People tend NOT to port Turbo rotaries (i.e all the FD and FC rx7's, rx8's etc). Why is this? I thought it's mainly because of the sound (turbo muffles the sound I think??) and that they just sound way more rowdy in n/a form? Or because there are more complications than porting an old 12a N/A rotary (heard you have to get a new ECU etc etc)? Or is it just purely because your getting good power gains out of the turbo to not even bother with porting?

 

People get good power out of normal port timing. Hence most leave it alone or do "token" misguided efforts mostly based of a massive miss understanding of timing and its effects.



This is some pictures of properly ported turbo engine with correct timing that yields much higher power, and more peak engine speed (all other variables held constant)





























two different specifications of porting







stock V's ported (hand marked plates, if you look close you can see scribed ref lines)

 

most people don't setup the engine to take advantage of even the stock ports, let alone something bigger...



people make 400+hp on stock engines, with bigger turbo's ecu's and all the other stuff.

 

Hi Rice,

Allot of shops aren’t willing to share their porting pictures, so well done it’s nice to see some picture of how the pros are doing things.

 

Where im from, New Zealand, there are alot of rotaries. Lots and lots of people tend to have old skool cars with a rotary engine in it, and get it ported purely for the sound. You see lots of non-genuine Mazda Rotaries (323, 626's) alongside the genuine ones like RX3's etc etc and Toyotas (early 70 and 80's Corollas are most common - I myself have a '79 Corolla KE30 with a 12a Bridgeport engine) and other old RWD cars with 12a's and 13b's.



However you don't see too many turbo rotaries with porting



I think down here its what we do, love the rough rugged sound as oppose to getting power out instead.

 

I find its just flat out allot of hard work (to do an acceptable job) and these days with the internets/furums and digi cams everywhere people are maybe a bit more reluctant to show their work (or be proud to have their name to it). I dare say sadly more would be ashamed, rather than hiding any special technical attributes thus they do not exhibit their work.



With turbocharged cars it is easy to make power on the stock standard ports or ones with a little tickle here or there, ultimately its not as nice an engine (as I described in first post) but it gets the job done for nearly all applications you care to nominate.



Nice street port job is majic though and you don't know what you are missing out on till you go in or drive a nice one.

 

[youtube]http://www.youtube.com/watch?v=BcLGr-iQ_Hw[/youtube]



What the above porting sounds like *testing my new scope and checking spark burn times on the CDI coil on plug set up*

 

Hey Peter, how do you like the PC based oscilloscope? I just ordered my first scope up and i cant wait to play with it

 

I like it allot, I thought it be be totally beyond me but for the money the PICO gear is fine. It works and apparently can do things lots of others can't do and for a newb of electricity like me its a winner



what kind are you getting?

 

It's an older (92ish) 25mhz analog scope made by a company called Heath. It's not the greatest in the world but hey, for $36 you can't go wrong. I bought it mainly to set up my hall effect sensors.