[4v6]

Just been looking back through my other stuff to see what i had that can be used here.

In the past ive worked on toyota heads, mainly the v6 camry motor to get some good improvements on it and most all of what i found with those is directly applicable to our 20 valve motors.

Sometimes the best way to get an inside angle on something is from the er...inside, so i started out by making a port mould in silicone of it.
This is absolutely stock and as you can see its rough and very uneven, has all sorts of casting imperfections and edges.

Side by side comparison of a reworked port pair vs that stocker.
Notice the short side radius thats pretty much lacking from the original item.

Btw, the client who received these heads got his motor dynoed.
Stock these v6's are 185bhp he got 215.8bhp and a similar hike on torque so it wasnt wasted effort.

The exhaust ports on these are quite horrid also, with two out the three pairs having a dog leg, the final one is just siamesed as is normally found and flows around 10 cfm more just because of that.

I did a little experiment with some smoke drawn into the port to see if i could video it or photograph it and get a bit of extra info.
This photo is a good one i think as it clearly shows the pressure of the air being deflected around the guide boss back out into the central flow of the port.
You can see that lillte "bump" in the smoke that follows the contours of the guide boss.

These others are seeing where the air wants to go as regards the short side radius and splitter and how it impacts on the air as it flows past, all very backyard i know but still fun to see and do and you get to actually "see" the flows.

Hope this is useful to someone.

 

[my2000apb DrBeastCar]

cool im uploading my 24v vr6 porting pics and will get them up later today

 

[PRA4WX]

Awesome stuff!

 

[aantoxa]

With any exhaust you want to have the manifold at the face larger than the port so you have a step that discourages backflowing during overlap, pity the stock item is the wrong way around!

:thanks:
Love your right up and thank you for your information sharing.
Here is our CNC'ed FSI heads. We always tell peole to make sure your exhaust manifold has a 1.5mm larger radius than that of the cylinder head exhaust manifold port. The only time we ever gasket match the cylinder head to manifold is on a supercharged application.

Too nice! How do you like them Ferrea valves?

 

[Rossi46]

 

[varia]

Few from the guy who does my head

 

[JamesBufkin]

Here you go..

 

[paradox11235]

Damn this thread, now i want to port and polish my head... Gotta see if there's anywhere to get it done.

 

[Wizard-of-OD]

Too nice! How do you like them Ferrea valves?

Unquestionable quality. Ferrea gets it right everytime.

 

[Kuma]

Question, how do the trumpets differ in performance? say over just a regular manifold?

 

[Phabio14]

Hey There,
This might be a stupid question, but where did you get that cylinder/ valve cover? It really looks amazing! Awesome build by the way. Thanks

 

[Durr McDanks]

Sex picnic

 

[blackghost]

This is very good information. Thanks for sharing!

95.5 black on black urs6 avant fully loaded with all of the goodies.

 

[jay54f100]

Awesome pic

 

[thegreasemonkey]

Does anyone know a shop or individual who does CNC ported 20v heads for
a reasonable price? Looking for under $2k if that's even possible.

 

[varia]

Costa Mesa R&D
www.engine-machining.com/
123 Monte Vista Ave, Costa Mesa, CA 92627
(949) 631-6376
His name is John, and he is the man.
He wrote few books about lathe, mill, cnc,

the other one:
Port Flow Design
1583 w. 259th st.
Harbor City, Ca. 90710

310-257-0351
http://portflow.com/

 

[blackghost]

There is the guy from the 200mph s6 Bonneville car. I think he's four rings performance. My mentor Dave Storlien of Porting Dynamics in MN just retired. He was a full service guy. Not just porting but serious about the tune-up and cam selections. I learned so much from him.

95.5 black on black urs6 avant fully loaded with all of the goodies.

 

[blackghost]

Wait... NVM. CNC ported. My friend Dan works for a company called Raven Works in Minnesota. They've got all the equipment for R&D and CNC. PM me to get in direct. contact with Dan.

95.5 black on black urs6 avant fully loaded with all of the goodies.

 

[Wheeljack]

Hank at Iroz Motorsports in Las Vegas offers a CNC ported R5 20V head based on the FRP Jeff Gerner design.

 

[audifreakjim]

I can vouch for Costa Mesa R&D, they did the machine work in my 07k. But, I would talk to Hank. Those cylinder heads are amazing.