I just wonder then, street and race port how is the difference? Which one is the loudest because I have a mid-pipe.. So can you give me some more information about street and race port..

 

never heard of race port. the rotary is already loud. keep thick mild steel for your exhaust. I think RB lists 16 gauge. forget loud why are you porting with only a mid pipe. what is your local shop. why not single turbo the monster and switch to a stand alone ecu. porting is a mod that comes further down the line. u

 

You'll only notice the gains of a street port when you have an unrestricted air flow. Meaning intake, DP, MP, exhaust, but the porting will increase HP compared to a non-ported engine. You'll notice the most gain when you run a single turbo with the ported engine. If you plan to drive your car on the streets I would recommend getting the street port instead of the bridgeport (race port). The bridge port will cause a very rough idle and the gains are only top end power.

hope this helps
Tony S.

 

This is also what I have heard. My engine is street ported so it has lost a little vacuum at idle and a little torque off the bottom. Unless you plan on keeping the engine on boil all the time don't bridge port the motor.

 

porting the engine is like putting a cam in a piston engine. street port "mild cam" will give you good power all around but bridge port "big cam" sounds sweeeeet. loose low end but have a better torque curve and sounds sweeeeeet.

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in japan most people bridge port to get more torque compared to street port. i have driven bridge ported cars and i am getting redy to do mine and when tuened right are drivable.

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All of the bridge ported turbo motors I've done have actually made more Power and Torque in the power band.Normally that's between 5000 to 8500 depending on turbo setup.The only down fall of the bridgeport on the street is that it has lower power and torque during part throttle cruising and you have to deal with the higher idle and very bad fuel economy but it sure as hell sounds sweet and once it get into boost it don't stop pulling.
Hey Gordon I'll send you a copy of a dyno run of a BP turbo motor and give me your opinion of the power band.

crispeed
87TII
9.67@141mph

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One of the nice things about the BP motors when it's done right is high HP and TQ with a wide power band at low boost.For example 522RWHP/480RWTQ at 20psi on 93 octane.Just about everyone down here around me is also either BP or Semi Perifferal ported.

crispeed
87TII
9.67@141mph

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crispeed those numbers you are talking about is that with nos or just turbo? and who drives a 7 for the gas mileage and crusing around at half throttle any way??

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I have dyno runs from the same motor street ported vs bridge ported and the only difference was that from 4500 rpm to about 8500rpm the Power and Torque went up by 30 thru the entire powerband.All this is also dependent on the port timing also.
You know how it goes!
Every street is different and so is every bridge!

crispeed
87TII
9.67@141mph


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crispeed
87TII
9.67@141mph


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What is going on here!

Soon there will be NO "secrets" left...

I think BP's and PP's are a **** idea and none of you guys should be even considering doing such a foolish modification...lol

Turn my back for one second and everyone is catching up !

 

Tell me about it!
Some fellow racers from Texas this weekend got to witness the power of the PUENTE!
When I told them on one of my 9 sec runs I was only running 22psi with no juice they could not believe it.I just don't want to let out any more than they need to know though.Can you imagine the power of the PP motor.
Or yes and as Racing Beat said and I quote:
" Don't consider BP or PP for your turbo motor because it will make less power and is more prone to detonate because of the high overlap of that type of porting"
Like someone forgot what HP is all about.High HP=High airflow+overlap.
Yet the same year they brought out the salt flats car with a BP motor in it and the next with a PP in it!!HE HE HE HE


Don't worry there's still a lot of secrets left!
It's your choice to believe or not to!
I don't have a clue what I'm talking about!I'm just quoting what I read in the factory manual

crispeed
87TII
9.67@141mph

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[This message has been edited by crispeed (edited May 23, 2001).]

 

[This message has been edited by crispeed (edited May 23, 2001).]

 

cris can you e-mail me a copy of that bridge port dyno please
rowdyrotary@hotmail.com

Cheers
Shane

 

Hey Chris,
What do you think of bridge porting the secondary ports only ???
Ran my motor (half) bridge ported for about 8 months and it made decent power in the mid but upstairs it pulled hard.... just could not deal with the crazy idle !!!!!
back to street port I went....

John

 

whats the dealio with the pp port? how does that one work? are we talking bp with high or low compression rotors? i want to be the first "gaijing" in japan in the 9's so hook me up with the goodies!

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Side Ported - ORC twin plate clutch and lightweight flywheel-ARC "GTR" intercooler

 

For a better explanation try here

I myself have just go into this whole rotary engine thing and have found lots of great resources out there to help (and that are accurate).

--
89TII
My Site

 

So who does good BP work? Alternatively, is there a shop/tuner that can sell me a quality BP/SP motor? Thanks!

 

Well, I miss the PP I used to drive to work everyday. Back in the days before the import perfomance scene (around here). It was so simple and the only old school import around that demanded respect. Just a Weber on top and some MSD's etc. Now I want to build another fast turbo car. PP sounds like fun. Ppl told me that a pp wasn't streetable, but I drove it quite a bit to and from work. I guess it's all in what you would consider streetable. I had a VW diesel (n/a) that I would consider less streetable than the PP due to the fact that you would almost always get creamed from the rear when trying to merge onto the interstate! Never a problem with the PP. I would also say that torque curves are subject to individual scrutiny. For some ppl a flat curve is what they are looking for. Some of us don't mind a curve that looks like the Washington monument. It's all in what you want to do with it.... oh, and ya gotta love the mad idle.... Just gotta figure out how to keep the end plates from cracking.
Don.