Linguo415

iTrader: (1)

I know a lot of you have street ports done on engines. Who has a large street port out here? How is the drivabilty? How would you say it compares to a mild street port? I love how it sounds.

3vil

iTrader: (4)

the motor i put in "allegedly" has a more aggressive street port. i say that only because it was built by Hayes like 10 years ago, then sat in a garage for 9 years never installed before i got it. by the time i did get it most all the invoices and other paper work was long gone.

as for the driveability, i have more problems with all the **** around the motor than i do with the motor itself. it makes decent power for an N/A, is pretty loud with the racing beat exhaust, and for the most part is pretty reliable. like i said, all the other **** around it, BAC, fuel system, TB are what give me headaches.

i doubt that helped you at all, i'm sorry

K-Tune

iTrader: (26)

my intake ports are quite large, though i didn't do a lot of runner work to keep the port velocity up. My idle is relatively sane, but my powerband definitely favors the 5-8k rpm range.

Besides the low vacuum that it pulls my car doesn't sound ported at idle.

Furb

iTrader: (2)

worthless question..

all depends on the entire setup and how it was ported.
there can be a lot of difference between a streetport and a streeport

Linguo415

iTrader: (1)

Well larger porting supposedly makes for low vacuum. Could this be the issue?

Linguo415

iTrader: (1)

lots of differences between a streetport and a streetport. If your ganna call a question worthless have a good explanation please. This question is about mild vs large streetport drivability. Not port detail.

Linguo415

iTrader: (1)

I see. So how does it perform below 5k? Does it drive normaly?

Linguo415

iTrader: (1)

How do your cars drive uphill form a stop? Do you have to rev them high?

RotaryEvolution

iTrader: (30)

actually he was correct. not all builders use the same templates or porting techniques.

for example you may have a builder do the engine who calls a large streetport what another builder would call a mild or moderate streetport. another builder may work on airflow path more than how large the port opening is and call it a large streetport. then there is exhaust porting, some make the exhaust more oval shape and retain the trailing port timing to retain the torque where others will cut the openings more square and long for a shift more to the upper power range which causes a rougher idle.

so you see, it all depends on how the engine is ported, but for the most part ALL streetports sound the same, very stock-ish. the only ports that have a very noticable signature are bridgeports and peripheral ports.

although all streetports have a mild and tame sound, they do not all perform the same.

i for example work on the airflow path, bigger is not better IMO and i have seen plenty of butchered irons that people bragged about, air does not have a tendency to want to work backwards. nor do bench airflow tests work very well on rotaries since the airflow is affected by 2 things, boost pushing it through and resonance in naturally aspirated engines causing pulses which disrupt airflow. each port style has it's benefit though but a better example would be the renesis versus the S4/5 non turbo engines which have a max potential power output range of about 200WHP without extensive portwork, the renesis makes 215WHP on stock ports, although with a more extensive intake runner system that is aside from the point that the scavenging effects of the side exit exhaust port allows it to make more peak power where peripherals take to forced induction applications better. if you airflow bench tested a renesis it would fail miserably to a ported S4/5 non turbo rotor housing exhaust port but yet it makes more power..

Linguo415

iTrader: (1)

brap brap brap brap. thanks Karack. I was talking to my buddy today and he says he runs kinda rough and has to rev real high when having stopped on a hill and its loud. he said its a mild streetport. who the hell do you listen to? lol They should just call them ports. Then bridge port, j port and then periport.

sharingan 19

iTrader: (16)

Streetports don't "brap brap brap".
They DO call them street ports, bridge ports, and p-ports...respectively, but you didn't ask about those, you asked about street ports. Karack said pretty much all there is to say about the difference between various street ports.

How bout you explain what you're looking to use the motor/car for and perhaps people will chime in on what style of port and associated modifications will best fit your needs....

Not sure you who should listen to, but a guy w/ a Brap-ing street port.....prolly not him.

3vil

iTrader: (4)

for your questions about going uphill from a dead stop. my car behaves pretty much like my old 86 integra did. you rev the engine a little higher to keep from rolling backwards, and continue to apply throttle as the car begins to move.

as for your buddies loud car, does he have the stock exhaust in good shape, or some headers and free flowcats/presilencers? straight piped n/a's are can be pretty loud.

RotaryEvolution

iTrader: (30)

streetports really don't add that much noise, removing the exhaust port "wings" on the n/a and opening up the exhaust fully will make it ear bleedingly loud but that isn't mainly due to the larger porting.

if your friend has a streetport and it is idling lumpy then it probably has issues it needs sorted out, that isn't a typical way that streetported engines behave unless it was ported VERY aggressively. i'm still leaning on that example just being a poorly assembled and adjusted engine that has the timing off, needs a tune up, fuel output out of spec for engine needs, vacuum leaks, weak compression on a rotor face, yada yada yada.

jjwalker

Rotary Performance cut the baffles out of my new rotor housings and ported them.

Got WAY louder.

It was a new engine, so power gains where to be expected, and we only ported the exhaust side. It did move my power band on the butt dyno up to about 4500rpm from your usual 3500 on a stock NA. With my power goals and plans, porting the intake ports didn't make any sense.

Linguo415

iTrader: (1)

No i wasnt asking about the bigger more extreme ports. i was brap brapping about Karacks mention of the bridgeport. but Nvm. Since you ask what I will use it for. It will be for dd/ some track use. I live in a place with lots of hills and lots of street lights. I am also T2 if this makes a difference or worth mentioning.

Linguo415

iTrader: (1)

Haha. He has a turbo back Racing beat exhaust. So its straight pipe with no cat. He said its a bit louder. Ide heard t idle and its not super loud or anything.

Linguo415

iTrader: (1)

he just rebuilt it and deleted all emitions. So hes having some issues because of this. Perhaps this is part of it.