NoPistons -Mazda Rx7 & Rx8 Rotary Forum

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-   3rd Generation Specific (https://www.nopistons.com/3rd-generation-specific-18/)
-   -   13b NA (https://www.nopistons.com/3rd-generation-specific-18/13b-na-67651/)

NRTI RX 10-06-2007 06:06 AM

Does anyone know somewhere i can get a 13b NA engine from? i dont know if theres different kinds but if there is what will fit in a FD?

TYSON 10-06-2007 08:22 AM

They won't drop right in because the motor mounts don't line up, but there's no reason you can't make the stock motor naturally aspirated.



This nutcase did;



http://cranked.nopistons.com/index_files/Page1109.htm

NRTI RX 10-06-2007 10:23 PM

wow, lol. Well looks like ill have to make the stock engine NA. What will i have to do to the engine to do this? I got a reply in another thread about it but it didnt really make to much sence to me. Oh and how long would it take to make the stock engine NA?

NRTI RX 10-06-2007 10:39 PM

ok just curious about this, in a piston engine you have to drop the compression ratio in the cylinders right to cope with the compressed air? Which obviously requires changing the pistons and fitting new ones. I dont know if its the same with a rotary but, would you have to change the rotor when your running an NA tuned 13b?

NRTI RX 10-07-2007 06:30 AM

can you just change the motor mounts?

treceb 10-07-2007 11:09 AM


Originally Posted by NRTI RX' post='884768' date='Oct 6 2007, 11:23 PM
wow, lol. Well looks like ill have to make the stock engine NA. What will i have to do to the engine to do this? Oh and how long would it take to make the stock engine NA?

remove turbos. install header. if the engine needs a rebuild id look into s5 NA high comp rotors.



its not the motor mounts per say but the location of the motor mounts.

NRTI RX 10-08-2007 02:22 AM

just a header? nothing else is needed to make it NA?

Mahjik 10-09-2007 11:30 AM

The answer is the same as to what I gave you in the other thread. If it didn't make sense, then you have no business trying to work on a rotary engine.

NRTI RX 10-10-2007 07:51 AM

well i think i was drunk cause i seriously dont remember saying any of that lol. anyway point being i understood what you said but will i need to install a new header? or new rotors beacuse of the comp ratio?

Mahjik 10-10-2007 08:26 AM


Originally Posted by NRTI RX' post='885062' date='Oct 10 2007, 07:51 AM
well i think i was drunk cause i seriously dont remember saying any of that lol. anyway point being i understood what you said but will i need to install a new header? or new rotors beacuse of the comp ratio?



There is nothing internally which is required to be changed for going NA. There are things you can do internally for more/better power when going NA.



Since the 13B-REW comes stock with twin turbos, there's an exhaust manifold which connects the turbos to the engine. With removing the turbos, you will replace the exhaust manifold with headers (either custom or possibly from an FC).


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