In a message dated 3/17/2008 12:33:39 P.M. Eastern Daylight Time,
echristley@nc.rr.com writes:
Port Timing
IO = Intake opens
IC = Intake closes
EO = Exhaust opens
EC =
Exhaust closes
US Model First Generation RX-7
IO 32° ATDC
IC 40°
ABDC
EO 75° BBDC
EC 38° ATDC
European Model Model First Generation RX-7
IO 32°
ATDC
IC 50° ABDC
EO 75° BBDC
EC 48° ATDC
First and Second Generation 6-Port 13B
Primary
intake (Part throttle/cruise)
IO 32° ATDC
IC 40° ABDC
Secondary intake
(Part to full throttle)
IO 32° ATDC
IC 30° ABDC
Auxiliary high speed
ports (Full throttle above approximately 4000 rpm)
IO 45° ATDC
IC 70°
ABDC
EO 71° BBDC
EC 48° ATDC
Second and Third Generation Turbo 13B
IO 32°
ATDC
IC 50° ABDC
EO 71° BBDC
EC 48° ATDC
Racing Beat "Street Port"
IO 25° ATDC
IC 60°
ABDC
EO 84° BBDC
EC 48° ATDC
Racing Beat "J-Bridge Port"
IO 115° BTDC
IC 72°
ABDC
EO 88° BBDC
EC 57° ATDC
Mazda Factory Peripheral Port
IO 86° BTDC
IC 75°
ABDC
EO 73° BBDC
EC 65° ATDC
This page is getting too long to work with. Here is the port timing from
Paul Yaws web page.
www.yawpower.com. His tech
articles are the best.
More to follow.
Lynn E. Hanover