This is a Port I recently did for a customer. It's a pretty wild ported secondary side housings and a mild port on the center housing. I posted this pic to keep giving people an idea into porting. Remember that besides changing port shape you also need to change port volume inside the tunnel of the port.



First a pic of the stock port.

 

Large streetport more then 30% larger towards the intake opening.

 

different view part II

 

How much of the corner seal is supported still? I'm trying to compare this to a bridge in my head and it seems you've removed most of the material you would normally leave for the bridge itself....



Can you post a comparison pic?

 

1/4's of the corner seal is supported by what is left of the port wall. I've done this type of port for another customer.(I won't say anynames ) but this port makes nice power throught the low,mid and high RPM range. This type of port has landed 700rwhp on 32lbs of boost with a 150 nitrous shot. to Xtreme of a wild port..

 

Beautiful



Does it make good low/mid range power due to the "mild" porting on the center plate and huge top end due to the size of the secondaries?

 

Yes Mr. Justin. I like to call it the best of both worlds. Mild and wild street ports.

 

excellent!





Judge, do you have picture of the runner of that port. like you said, the shape of port open matters, but the shape of the tunnel/port matter a lot too.



My understanding is that the tunnel/port runner suppose to shape like air nozzle which has throw/choke point and discharge/divergence. the area of throw/choke point determines the max amount of CFM(Velocity x Area - Losses) before it choke.



the way you shaped the port opening or should I said the way you shaped the discharge section matchs to my ideal port shape for discharge, that I had in mind. It will be nice to see how the master shape the tunnel!!

 

Strange. This is the only pic I could find showing the beggining of the port runner. Ill take a pic tomorrow and post it.

 

You do mean that 3/4's is unsupported right? I have a port that I did down at the shop that only supports 2.5 mm of the corner seal. I was scared shitless when I ran it. It was fine though and eventually I decided to try something different. Everytime I build a motor for myself I try something different as far as porting. I like being able to see the differences for myself.



Very nice port by the way. Now I want to pull mine apart and try something else.