Can you pass emissions with bridgeport? Also, how long will they last?

no u cant pass and it is said to live a short life. (10,000 miles or something like that) but i have a buddy who drives his everyday and has about 30,000 on it and still works fine. guess it depends on your luck

10k? wooohh....I bet you could get more than then...probably depends on size of bridge too. Your powerband is much higher which is going to reduce life when your seeing 10k alot. Engine mods to help support the higher revving should make it last longer though. I love the idle https://www.nopistons.com/forums/pub...#>/biggrin.png !

brap...brap...brap...brap...brap...brap...



makes me want one so bad.

it wont pass, i think about 30-40k is about average life



mike

won't even come CLOSE to passing emissions...much less noise pollution. There's WAY too much overlap caused by a bridgeport for you to pass https://www.nopistons.com/forums/pub...1047683664.gif

just buy a inspection sticker and give your engine a nice bridge!

and what about noise? Inspection sticker or not, I'm sure that cops will pay more attention to the fact that the car's putting out over 100 db of noisse at IDLE

yeah my buddy worked in an area where they had smog sensors, he had to find the strangest route to work everyday. and ur power starts at 4k, so if u drive with no traffic its worth it. if not u'll be stalling so much because of the shitty idle

the cops around here are more intrested in fresh donuts https://www.nopistons.com/forums/pub...#>/biggrin.png

They may not be able to THINK about donuts when they hear a bridgeported rotary...

your rigth they need coffee as well https://www.nopistons.com/forums/pub...#>/biggrin.png

theyll need donuts...to use as earmuff....... oh my god im so funny



https://www.nopistons.com/forums/pub...1047683785.gif https://www.nopistons.com/forums/pub...1047683785.gif https://www.nopistons.com/forums/pub...1047683785.gif https://www.nopistons.com/forums/pub...1047683785.gif https://www.nopistons.com/forums/pub...1047683785.gif







https://www.nopistons.com/forums/pub...1047683664.gif

Well, cops here don't care

(ricer bikes glow up the street and run redlights everynight)

I heard my first bridgeport yesterday. They are freaking loud as hell! It was on a full-out race car though! https://www.nopistons.com/forums/pub...#>/BURNOUT.gif

any one got stoped for driving a bridge port on the street before?

Can they even do that?



Are Bridgeports not street legal?

bp is not legal in california! u sure do get a lot of power from em though. u also get a shitty idle that might stale at every stop https://www.nopistons.com/forums/pub...IR#>/bigok.gif

Most people don't think about it but with a BP your braking suffers too. Due to there being less vaccum!

https://www.nopistons.com/forums/pub...#>/biggrin.png That's why you get MANUAL brakes

flinstones brand? https://www.nopistons.com/forums/pub...1047683561.gif

nope never heard of that ....some times cop have bad days an try to **** with u so it depends on how much donuts there had for breakfast..dinner or lunch......lol...

heh heh donuts for ear muffs! https://www.nopistons.com/forums/pub...1047683329.gif

Well, there are some things that can help you pass...set your idle very high, like 1200 RPM, place your factory computer in and drive it for a week slowly, use good gas, make sure your air pump and main cat are in....you might make it. I passed with a raceport.

Bridgeports should idle at 1600 rpms...lol...



either way, because of the overlap that bridgeports have, it's difficult to pass emissions. Even if you could pass emissions, passing noise pollution may be a bit difficult as well.

Im getting a street-bridge or sometimes called half bridge. Ill just find a ghetto service center and pay them off for a sticker. I also think the standalone ems im getting well help smoothen the idle. hopefully more than 10k miles guess well see in about a week or so https://www.nopistons.com/forums/pub...IR#>/wacko.png

Hold on a sec here, guys. Let me give you everything I know about bridgeporting up to this point: I've built three streeted bridgeport motors as of the time of this post. All of them are half-bridgeports in that they have the standard, "eyebrow" bridgeport cut on only the front and rear end plates.



http://bdc.genxracing.com/HassanMalik/IM001696.jpg



If you notice where the eyebrow BP cut is made, the space of iron the rotor housing has to sit on (marked in the blackish colour) is left virtually untouched. With respect to the world of bridgeporting, this is the smaller type (but still effective). With substantial metal left for the inner water jacket o-ring to land, there should be no reason why it would only last 10k to 30k miles as another poster suggested. The iron bridge is left fairly thick, albeit wedge-shaped below, and there's no other reason why it would break otherwise. There's plenty of metal leftover for the corner seal and (side of the) apex seal to ride across. This type of assembly requires that the rotors be assembled with the triangular-shaped, corner piece of the apex seal riding on the centre iron plate as opposed to the front/rear iron plates. I also recommend use of the Atkins 2-piece apex seal (or other vendor) so larger, wider eyebrow cuts can be made.



