Well, I am rebuilding my engine after a recent dumbass attack; that is, running 15 psi with the stock fuel pump. Don't freak, its not as bad as it sounds. I have a drawthrough so the fuel pressure is not an issue, but supply when flooring it for long periods of time is (the float bowls eventually get sucked dry and I end up with mad detonation). So, I cracked her down last night and I had the cracked rear cast plate at the upper dowel pin, and I broke 2 of Atkins solid corner seals (which I find very odd considering Coldy13 detonated his engine and broke a side seal and not the stock corner seals).

Anywho, I am contemplating a bridgeport. If I dont bridgeport it, I will definately street port it. Does anyone know how bad it's going to be for a daily driver? Will it suck *** to start from a stop? Oh yeah, I have a lightweight flywheel on the way (I believe its 13 lbs), so thats another thing to think about on the launch. I know that bridgeports are really good for a higher revving engine, but being that I am turbocharged, and a decently sized one at that (about the size of a T-04 E), it can flow that port size. Thanks for your input.

 

I'd go for a big streetport. When turbocharging a Bridgeport, you have a good chance of blowing out the bridge sooner or later (and probable sooner then expected)
I'm not aware of many BP turbo'd engines, so I guess that'll have a reason. The bridge is already the weakest link, so I wouldn't put extra stress on it.

 

street port is drivable, not to bad. It's like driving a really fast car though lol.

 

yeah, ill do the street port. Its not worth bridge porting, especially considering the poor drivability of a bridgeport and the fact that its carbureted (drawthrough turbo at that). Plus, I dont want my engine to blow again anytime soon lol.

 

well, don't let drivebility put you off. Reliability should
People tell a lot of tales about BP and PP, but even PP is streetable as such. It's just most PP's are build hardcore race-prepped. But the old NSU engines were PP and they weren't at all undriveable. The very early ones were a bit unreliable, but that's all long solved (now 100.000miles on a PP NSU are "normal"). So all porting types can be turned to a streetable engine.

 

I was thinking about doing the bridgeport turbo thing, but decided on a 120 shot instead.

 

i have a bridgeport turbo.....the best way to explain it is.......with a bridge turbo when you get to high rpm's(above 6k) it feels like the second turbo kicks in!!! nothing like it!!

as far as driveability goes, its **** and plan on using tons of gas, its worth it if you ask me

 

If you live in Cali, forget about it! I think my RotaryShack street ported 12a turbo will be plenty!

Hint hint!!!!!!

I can not wait!

 

I'd go bridgeport but keep it n/a. You guys gotta admit that theres nothing like the sound of a n/a rotary at aroun 9000-10000 rpm.

 

I always wanted to PP my 12a, build the internals and get some lightened race rotors so I could run at 14K like the IMSA cars did. Wouldn't last for a goddamn, but it would be fun while it lasted.

 

Overlap and forced induction don't usually co-exist without some fairly major work. If you want power, get a large street port with no overlap and slap a T04-s running 15psi or something. If you want noise, unreliability, excessive fuel consumption and roughly half the power, get a wild bridgeport/J-Port.

Admittedly, not all bridge/J's are completely impossible to drive below 3000rpm, but the good ones are. Even quite wild turbo jobs are quite driveable at all rev ranges.

 

Turbo Bridgeports kick ***, however, the power band is very narrow, compared to a streetport turbo.

I have experienced both. The bridge sucked *** around town driving, but really shined when racing and running biiig boost.

 

I agree with 680RWHP12A. Bridgeport turbos are awesome.

It is not any harder than driving an NA bridgeport around.

 

Admittedly, I've never tested a bridgeport turbo with my "seat-of-the-pant-o-meter", but if it's anything like driving a n/a big bridge (of which I've owned two, and driven over 60,000 miles in) then it's hardly easy to drive and I can't say with confidence it's an image (noise.. noise.. backfiring.. more noise.. did I mention the noise?) I'd want to perpetuate now I'm 25 and not 17 anymore

I henceforth withdraw my previous comment regarding fuel consumption. All rotary engines consume fuel in a manner that makes an Iraqi oil well fire look tame and the 17 y/o in me is screaming "you drive it for fun! don't look at the fuel gauge!"

 

what brand turbo? wat about using a TII turbo on a 12aBP running stock boost?

 

the guy i bought my car from said that it has a bridge port, and it's a 12a in an '82. It idles between 1800 and 2k,, and anything below 3k it starts to get jumpy when cruising, but up around 7 or 8k rpm, it really pulls nicely. I'm afraid to take mine above 8k because of the possibility of seal chatter. as far as turbo'ing a bridge port, there is a guy in the 3rd gen section that posted a video of his bridge ported T78 car, and that thing screamed. went from 3k to 8k in less than a second, in second gear.

 

Imagine trying to drive any car with a potato stuffed in the exhaust the back pressure soon kills it, that what running a S-4, or S-5 turbine on a 12a or 13b bridgeport would be like. these engines BP/PP require race level exhausts to spin up as NA's something with a "P" trim wheel and a 1.15, or 1.32 might work well and truly extract all of the power a turbo bp could make but any less and you would be just as well off with a street ported turbo.

kenn

 

do a "half-bridge", you get great street drivability and amazing top end. put a 70mm turbo on there with atleast a 1.15 "p" trim turbine and you will never look back. altho, you are carb'd so.... nevermind. to really tune that sucker you would need a haltech ( and this is coming from a turbo carb'd 1st gen owner too ). a nice large streetport would be plenty. go big on the exhaust ports so you spool the **** out of your turbo. and you might want to think about getting something bigger

 

Just thought I would tease you with a little video of my bridgeported 12aT idling in the driveway. Enjoy.

http://rapidshare.de/files/3965198/b..._idle.AVI.html

 

hell yes! sounds awesome, idles alot faster than most i've been around but definately a bridge none-theless!!! hahaha. one question.. if you are using a 12a with TII intake manifolds and the plate adaptor to make them fit.. . what did you do about the injectors that normally go in the housings?

 

The fuel injectors are in the centre plate like a 13bt. It is only the oil injectors in the housings. I have blocked those and I premix oil in the fuel.

 

ohhhh niiiiiice. man i'm loving your setup more and more everytime i ask you a question

 

And another small video. Not my fastest run but close to it.

http://rapidshare.de/files/4030600/b...-12aT.mpg.html

 

best post EVER