i got an 86 Fc and i just came by a Renesis motor for 1700...anyone know if the swap would work or not? thanks.

 

https://www.rx7club.com/search.php?searchid=3024980

 

^^ those links are only good for a set amount of time... How about you supply him with some REAL information?

Yes.. its possible... but its a PITA! 1700 dollars probably doesn't come close to everything you would need to do the swap.

What DOES 1700 include?

 

that woulda be a sick swap.

 

Whoops, didn't realize that about search results links. Like micaheli said, it isn't easy, but it has been done. There are many links on this forum that have covered this topic.

 

Long story short:

-add another $1000-$1500 for engine management
-a few hundred to make the engine mounts needed
-I have no idea what's involved with mating to the transmission but I guess you can swap on the FC flywheel and clutch
-a few hundred to do a custom exhaust
-you'll need custom rad, heater and oil cooler hoses
-custom fuel hoses and an upgraded fuel pump

Oh, and the engine management needs enough outputs to run the 3 sets of actuators (secondary ports, aux ports, VDI).

Then theres the tuning.

Overall if you could do this for under $5K I'd be surprised.

A search for "renesis swap" will turn up more more detailed info.

 

all i wanted to know was if the swap was possible or not. thanks.

 

Answer: Yes.

 

if its possible or not is kind of a dead effect, because anythings possible with enough money.

 

dont do it the renesis engines are **** compard the the original rotaries and like aaron said it will be alot of work. witch i dont believe to be worth it

 

Anything is possible with a welder and a little bit of knowledge. If you really want to find out what is needed, take a look at the Renesis engine mounts and the FC engine mounts. Then look at the bellhousing pattern on the rear of both engines. Now, look under the hood of an RX-8 and an RX-7. That should give you a general idea of the fabrication needed.

Also, a simple search on this forum for "renesis swap" will turn up lots of info.

 

Please qualify this.

 

Why does everyone think the renesis is a piece of crap?

I think the only downside to the engine is the compression isn't as boost friendly. Also i'm not sure if the exhaust ports flow as well, but who knows.

 

i work at Mazda in the last 2 weeks we have swapped over 4 engines out alone. there are serious flooding problems along with ignition coil problems not to mention all the other minor problems we have with them just b/c they are more powerful and efficient fuel and emission wise doesn't mean they are superior motor to the original 13b engine also alot of the time we have to call the mazda hotline for problems and they cant even explain some of the problems with the engine and have us just replace engines and coils witch in some cases still doesnt fix the problem. these engine are still fairly new and and have not had the years of developement that the older rotaries have had, but im sure with in the next few year the engine can become just as good as the previous engine if not better. also i am in the progress of buying and rx8 and as soon as warrentys up and the engine goes in will go a rew motor with a nice single on it!!! and yes i know all about the large amount of work that is involved in doing this but i will be a fun beast.
james

 

I don't want to start splitting hairs here, but:

-ignition coil problem != engine problem
-floodiing != engine problem (it was an ECU issue)
-if you replace the ENGINE and it doesn't solve the problem != engine problem

You seem to be describing problems external to the engine.

 

well we dont just drop engines in cars for no reason. there are numerous test that have to be done to the engine in order for the car to recieve a reman alot of the time compression is usually low and it will still be under warrenty witch means the engine is has less then 50k on it i believe that is a bit of a flaw for an engine to have low compression for such a low amount of miles on it considering the original n/a 13b can usually make i up to 150-200k before low compression is a problem
james

 

I do believe there were fixes for the flooding with the ecu i thought, and the low compression is the MOP problem you're supposed to update the ECU for. The coils aren't an engine problem.

 

there is no fix for the flooding beside putin the gas pedal to the floor to stop flow but alot of the time that doesnt even work sometimes they flood so bad that we have to pull all the plugs and crank it for 5-10 minutes put new plugs in (updated ones) i think they are just hotter burning then after that we still have to **** with it for another 10 minutes to get it to started. also were the largest dealer in the country all the cars have gotten there updates and still come back on a flat bed so if there were all these updates that fixed all the problems y are they still coming back for the same ****?
james

 

You didn't mention anything about the MOP. Did you do the ecu updates on the cars?

 

the mop is an issues on all of the generations engine the pump is setup and ran the same way as it was on the s5 and fd its electrical the s4 is the only one the was more reliable b/c it is mechanical. and i would have to say it is probably more like the s5 then the fd b/c it utilizes 4 injectors 2 on each rotor housing rather the the 2 on the fd and the main failure of the mop is customers lack of maintenance and the recirculation of dirty oil in to the engine same as all of the other engines.
james

 

I was talking to one of the 2 experienced rotary guys at the dealer over here and he said he had to reflash the ecu because of the bad mop software and that they had to replace engines that failed the vacuum test after speaking to someone on the phone.

 

thats tru but even after the software updates and all the test performed we are still get cars comin back that need engine i was just sayin the renesis is not superour to the older engines witch have had a lot more research done on them and dont understand y someone would wana go through the hassle of putting a completely different eninge it there car when the could just swap in the turbo engine with the same if not less work compared to the amount of work putting a engine in with less hp

 

Well thats definately true, but the renesis does have better emissions and fuel economy, it's had more research since it is basically the same engine.

 

i cant argue about that but the porting has changed on the engine so i is basically a differnt engine the ports were re moved from the housings and put all on the plates causing less exahust flow or at least more turbulance in it