A-Spec

I posted this in 3rd gen forum but was moved..

Anyway after my engine blew...AGAIN, I've had enough with turbos. So I thought about bridgeporting the engine, swapping to n/a FC rotors (maybe up the compression), and have a high revving (more) reliable FD. I don't drag, so big power is not what I'm after, single turbos are no fun for mountain drives, and I drive for fuel economy on the street.

how much power can a bridgeport 13b make?

From what I've seen NA is still capable of making quite a bit of power, I've been to Anniversary racing factory and their demo car made 350 hp, I believe that is with NOS and peripheral port. Here's a video
http://61.122.81.9/a-rf/video/samplevideo/FD_peri.wmv
here's the dyno chart.


here's one of their customer's car with bridgeport:
video (looks like tokyo extreme racer )
http://61.122.81.9/a-rf/video/samplevideo/fd_bridge.wmv
dyno:


I like to get around 220-240 hp.
what do you think? is it possible?

tks,
David

Madman

Possible, yes. But if you are mad about engines prematurely blowing, then bridgeport or p-port is probably not the way to go. Brigdeports go to about 30k at the most and p-ports you can plan on about half that.

rxrotary2_7

exactly what madman said. plus starting the car can become an issue. and you want it for street use? good luck on that conservative driving for fuel
maybe you should sell the car and go for a honda. they are great on gas (and i think ok in the mountain drives). i know your pain about the motors. (i went thru 5 in less than 48k miles )

A-Spec

hmm it's really not streetable?? well if it's not fuel saving that's fine with me also...but if it's not really streetable.

hahha nooooo Honda!! I can't have fun in a front wheel drive.

well so what are the charcteristics of a bridgeported engine?? life expectancy, power chacteristic/potential. I've looked on the web and most sites have the same info that it is loud and expect 220-260hp.

tks!
David

rxrotary2_7

for one, it doesnt see any power until the 4 to 5k rpm range....after that it is
there is plenty of info out there on these motors. just look around.
life expectancy is short compared to a normal motor. i would just forget about your idea for a street driven car. would be different and interesting route, but not for the reasons you are looking to do it

repuguru

One issue is exhaust restriction. You can not run mufflers. The bridged motor requires the full exhaust in order to do its work properly. I mean sure there are guys who do it, but to get what you want in power, which I assume is equal to what your car had with its original motor.
Why not consider doing a massive street port? Over lap will not be as big of an issue(low RPM response) and you can set it up with a good exhaust. You have to have a good muffler guy fabricate the system. But there are good parts out there to do it.
You will get the compromise you are looking for. But if you build a good motor you can go one step up and add nitrous. Then you back and beyond depending on what kind of NOS set up you use.

A-Spec

ok I admit hehe I didn't search that much. I guess bridge port is not such a good idea then..

Well mine does have a large street port already, what kind of hp am I looking at with just the street port running N/A with 9.0 compression? I would be happy with 220hp w/o nos.

David

repuguru

That would be interesting to see. I have heard the ports in the 3rd gen motors are the largest Mazda has cut. So large in fact that you could not duplicate the actual hole itself in a set of older 4 port housings?

I don't know this as fact. But hearsay..

The low comp rotors would not be to big of a liability with no turbo. Pre-78 13bs had 9:2:1 rotors. NA.

200 hp may actually be possible with a NA 93+ motor?

There has got to be someone or the 13,500 people who are in this web club who has gone and stuck a carb on a 93+ motor.

rxrotary2_7

i think a holley 650 double pumper would do the job n/a. i use one (for now) on my rx2 with a 89 motor in it. problem is now going to be a manifold....who makes one?

Droops83

Hey Aspec, I don't know much about porting, but i saw your in Goleta. WHere exactly? I'm a student at UCSB and would like to check out an FD (if yours is running???) Good luck man!

Chris

repuguru

I am sure that some type of adaptor plate could be or has been milled.

I have one to go from a 12 manifold to 13 engine. And one to go from a 4 port 13b manifold to 6 port SE motor.

duboisr

make an adaptor for a big side draft weber or a delorto side draft

rxrotary2_7

i think the holley is the better bet. but thats just my $.02