13BAce

Now there are NO excuses for asking about porting.

http://mazdarotary.alphalink.com.au/porting.htm



http://members.optushome.com.au/rotary13b/porting.html

treceb

know my question is, are all porting plates the same for 13B 12A engines?? And what is a half bridge and what are its pros and cons??

hehe

13BAce

Do you mean the templates? If yes, then no, they're not the same. A half bridge is when you only bridgeport the front and rear housings, leaving the intermediate housing alone. You retain some of the low RPM smoothness of the stock style porting, but you don't get the top end of a full bridge. With a full bridge you'll also need 1 piece apex seals.

treceb

ahh, ok. so in your opinion what is the best set up for a quick NA street car. Id like it to have a tad of that distictive rotary sound.

Do you happen to know anyone that I can borrow these templates from??

13BAce

You're probably better off with a big street port. I don't know anyone who has a template. You basically just want to extend the port upward.

treceb

thanks.



I also like this site: http://members.rogers.com/sofronov/Cars/Ma...ry/Porting.html

13BAce

That's a good one too.

p0sta1

Could someone update the sites/pictures 13BAce linked to? If they need to be hosted I have *** loads of space.



email me p0sta1@pc-workshop.net

drifter

NOw at http://www.mazdarotary.net/index3.htm

and

http://www.rotary13b.com/rotary13b/index.html

Racer X

Check the engine building section in the porting thread for info.