Just curious. I've seen some RX7's at track days and Autocrosses that had a pretty heavy lope at idle.

 

Yes.

A BIG streetport is where the lope begins. Bridgeport and Peripheral port are the Kings of Lope.

 

ahhh...thanks.

 

Mine wasn't particularly big but it would carry on like a bridge/peripheral port if you set the idle up to 1500. Below that it would just have a looope... loooope... looope...

Good for grins

 

I have always ported mine with the exhaust and primaries just slightly enlarged and smoothed up, but using the RB street port template for the secondaries. This gives excellent driveability, just like stock, and pretty good performance. They have always had a steady idle, as you would expect.

For my current 1st gen driver, I was given a set of brand new 12A rotor housings that some guy had ported who didn't know what he was doing. The exhaust ports were so big they were square, no kidding! Well I knew that wasn't right but they were brand new so I built it. I made a custom manifold for an RX4 carb. With a 12 pound RB aluminum flywheel, it idles like a hot rod V8, pretty lopey. The gas mileage seems to be about like all the other rotaries I have owned, and it runs well. But with a RB header and those big exhaust ports, it is LOUD. My exhaust guy gave up trying to make it quiet, told me to turn up the stereo.

 

My bridgeported 13b makes my whole car shake and rumble at idle...Its awsome

 

My SP four port 13B has blips at idle. Then it smooths out at anything above.

 

this is not very common for street engines, but it is pretty common for the exhaust on dedicated race engines.

 

I just put my new large SP in two weeks ago, and it has a bit of a lope. I like the lope, very distinctly rotary. The only downside is that it doesn't like to idled below 1k. That, and the gas milage seems low, but that is likely just a mapping issue that I haven't bothered with yet.

 

if its a descent size streetport, yes it WILL lope,, pretty good too!!!!

 

yay!

 

I just like to say LOPE

 

Lope? In Oz we say they brap.

 

Street ports generally aren't good enough to brap, they just lope.

 

Having a high idle,that braps the whole time,is the only way i want my Rotary to sound!
Gives me a smile each time i hear it.
Karis

 

I love the sound of the bridgeport, sometimes I will start it up just to hear it idle.

Brap Brap Brap!! Got to love it!!

When I had a street port it loped when it was leaned out, but when you added fuel at idle it was smooth, anyone had a similar experience?

 

Yep, I bought a 13b at a swap meet with the tranny for $500 with a RX-4 carb on it. Got it home, installed it and it wouldn't idle for squat below 1500k and it had a lope. A year later I pull the carb and intake manifold off and stuck my finger in the intake port and sure enough, it was a bridge port! I got a holley 650 on the shelf just waiting to go in. Can't wait, the other thing is ........it is loud! I mean plain bust your ears can't think loud. I haven't worked the details on the exhaust yet.

 

Lighter flywheel / clutch / rotors will make an engine lope more

Heavier flywheel / clutch / rotors can be used to hide a street port lope