sen2two

ok...so theres a few street driven PP's out there.



are there any that are carburated out there??? i think it would be pretty hard to tune it down for a low idle and drivability with a holley or webers...



but can it be done???

dubsrwe

i couldent see it beening any worse then a v8 with a .600+ lift cam they carb them all the time. i couldent see to much gunk getting in the ports if you just blocked them off from the outside and even if it did i think it would just burn off in the combustion cycle.

Maxt

Everything that typically coats the secondary runners would just be pushed into there, don't forget the as the rotor crosses the side port, its on the crankcase side of the sideseal..

heretic

When a V8 is running rough, it runs "smoothly". It's crackly but you can drive it.



When a 2 rotor is running rough, it's not smooth, since the rotors tend to "align" with each other. Brap brap brap instead of cracklycrackitycrack.



Plus, most powerful V8s are in front of an automatic with a nice loose converter. it can run like crap all it wants below 3000-4000rpm if the converter has a 5500rpm stall speed, there's a lot of slippage below that point.



That's why NSU's street peripheral port engines were all mated to automatic transmissions.

Maxt

With efi, the p-port is pretty sedate compared to large cammed carbed v-8(440 .509).. I have both and I much prefer the streetability of the p-port, it starts better, idles lower, and burns far less fuel..In terms of noise, about the same..

j9fd3s

the wankel spider is a 1 rotor PP stick, and the engine mounts are very soft, and have a long travel. the engine can sit there and bounce all over the place, without upsetting the car much.

heretic

That's a RV cam compared to what i deal with every day.



One of my customers has something like 264 at .050 and .600" with only 468 cubic inches, but it's totally drivable thanks to the nice loose torque converter, so he drives it on the street regularly. With a manual trans, anything over 230-240 at .050 is a real pain in the tail to live with in city traffic, carbureted.



A peripheral port works out to something like the equivalent of a 400 degree cam with a really tight lobe center...

Maxt

The .509 is 248 at 50, still needs a 4.11 to be livable.. The timing of the pport is location and size dependent, you can do timing like a stock six port, or a full bridge, it just depends what you want to do with it... I have a half bridge and p-port side by side right now, and the pport idles lower, and is less bothered by electrical load.. Everything should be p-ported..

ColinRX7

Nice work Max!



I wonder how my smaller peripheral ports will turn out on the street..

ColinRX7

[attachment=43241:IMG_0839.JPG]



This took alot of waiting but cost me next to nothing. Unfortunately they're still not even completed. Just ported.



I took these housings to a local machinist I know. I told him what I was looking for, and had some aluminum tube stock shrunk with nitrogen and interference fit to the rotor housings. The most time consuming part (the machinist tells me) was milling both housings without breaking stuff. He said he turned the speed way down to avoid chipping of chrome, etc..



Talk to a local machine shop, bring some aluminum tube with you (which will cost you 20 bucks at any metal supplier store), and tell them you want it stuffed in like so. And for how much.



Just make sure you spec out what size ports you want to run, as they rely heavily on the OTHER components you're going to have to fabricate to make the car not just run, but run at it's peak potential.