Well, i got my jspec s5 tII apart, and to my amazement and dismay, it had one S4 TURBO rotor, and one s4 N/A ROTOR!!!!. WTF is this about, lol. Talk about hodge podge, im suprised it even ran. Judging by the carbon, it had ran for quite awhile after the build up. Im assuming the person who owned the car in japan, had a rebuild done, and they stole his/my s5 rotors and put in those hunks of ****. However, they are in good shape too bad theyre useless to me. The rest of the motor, however, luckily, is s5 tII. Checked it all. Housings are perfect, irons are perfect.


Anyways, just thot you might like to laff at my misfortune.

 

damn dude that sucks. im getting a s5 jspec tII motor soon and after reading that im scared.

 

What's the big deal with an S4 rotating assembly other than a little lower compression? It couldn't have been mismatched or it would have run like *****.

I'd be more than happy to take those "hunks of ****" as you put it, S4 rotors off your hands.

 

i got the same thing only a little differnt. twice i got a bad deal on those jspecs. You never really know what your getting. For the money in my experience it is worth it to buy from a reputable builder and get a warrenty

 

Read closer, they were mismatched, one was s4 turbo rotor, one was NON TURBO. so one was 8.5:1 compression, and one was 9.5 to one

lol

im trading the rotors in for credit against s5 rotors.

 

They didn't have NA's in Japan so..........how.........

 

Thats what im wondering,.. it would have been very dificult for the builder in japan to get an NA rotor, and if he did he probably would hold onto it. I know in australlia NA rotors go for quite a bit more money than turbo ones because there rare over there and great for NA BP's and such. Are you sure the car is from japan and no somewhere like the uk? and are you sure its an s4 NA rotor? if so how do you know?

 

My apologies sir. I read it but my mind didn't accept it I guess.

Even if the rotors weighed the same I would think the difference in compression would make it run funky. But then again what do I know.

 

They had absolutely no n/a in japan? Hmm...how does my friend have jspec n/a rotors (high compression)

 

damn you got screwd and there is ANOTHER reason why jspecs are ONLy cores adn shouldnt really be used as a direct replacement.

 

To my understanding, the only NA's were the early 12A engines. I can't think of any model other then that which came NA from Mazda sold for the japanese domestic market.

What leads you to the conclusion of them being NA/high compression rotors? Just curious.

 

j-spec high comp n/a rotors. ok...........

 

they did sell the GSL SE in Japan which had High comp 13b rotors in it along with 3mm seals. Besides that they did not have any NA's in Japan, and the NA rotors they do have there are very pricee just as someone eles mentioned they were in Australia.

 

This is all very interesting!

How can you tell what rotor is from what? I've just been keeping mine seperate

 

Thats just wrong!

You should post where you purchased this engine, so other people wont have the same experience ! ! !

 

Mazda Rouche or something like that was NA as well

 

So how did it run before you took the rotors out?

heh.. thats hilarious, they must have been short on parts, and didn't know what they were doing, who the hell knows.

What is the difference between rotors, I know that its compression, but im guessing the T2 rotor has a larger dip in it than the N/a?

 

"Thats just wrong!

You should post where you purchased this engine, so other people wont have the same experience ! ! !"

what you fail to realize is that he got this from a importer. This guy bought this engine in a junkyard wholesale. This is not the importers fault and luckly he is standing behind his imported junk. For the last 2 years bone yards have been digging for every possible core they could get their hands on because of the "jspec" craze they could get $400 for every t2 rotary they find. As we all know the major importer no longer offer a warrantee because they are shipping anything they find. I have always said that this will be a good motor to rebuild/port/upgrade seals in. Then you know its bullet proof.

 

Damn,
That's crazy to find a Jspec w/ an NA rotor in it.

Like said above the GSL-SE was na so maybe it's from that engine.

My Jspec core came with a totally fubar'd front rotor and plates. The only usable parts were the rear and the housings.

 

The core i got was in excellent shape. Besides the wrong rotors, the eshaft was good, all the plates and housings were good, turbo was EXCELLENT, with no shaft play. So basically, the only part that was wrong was the rotors. The rest was low mileage goodness. The person i got the motor from took care of me too because of what happened, so in the end it worked out great. Its only gonna cost me 350$ to upgrade to s5 rotors from Rx7 specialist here in calgary. Hopefully ill be posting sick dyno numbers next season (=

 

Japan had a NA 13B in the Luce sedan 6 port "super injection" from 85-88 untill it went turbo in '87. It was 9.4 CR.

I think that engine was the same as our 2nd gen 13b NA as opposed to the 1st gen GSL-SE 13B?