ok so as the name states im new to rotary...not tuning just rotary......lookin into gettin an rx7 as soon as i can but in the mean time just doin a little research
..........what exactly is a bridge-port motor the only reason i ask is a friend of mine has one for sale for like 100 bucks........is it just like a port and polish job????
i am going to but the engine even if its useless, if anything else for expeirence in tearing down a rotary....so please help out with any comments.....thanx

 

welcome to the board.

sucks that this is your first post ... because if you've never seen the inside of a rotary before, then all the explanations in the world will not help you see what is meant by "bridge"-port.

anyway, here goes ...

essentially, aside from the stock ports, you have 3 major choices of porting styles for a rotary. [1] streetport, of varying sizes, essentially enlarges and reshapes the stock ports, but usually allows all seals to carry on about their business without jeopardy and doesn't compromise the waterjacket. [2] bridgeport basically enlarges the stockport beyond the path of the corner seals - but a "bridge" has to be left for the corner seals to ride on or else they'd just drop into the intake and you get the "engine-go-boom"-scenario. [3] peripheral port completely deletes the stock side ports and ingests air/fuel through holes cut into the rotor housings themselves.

that's the most basic description i can give to you. one other thing to keep in mind is that you can have an engine that incorporates any 2 or even all 3 porting styles depending on your budget, experience and goals.

my advice is spend time tracking down pictures of rotary engine parts and learn what is what and how it works.

 

http://www.mazdatrix.com/faq/portbp.htm

 

k thank you both for youre help