rx-7 porting

[ymb honk]

i work at a machine shop so porting and polishin along with repalcing cams are no problem i was wondering what would make the biggest diffrence hp wise?

[walterdixon]

uuummmm, rotary engines don't have camshafts.

As for porting, a street port will give you considerable gains in hp and is well worth it if the engine is already being rebuilt.

[Chris V]

http://www.rotaryengineillustrated.c...-ports101.html

Gives you the best info on ports and porting I've found.

[illest7]

a nice street port can see gains of 20% in hp

[Steel]

Well. If you wanna go totally crazy get a periperal port. but that's for race only vehicles. But they're crazy. Bridgeports give big gains, but dont last very long. Standard streetport would be best.

[illest7]

Ive seen some peripheral ports that run better than a poorly done street port... Its not a race only application. They can definitely be streetable.

[Steel]

a streetable pp?

if you think an idle of 2k RPM, and having the powerband start at around 5k RPM is streetable. Not to mention emissions.

edit- As i've said before, i like to call the pp the "Ridiculous amounts of overlap causing pretty much loss of all low end power and torque-port"

[illest7]

I didnt say "convenient to drive daily" I said streetable

[Steel]

lol, well streetability IS convinience to drive on the roads. Hell, a funnycar can be streetable, just extremly inconvinient to drive down the street to get a pack of smokes. Plus im sure funnycars arent smog legal either.

[dayna240sx]

Originally posted by Steel
a streetable pp?

if you think an idle of 2k RPM, and having the powerband start at around 5k RPM is streetable. Not to mention emissions.

edit- As i've said before, i like to call the pp the "Ridiculous amounts of overlap causing pretty much loss of all low end power and torque-port"

This is the beauty of my C-port... low end power, smooth, transistionless powerband.. near stock idle, but a PITA to get the engine management tuned...