851stgen12a

ok I hear everyone talking about street and bridge port motors, but noone talks about the Perephial port. I know that this port has the most potential to make **** loads of power.

What is everyones thoughts. I am thinking of making a street rod/track car (more track than steet)

thanks everyone

Kenku

At a guess, most people won't consider PPorts for anything that's ever going to go on the street due to their just not working too well at lower RPMs. They're much more suited for track work where you can keep the engine in its 7-10k RPM (or so) powerband.

... this isn't to say that people haven't run PPort street cars. Just not many. Use that search button up in the right corner.

peejay

P'ports cost MONEY. We're cheap people, we'd rather do some work with a die grinder and a Dremel rather than shell out $1600 or so for a couple special rotor housings

SilverRocket

If you want to rev that high (and there'd be zero point doing it if you didn't), you need to do all kinds of other things to the motor. Which = $$$$.

It's certainly do-able, but probably not on a budget.

851stgen12a

no a budget isnt really THAT much of an issue.

Im thinking a 1st gen running GT-3 with a 450hp PP 13b might be alot of fun, and probobly pretty damn competative.

Kenku

Perhaps it would... just don't plan on driving it much on the street if you get it into that state of tune.

851stgen12a

no it will rarelly see the street, but every once in a while you have to kill the unsuspecting Corvette, or Porsche

SilverRocket

Must be nice

You better check the rules... I know for one thing that FD's have to be converted to carburated for GT-3 (or at least used to be.) From what I understand they've thrown the book at the rotary. I'm not sure what you'd be allowed to do.

Sounds damn interesting though... 450 hp sounds extremely optimistic to me, but who knows.

REVHED

450hp is unrealistic. Typical power outputs for a 13bpp range from about 280-300hp with an IDA Weber up to around 370hp with slide throttle injection. Obviously you'd need a very effective (loud) exhaust system to make those sort of numbers.

Zulu

http://sk1llz.net/4rotor-2.mp3



I agree, 450 is a bit high for a 13b PP, I've read on various sites that offer PP 13bs that around 300~320hp is a more reasonable expectation. Then there's always the 20b or you can rob a bank and pickup that R26B mmm, 4 rotor PPd lemans engine.

A more reasonable question to ask would be, how's engine life.

peejay

The highest I've ever heard of any 2-rotor N/A was 380hp for a J-bridge engine with a "design life" of 6 racing hours - good enough for a season of racing between rebuilds.

450hp sounds like BS that has been processed through the "horsepower telephone game" - where everyone adds 10hp before telling the story to the next guy.

BTW did you know that the car I raced last year ran 14's with a stock port engine? I didn't know that either!

karism

Hi people.

Planning to build a 12A Peripheral, with injection.
Please be so kind to assist me, as almost everything will be done by myself, i have access to a milling machine
1.location +size of intake(pics would be brilliant!!)
2.Eccentric shaft modification
3.Exhaust needed(i have a RB header)
4.clutch
5.diff
6.stasionary gears and so on
Will be running Bosch L-jettronic injection, with 735 Bmw airflow meter and bigger injectors

2nd and 3rd generation parts are non-existant in South Africa, so please help.People here dont wan to assist at all, only for LOTS of money

I believe, that 200bhp is possible, when all is done

THANKS !!

Directfreak

iTrader: (2)

...

Directfreak

iTrader: (2)

You don't need a peripheral port for 200hp.

A Bridge-port with a good inatake and exhaust will do that reliably and relatively cheaply if you don't modify the water jackets.

851stgen12a

there is a guy I ran into at a big local road race running a completly radfical 1st gen, with a PP he claimed 425 hp, and from what I saw of him on the track (the whole 2 laps he was out there, before he screwed his motor up) looked like 400hp. I dunno eithr way300 hp in the 2200lb 1st gen is a **** load of power!!

RXcetera

A pport engine on the street is just stupid. You're looking at a rebuild on a monthly basis, a non-existent idle, NO power under any kind of streetable RPM, serious noise issues, your mileage would be horrendous etc etc...

I dont understand why some people on here keep having these "ideas" that have actually been tried many times before and proven not to work. You arent being different by running a pport on the street... you're being dumb. The many people who do run pports on the track would tell you exactly the same thing.

