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-   -   rotor help (https://www.nopistons.com/2nd-generation-specific-17/rotor-help-5171/)

bigtime 09-10-2002 04:28 PM
how can i tell the difference between turbo rotors and na rotors?

SoniX 09-10-2002 04:52 PM
turbo rotors will have a lower compression than N/A rotors, the weight may also be dfferent, or is that the diff between S4 and S5?

bigtime 09-10-2002 05:11 PM
i need to know like markings on teh rotors so i can be sure these are turbo rotors

j9fd3s 09-10-2002 09:26 PM
the 74-85 rotors all have 3mm apex seals, and wiegh a ton

the 86-88 rotors have 2mm seals, the cumbustion recess is left as cast, the turbo has a deeper recess than the n/a ones

the 89-91 rotors have machined cumbustion recesses. there are no markings to tell the t2 from the na, you have to compare

the 92-02 rotors have deeper rotor bearings, and crome plated apex seal grooves



mike

13BAce 09-10-2002 09:30 PM
Originally Posted by SoniX' date='Sep 10 2002, 02:52 PM
turbo rotors will have a lower compression than N/A rotors, the weight may also be dfferent, or is that the diff between S4 and S5?
S4 rotors are heavier than S5 rotors, but NA and TII rotors from the same year weight the same. They even use identical counterweights.

13BAce 09-10-2002 09:31 PM
Originally Posted by bigtime1148' date='Sep 10 2002, 02:28 PM
how can i tell the difference between turbo rotors and na rotors?
Why are you trying to find this out?

89 Rag 09-11-2002 05:06 PM
Aren't the rotors classified in pairs by weight as well(allowing for Mazda's factory spec balance) like A's, B's etc.

j9fd3s 09-11-2002 05:43 PM
Originally Posted by 89 Rag' date='Sep 11 2002, 03:06 PM
Aren't the rotors classified in pairs by weight as well(allowing for Mazda's factory spec balance) like A's, B's etc.
nope they all are the same



mike

89 Rag 09-11-2002 06:03 PM
Originally Posted by j9fd3s' date='Sep 11 2002, 04:43 PM
[quote name='89 Rag' date='Sep 11 2002, 03:06 PM']Aren't the rotors classified in pairs by weight as well(allowing for Mazda's factory spec balance) like A's, B's etc.
nope they all are the same



mike[/quote]

Really, I was under the impression that Mazda allowed 45 or 50 grams of im-balance in the engine, part of this imbalance being the diff. between rotors. Maybe a lettering or numbering system wasn't developed by Mazda

but I thought that what it was used for. ?


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