to post
Share on other sites

I found some links online for some aircraft conversions.. to use a mechanical driven oil pump.. which is attached to the throttle shaft to regulate the amount of oil sprayed in the motor...

 

So you can pre-mix or use a variable amount of oil

http://www.gdsys.net/WWWmembers/unicorn/WANKEL/wankel.htm

Share this post


Link to post
Share on other sites

Great to see another rotary swap. If you haven't already found a place for the oil return line, there's two place's you can use. One is the stock location on the rear housing behind the exhaust, you can simply cut out the hard line out of the flange and weld a steel AN fitting on it. The other is the front cover just behind the OMP. If your using the gsl se cover just below the omp is great place for it simply drill a hole and tap in a new thread for a AN fitting. I used the front cover for the oil return line on my Rx3 and I used the rear housing on my friends 510 this car also has a Cosmo RE motor on it.

 

As for the OMP I use the "poors mans" way using the mechanical OMP from the first gen RX7 and leave it open half way it will smoke a little at idle but works great (This is on the RE 510). If you want to get creative go to the RX7club there's ton's of write up on the OMP. And check out Rotary Aviation the sell some kind of gadget. I just premix it not that bad.

Share this post


Link to post
Share on other sites
yep, already did that.

 

I'm just going with running pre-mix

 

Ahh some how I missed that. That motor should give you at least 350 - 400 whp. look's like you've done your home work the swap looks great.

 

The 3 rotor may fit in there nicely, the T2 trany can can be shorten by 4" from the shifter housing which bring the shifter up forward just below the stock shifter hole. But yeah it very expensive to build.

 

 

Note to my self: follow this build....

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


×
×
  • Create New...