The long proven limit for street use is a bridge port with a big carb (or aftermarket FI) but even this setup is far from durable. A good SP setup is good for ~300hp... why would (how could) an SA/FB need more than that on the street? Even with the BP the car would be borderline undriveable in real world situations.

WackyRotary

I got a bridgeport and drive it pretty often on the street. BUT, I do not live in a large city so I spend most time at highway speed and VERY little in stop/go traffic. Ocually I drive in these type of situations, but even then I wouldn't say its not drivable. However it is semi-loud which is the main concern of mine when driving in town.

The final issue is smell!!!! I try VERY hard not to let a cop or anyone else stay directly behind me for too long because the exhuast is VERY VERY Potent!!!!! I drove behind mod'd Rex's with no cats and WHOW!!! Man does it make you sick after a bit! JEEZZZ!

Anyway, my bridgeport doesn't have much below torque below 4000rpm, however, even in first gear, its relatively easy to spin up to 4000 and grab the power curve from there. The other issue is choppy idle, it vibrates and shutters at part throttle at low speeds, like below 55mph and when coasting.

REVHED

Absolute rubbish. I know people who have ran pp's on the street and the engine's have lasted well over a year. This is with driving the car every weekend (obviously you wouldn't drive one every day) and giving it a very hard time. Also, depending on the size and shape of the ports they can make good power from relatively low rpm. Hell my extend-port doesn't kick in till about 4500 either. And lastly, whether you believe it or not a 2000rpm idle is still an idle. You are right about the noise and mileage though...

BTW, since when has an SP made 300hp?

diabolical1

iTrader: (3)

i totally agree with rxcetera on everything but the rebuild regimen. i know people who have run them on the street for quite a long time without having to rebuild (like revhed said, they aren't daily drivers!) - so we're only talking about weekends. however, the BRAP! BRAP! BRAP! assault on your chest and eardrums with a 2500 RPM idle, no gas mileage and high RPM powerband make them a rather dumb idea for the street. but that's my opinion, i guess there is always someone out there that is willing to live with that ...

and yes, the 400+ HP thing is nonsense!

Re-Speed.com

iTrader: (3)

You would be classified in GT-2 rather than GT-3. Bridgeport only in GT-3. You see most rotary powered GT cars running in GT-3. At the runoffs there were 11 GT-3 mazdas and 1 GT-2 mazda this past year.

Also, it will be very difficult to compete with a tub car in either class. Have you thought about E-production with a street port? You could build a no compromise competitive car that was also used on the street SOME.

RXcetera

2000+ rpm is NOT idle. Please find me a PP engine that make "good power from relatively low rpm".

You guys are right about the durability... if the car is only driven on weekends, then sure the engine will last longer. This kind of goes against the notion of a street car though. I guess my notion of what constitutes a real world streetable and reliable car is different than yours.

Sorry about the BP bit... I meant 250+ hp .

851stgen12a

no im not worried about streetability, it will only rarely see the street, the main purpose is as a track car. and your right, just checked the rules Bwaits

PaulFitzwarryne

I agree that maximum is about 330bhp.

It will be :-
1. very expensive with numerous modifications such as dowelling.
2.have no real power under 8,000rpm.
3. have a very high idle.
4. extremely limited life.
5. require a exhaust system with minimum noise reduction- no hope of street legal.
6. be unable to pass emission requirements for registerable street use.

However go ahead if you:-
1. have a wealthy relative who will indulge fantasies.
2. own your own race track.
3. want to own the highest output 12A NA around.
4. like the idea of 300+bhp at 9,000rpm

peejay

Have you ever driven one on the street? Or talked to people that actually have?

Don't forget that ALL NSU's were peripheral port. They were tuned for midrange grunt. 130hp at 6000rpm from a 10A-sized engine in stock trim.

karism

Mmm, ok.
I cant do a Bridge port,the streetport is too big, and the sideseals will fall out, thats why i`am going to do Peripheral.It wont be a daily driver at all, weekends, and drag meetings, mostly.

2500rpm idle doesnt bother me at all, seeing that it idles at 1800 at this stage (70deg streetport)