Nick45

I'm about a week away from building up a street ported 4 port 13b and I had some questions about porting the intermediate plate. I've have hurd that in a street port you leave the intermediate alone and port the side plates. But it's tempting to port them all. What's the deal? thanks.


Nick

calvinpaul

iTrader: (2)

Port them all, and if you want to go slightly higher, give the center plate a medium to large streetport, and give the end plates a small to medium bridge.

Nick45

I would like the car to be fairly streetable so I'm hesitant on going bridgeport plus fueling that beast. I haven't bought the carb yet and but leaning towards a weber 48 ida. Would that fuel a bridgeport or would I have to go weber 51?

DriveFast7

iTrader: (1)

48 would function but 51 would make more power. MPG ~11

Nick45

Thanks guys for the info. another question I had before grinding is I bought the rb street port templates and the way they line up, 95% of the material I remove is from the top of the port. That sound right to you guys?

Alex-7

From the pics I've seen, that sounds right. Look on mazdartix, if I remember right they have a good explination of porting with pictures.


Less than a week away huh? keep me posted..........................


--Alex

Rx7carl

Yes most of the material removed in a port job is the outer edge and upper end. Its for an earlier opening and later closing giving more duration, not sure if theres any overlap on a SP. A BP gives overlap on the ports, like a hot cam on a boinger which accounts for the brap brap loping idle.

calvinpaul

iTrader: (2)

If you go half bridge, you can use a 4 port (holley), and when you are on the primaries you will get better gas mileage, and when you romp it you will be thrown back in your seat.