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Depends, which engine is in the 85, 13b or 12a?
engine core - about 90kg's.
13B for N/A and 13BT for Turbo models.
it the engine code. 2 rotor, naturally aspirated rotary
Gsl= 12A , Gsl-se 13B.
Mazda's 13B for the 1986-88 RX-7 made 146hp without a turbo and 185hp with a turbo.
configure pheripheral devices
Engine number is underneath the distributor on front housing on the rough casting. If that fails check underneath the alternator on front housing.
on the 13b engine it should be behind the waterpump, just below the thermostat.
13b equals -169 = -156
check out rotary engine illustrated - there is a video you can download that shows how the timing works. if you search it on google then you will find it.
13b or 13b turbo