6-port, street, and bridge?!?!
06-10-02, 01:25 PM
#1
SpAz!
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6-port, street, and bridge?!?!
im new to the rotary and have heard alot about "porting". it keeps popping up in places and im dyeing to figure otu exactly what it is. i think i have a general idea but would just like to be sure and have a mroe in depth understanding how how it works and such. thanks for you help :]
06-10-02, 01:56 PM
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06-26-02, 11:34 AM
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Not quite true
Early 13B's had 4 ports
All production 12A's have 4 ports
13B's as fitted to 2nd gen N/A's have 6 ports
13B turbo's have 4 ports
The six ports were used in a similar way to the VTEC cam system on the hondas .... when the engine reaches a preset RPM/load level the extra ports open up allowing the engine to breathe better and make more top end power.
This is a benafit as they are closed at low rpm's so the engine produces good torque at low Rpm's too.
Well thats how I see it working anyway
Mike.
Early 13B's had 4 ports
All production 12A's have 4 ports
13B's as fitted to 2nd gen N/A's have 6 ports
13B turbo's have 4 ports
The six ports were used in a similar way to the VTEC cam system on the hondas .... when the engine reaches a preset RPM/load level the extra ports open up allowing the engine to breathe better and make more top end power.
This is a benafit as they are closed at low rpm's so the engine produces good torque at low Rpm's too.
Well thats how I see it working anyway
Mike.
06-26-02, 12:16 PM
#6
Originally posted by MikeLMR
Not quite true
Early 13B's had 4 ports
All production 12A's have 4 ports
13B's as fitted to 2nd gen N/A's have 6 ports
13B turbo's have 4 ports
The six ports were used in a similar way to the VTEC cam system on the hondas .... when the engine reaches a preset RPM/load level the extra ports open up allowing the engine to breathe better and make more top end power.
This is a benafit as they are closed at low rpm's so the engine produces good torque at low Rpm's too.
Well thats how I see it working anyway
Mike.
Not quite true
Early 13B's had 4 ports
All production 12A's have 4 ports
13B's as fitted to 2nd gen N/A's have 6 ports
13B turbo's have 4 ports
The six ports were used in a similar way to the VTEC cam system on the hondas .... when the engine reaches a preset RPM/load level the extra ports open up allowing the engine to breathe better and make more top end power.
This is a benafit as they are closed at low rpm's so the engine produces good torque at low Rpm's too.
Well thats how I see it working anyway
Mike.
although Japan did have a "production" 6-Port N/A 12A motor for a limited time..
(Directfreak ducks and runs..)
06-26-02, 12:33 PM
#7
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BAAAH ! The Japanese get all the good stuff !
You guys did get 13b engines in 1st gens though ...
where as Japan had to "make do" with "just" a production 12a Turbo
You guys did get 13b engines in 1st gens though ...
where as Japan had to "make do" with "just" a production 12a Turbo
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