Hello, I was wondering on the reliability and the power of doing just a mild port on a S4 N/A with stock internals. A n/a s4 motor has 146hp? Where would I roughly be afterwords? Thanks

 

i can't really think of anyone not using stock internals they were really well made pieces. what ports all of them front rear intermediate aux exaust? or just a few?

 

Stock internals are good for as much as u can throw at them.

 

i think theres race rotors out there but all that race stuff is for...racing and being torn down after every race like those crazy apex seals that last for what maybe 3000 miles

 

Is the motor still in running condition?

 

Keep in mind that the S4 n/a's 146 horsepower is measured at the flywheel when the car was brand new. It will be way less at the present time, measured at the rear wheels, like barely over 100 realistically.

There's really no way to guess how much power a particular port will make without knowing the exact specs. Even then, there are so many other variables to the equation to reliably guess. All I can tell you is not to expect much, peak numbers-wise. Concern yourself more with creating a strong, useable powerband. Peak dyno numbers are good for nothing but bragging rights.

As far as the 'stock internals' thing goes; the only thing people really upgrade is the apex seals, and I'd stick to OEM ones for most applications. There are some exotic internals out there (aluminum rotors, 2-piece e-shafts, etc), but they're really expensive and definitely not needed on 99 percent of rotary engines out there (probably more than 99 percent, actually).

 

I understand what your saying, the power gain that im looking for is going to be reliability power for a daily driver. So ill be a happy camper at 200+hp and then just have a fun ride. Thanks for the info!

 

Search Karen's old threads.

 

200HP NAs are very rare.I only seen a couple of then reaching that mark without getting into a exotic port jobs,ITB,standalone,modified intake manifolds and so on.It can be done but dont expect to do a streetport,headers,exhaust and intake and get 200HP like that.

 

for clarity, is that flywheel or drive wheels? if it's at the drive wheels, i hate to say it, but you'd probably be better served with a T2 swap. as was said before, it has been done with the 6-port block. however, the road ahead will be long, hard and likely quite EXPENSIVE going that route. it's also arguable that the daily driver aspect will erode quickly, given the powerband you'll probably be left with.

 

take a look:

https://www.rx7club.com/showthread.p...ght=streetport

https://www.rx7club.com/time-slips-dyno-128/na-streetport-6-port-dynoed-182whp-details-inside-416012/