3rd Generation Specific Talk about 3rd gen RX-7's here.

13b NA

Old Oct 6, 2007 | 06:06 AM
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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?
Old Oct 6, 2007 | 08:22 AM
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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
Old Oct 6, 2007 | 10:23 PM
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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?
Old Oct 6, 2007 | 10:39 PM
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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?
Old Oct 7, 2007 | 06:30 AM
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can you just change the motor mounts?
Old Oct 7, 2007 | 11:09 AM
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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.
Old Oct 8, 2007 | 02:22 AM
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just a header? nothing else is needed to make it NA?
Old Oct 9, 2007 | 11:30 AM
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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.
Old Oct 10, 2007 | 07:51 AM
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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?
Old Oct 10, 2007 | 08:26 AM
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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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