I have a 12a stock with 98k that I installed in my 85 and a 13b 6 port
that needs to rebuilt " blown seal" so for me to decide what to do both eingen I would like to know what is the diference between J bridge port, D bridge port,
street port, 4 bridge, and 6 port and pleace if you dont mind explain with plany
details. my inglish is not that good when it comes to cars. Im PUERTORICAN

 

Lets start with saying you don't want a p-port or a j-port. Don't even consider them.

The difference between a 6 port and a 4 port is how many overall ports there are in the engine. 12A's are 4 port, 13B n/a motors are 6 port, and 13B Turbos are 4 ports.

A street port is just enlarging the ports on the engine, intake and usually exhaust.

A Bridgeport adds an extra port along side the ports.
http://www.rotaryengineillustrated.c...e-port-16.html

If you are not looking at sending lots of money or using a stand alone engine management system, then do a street port.

 

the pre-'79 13b was also 4 port.

 

hey! thanks for that web site thats the best info I have recieved since Ive been around rotory
eingens. Every body else has been a little selfish about any info like that for the simple reason
to keep me giving them money. now I know where to go when I get ready to rebuilt the 13b!