I'm sure that this has been covered here before, but what about going the "other" way and putting a 1.6 or 1.8 miata engine into a 7? I know that I'll get a lot of whys and stuff but it's late, im bored, and Im benchracing. I know that mazda's transmissions weren't a whole lot different from model to model so I'm sure that a solution could be found for the tranny. Has anyone ever done this? they are actually pretty stout engines from what I understand and with a set of pistons and some turbo love they can put down some ponnies. I'm thinking that a megasquirted and turboed 1.8 would be nice in my GSL-SE! Any ideas you guys have would be great https://www.nopistons.com/forums/pub...#>/biggrin.gif

isnt it usually the other way around? most people put the 7 engine in a miata

That is the same thing I thought! My dad has a Miata and is thinking about putting a 13B in it.....I've never heard of putting a Miata engine in an RX7!

I'm sure it could be done, but unless you have a strong preference for "boinger" engines, it seems backwards to be thinking about putting a piston engine in an RX-7.

I've never heard of the Miata engine being considered strong. Remember Miata people consider 300 hp a lot of power.





If you're going to go to the trouble, I would look for an aluminum block motor, or it ends up weighing more than you hoped for.



Think Ecotec. CNC ported heads available through your local GM parts counter. https://www.nopistons.com/forums/pub...IR#>/happy.gif Motor pulled out of some smashed up Cavalier or Cobalt at your local junkyard.

me and a buddy thought about droppin in a miata 1.8 into a fc along ass time ago but the plan fell threw as we both lost interest. we where goin to build a all motor not turbo or n20 just something like a 13-1 motor with 4tbs and what not. would have been an odd sound but i think it would be cool. ever think about a KLZE motor?



randy

The miata engine (at least the 1.6) is the same engine as the 323 gtx turbo engine save for the pistons. The block is fairly stout and has piston oil squirters. A rotary is a had engine to tune to turbo from what I understand, detonation kills them real quick. I'd like to do a turbo engine and the miata engine would take some knock so it would be more likely that I could tune it myself. I'm really just wondering if it has been done

hmm, having looked at a rotary miata, a miata engine fc is cake. use the 1.8, the 1.6 is not all that strong in a miata. you can only use the na style transmission as the turbo trans doesnt have a miata bellhousing.



so best way (easiest), get the miata motor, and trans. put the fc bellhousing on the miata trans, and then the engine mounts on the fc are 1" further apart, so you need to slut the holes. then the engine is in the car. exauast is on the wrong side, so you need to re route that, theres tons of room though. clutch slave is in a different place too, but you just need a really long clutch hose. radiator hoses are smaller on a miata, but thats not a big deal, use the miata radiator.



miata engine is heavy, its iron block, and stupid (its got uppy downy parts), so you're prolly adding more weight than a 3 rotor swap. and the miata guys get excited about 125rwhp without the turbo, which is basically what an s4 fc puts down stock....

So the bellhousing is the same on a miata and n/a rx7?

no but u can bolt the bell housin on to the miata trans

no. the trans design is the same. so you can put the fc tail housing on the miata trans and it will go right into the fc

oh so am i wrong then?

All that mazda reliability without the pesky side-effect of HP. https://www.nopistons.com/forums/pub...1047683785.gif

This would be actually going into a FB if I would do it. I've heard that with different pistons and a turbo you can make some real power with a 1.8. Does the miata trans have a removable bellhousing? I know that the N/A RX7 has a non removable bellhousing but if the mita's is I might be able to put it on a T2 trans. No one knows anyone who has done this?

the na rx7 and miata transmissions are the same design. you just need to put the fc or fb tailshaft housing on the miata transmission. the miata input shaft is a little longer, and the gearing is better in the miata trans.



t2 trans can be made to work in a miata but its a huge pain in the ass. there is no miata bellhousing for a t2 style transmission.



and tyson is kind of right, by the time you make "real power" in a miata, you're in it way more than a 13bt, and making almost the same power. price the miata stuff out its crazy money

If you are looking to do this to be different, just don't. You are looking at an engine that was used for good gas mileage, not performance.



Also, you gotta figure when the miata guys go nuts over 300rwhp, the Miata is also a HELL of a lot lighter than an RX-7 is.



Weigh out what you want to DO with the car, not look at how different the car would be.

Since I'm a Miata guy looking into a 13b swap, I'll chime in.

The 1.6 (B6) weighs about 30 lbs more than a 13b (n/a) and the 1.8 weighs about 50 lbs more than a 13b (n/a)...plus with both engines, you're moving more weight forward and upwards (not that its overly noticable to most drivers)

As far as the conversion, I see it being quite easy compared to a 13b into a Miata. Theres no need to modify the firewall or tranny tunnel either. And swapping the bell-housing from the Miata tranny to the FC n/a tranny is a very good idea. You'll get a longer 1st year, which is nice considering most turbo or s/c Miatas don't really use 1st much b/c its so short, and a taller 5th gear which helps interstate driving immensely.



woohoo! 1st post.

20b is about 50lbs more than a 13b https://www.nopistons.com/forums/pub...#>/biggrin.gif



but yeah, putting a miata motor into the fc would be really easy.



i do wonder about hood clearance though

I would think that is an LS1/2/6/7 will fit underneath a Miata's hood w/o very many clearance issues, a B6/BP will fit under a FC/FD hood w/o issue. I'm not too sure about older RX's though.