Bridgeport rotary

[sb3]

Sorry guys didn't mean to intrude this forum . I'm just wondering if any Rotary sifus here know the meaning of 'Bridgeport Rotary '. Just happened to come across this word when I was browsing thru You Tube for the FC RX-7. When its bridgeported RX-7, the engine sounds like 'brap,brap,brap,brap' . Any idea guys?

TIA.:wavey:

 

[savahn]

Someone correct me if I'm wrong here.

For 12B and 13B rotary engines, the intake and exhaust ports can be cut to make them "larger". There are 3 general types of port designs - street to bridge to ... cant remember. That's going from mild to extreme.

Bridgeports tend to have a very aggressive cut of the port and may even feature another smaller port next to the main port. Imagine it as a "j" where the main port is the curve and the smaller port is the dot.

RENESIS rotaries are a little different coz the exhaust ports are no longer peripheral but instead mounted in the side housing.

 

[Lennon]

Bridgeport makes the car hard to tune, harder to drive and 'drink' extra more........

 

[effie]

Hahahah..... did it once to 1 of my many Rx7 FD engines that i had gone through a decade ago. Not a very good idea. Low end torque is bad but high RPM WOT was awesome..... Very hard to tune..... Very noisy Brap Brap Brap Brap...... and yea, gobbles down tons of fuel even at idle..... 2 months later i rebuilt another spare engine.... but this time with a mild street port (larger intake port and exhaust port). Much more driveable..... Plus i did't have to explain to my family why my car sounded like it was gonna EXPLODE ...... Hahahahaha

 

[woaychee]

like this?

 

[effie]

hahaha...... yea.... like that.... I'm sure that car sounds louder in real life. My car kept on setting off my neighbours car alarms...... Nice to hear that brap brap brap sound again...... Only thing is that mine was a lil more higher pitched..... Maybe coz of different exhaust systems......

 

[savahn]

Bridgeports are ridiculously loud. Heard one in Oz and i was thinking "no way i'm gonna do that".

That said, it produced a ridiculous amount of power - 800HP. This was a turbo-charged 13B-REW.

 

[elsm80]

The only reason why there's a "bridge" is to keep the seals from falling off the rotors, this is due to the extremely long duration a bridgeported car runs.

Thats what I read anyways

 

[SomeGuy_sg]

http://www.rotaryengineillustrated.com/porting/15.html

A good reference about porting and how it affects the engine :)

 

[sb3]

like this?

Yup thats the sound! Is it your car ?. I bet there r not much ppl would dare to race with you, hahaha, the sound already very fierce.:proud:

 

[sb3]

Bridgeports are ridiculously loud. Heard one in Oz and i was thinking "no way i'm gonna do that".

That said, it produced a ridiculous amount of power - 800HP. This was a turbo-charged 13B-REW.

Can it produce better power output if its NA?


Anyways thanks for the great info guys, cheers!

 

[woaychee]

nah, a crazy friend of mine. now the car rotted in garage for 2 years coz not drivable in city. only fetch his car to track fool around with his evo's car gang.

dude, don try this with your engine. really not worth the penny if u plan to drive in city.

 

[BLaCkHoWLiNG]

wah.. bridge port!! prappp praappp praappp.. niceeee!!!

 

[SomeGuy_sg]

To answer sb3, Yes it will give better power is the higher rpms. That is what the porting does. To move the power band into the higher range. Porting for rotary engines are a double edged swords. The more extensive the porting work done, the shorter the life of the engine.
Heck, you can Peri Port your 13b, put out 200+ hp NA, shifting at over 9k rpm, with doing that, it will never pass emissions nor will it last long. It will idle over 1.5k rpm and cold start will be a killer.


hee hee .... all in all ... that 9+k rpm shift would be sweet :P

 

[atkt]

good info of porting

http://www.turborx7.com/portingpictures.htm

 

[somebody]

Rotary rules no. 777
- Never bridge port your r.e if you still love your STREET ride!

 

[sb3]

To answer sb3, Yes it will give better power is the higher rpms. That is what the porting does. To move the power band into the higher range. Porting for rotary engines are a double edged swords. The more extensive the porting work done, the shorter the life of the engine.
Heck, you can Peri Port your 13b, put out 200+ hp NA, shifting at over 9k rpm, with doing that, it will never pass emissions nor will it last long. It will idle over 1.5k rpm and cold start will be a killer.


hee hee .... all in all ... that 9+k rpm shift would be sweet :P

Hmmm.. Shorter engine life, difficult cold start , not for me.

But 200hp NA, Brap,brap,brap sound and pulling up to 9,000rpm, its very tempting though, hehehe
(Maybe only for trackdays i suppose.)Cheers!

 

[sb3]

good info of porting

http://www.turborx7.com/portingpictures.htm

Hey great porting pics!. But does anyone in MY does such a good porting job ? The last time i 've heard such porting jobs done r by the legendary Gary Chua (Caltex RX-7) and Links power (Somewhere @ Sunway).

 

[sb3]

nah, a crazy friend of mine. now the car rotted in garage for 2 years coz not drivable in city. only fetch his car to track fool around with his evo's car gang.

dude, don try this with your engine. really not worth the penny if u plan to drive in city.

Bro, 'fetch his car to track fool around with his evo's car gang.' . You mean his car can beat the evolution car @ the track?

 

[woaychee]

nah, i dint say that. he is the only rotary driver in his gang. when drive in track, many miracles will happen.. who knows.

Bro, 'fetch his car to track fool around with his evo's car gang.' . You mean his car can beat the evolution car @ the track?