The other types of bridgeporting combinations include cutting chunks out of the side of the rotor just prior to the side seal, cutting into the water jacket area (J-port, monster port, etc.) and sealing the jacket up, cutting into the rotor housing, etc., all of which I shy away from. Once you step into the water jacket, you reduce the life expectancy of the engine. For a turbocharged 13B, I don't think it's honestly necessary at all.



http://bdc.genxracing.com/HassanMalik/IM001698.jpg



The engine from the two pictures above I modified and built about 2 weeks ago. The centre primary intake ports were modified to my large spec. The motor is an old late 80's HB Cosmo 13B w/ 8.5:1 rotors and Series 5-style plates minus the ability to use the teflon/o-ring front cover assembly. The eyebrow bridgeport cuts on it are 1 7/16" long. It's a street car in the most liberal sense of the word in that it is driven on the street, idles at 1200rpm, and drives decently. This particular one is a bit more aggressive than the first one I've done and it requires a higher idle and is more difficult to get running with closed O2 loop. Even though there is substantial overlap, it is still perfectly driveable on the street and still has decent low-end torque and throttle response to warrant it 'street worthy', in my opinion. It's about as extreme as I would personally go for porting in regards to a "street car". The results from such a setup (bit more conservative than the pictures shown above) have netted almost 400rwhp and 330ft/lbs of torque, at 12psi of boost, under 8000rpm, using a TO4E 57trim compressor and P-Trim 0.96 A/R tangential undivided turbine.



For anyone endeavouring to do this, an aftermarket EFI system is *required* unless you're a carburetor freak and know your way around that stuff. Roughly, from a standard or extend ported motor, idle injector timing is reduced by nearly 25% and standard fuel injector timing maps are increased by atleast 15 to 20%. The curves are also different. Fuel cut decel is not used and not recommended.



As far as emissions goes, I honestly don't know if one would pass but I suspect it wouldn't per the dramatic increase in port overlap and scavenging of charge air/fuel, especially at lower RPMs where the emissions testers tend to check.



I hope this answers some questions.



B

https://www.nopistons.com/forums/pub...IR#>/bling.gif https://www.nopistons.com/forums/pub...1047683894.gif

Here's two links to some videos of one of the half-bridgeported street cars I've built. You can hear how they sound, how they act, and the power they can make.



http://rx7.cyberosity.com/87GTR/pics/2003/03242003/



http://rx7.cyberosity.com/87GTR/pics/2003/04122003/



Feedback welcome. Enjoy.



B

Sweet sounding....... https://www.nopistons.com/forums/pub...#>/biggrin.png

Thanks. I've had alot of fun playing with these things.



B

Would this be worth doing on an n/a or no?

Technically, yes, but I'll answer by saying, "good question". We've tossed the idea around quite a bit here w/ a friend of ours that has a Series 5 N/A. I'm fairly certain it won't work with the stock computer, however, so something would have to be done on that end of the spectrum. Otherwise, it'll make the engine breathe alot better so I don't see why not.



B

Judge Ito built a 6port bridgeport that beat a s5 t2, he is running it on stock ecu, approaching 250whp, and you can see the race at vosko's video page



http://www.vosko.net/media

Impressive. What else was required alongside doing the porting job? I would suspect changing the stock N/A EFI system out.



B

I am pretty sure he is running the bp on the stock s5 n/a ecu, I believe he also thinks it is a viable method of obtaining power in 6 port blocks.

I'd like to ask him on the EFI system.



I agree on the power part. I had the same idea a couple of months ago when one of our local guys here was bugging me about doing it on his. We never did it but I always wondered.



B

my friend todd had a bp 13b in an rx3, his was a full into the water jacket bridge (they last about a year before it will start to leak water), it idled all day at about 1300rpms got mid 20's mpg on the way down the sevenstock and ran 12.80's in the 1/4 mile. its totally worth it for an na if you can keep the car light. the rx3 is 2000lbs the s5 na is 2700. he bought an s5 na with the intent to bp, but 2700lbs and 140lbsft is not as good as 2000lbs and 140lbs/ft



mike

ive never seen a bridgeport pass inspection its easier to buy the sticker https://www.nopistons.com/forums/pub...IR#>/wacko.png

We don't know if it'll pass, either. Since these tests are done primarily at lower RPM's, I suspect it'll fail per the amount of time there is during the time when the intake and exhaust ports are overlapping (shooting uncompressed, air/fuel charge directly away from the compression phase and straight into the exhaust).



B