Cut open the 12V head

[wagoneer]

Since I want to do head porting in my new engine build, I was needed a bit more information about 12V head.
To find out what is going on inside the 12V head we need to just cut open it.

 

[12VALVEADAM]

Why did you have to cut it open? was it a junk head to begin with?

 

[Red_Rattler]

To see wall thickness and how close passages are to things... And yes I'm guessing it was junk LOL

 

[Tacoclaw]

I bet it owed him money.

Cool pics, thanks for sharing!

 

[young12valve]

I bet it owed him money.

Cool pics, thanks for sharing!

Thats what i figured to!:lolly:

 

[12VALVEADAM]

Cant say I have ever seen one cut up, but yes thanks lol

 

[cumminslow]

i can weld that head back for you

 

[wagoneer]

Well its only way to see the wall thickness and how close the bolt holes and water jacket are.
My friend AsTross was donated this head for motorsports education :bow:, because we both want to make some porting job on the head. And this is the best way to start it. :evil

 

[seeker1056]

one of the biggest concerns is the water jacket between the two ports.
a slice cross ways through both ports directly across the valve stem holes to see the shape and thickness of that area would allow for much more material removal in what appears to be a significant flow restriction

 

[AsTroSS]

What You have done to my cylinder head ? :soap::soap:








:lolly:

No problem, I have still 9 Cummins 12V cylinder heads in the shelf, good to have some extra parts available.

I think those pictures are the fist cylinder head cut half pictures in Internet after Piers originals back in 2005.

More pictures with measurements will follow..

 

[wagoneer]

What You have done to my cylinder head ? :soap::soap:
:lolly:

No problem, I have still 9 Cummins 12V cylinder heads in the shelf, good to have some extra parts available.

I think those pictures are the fist cylinder head cut half pictures in Internet after Piers originals back in 2005.

More pictures with measurements will follow..

This happens when you bring your stuff to my place :badidea:

 

[billfahl]

Keep the info coming...

 

[Fahlin Racing]

They sure didn't make very large ports from what I see. First time seeing a port of one of these heads, thanks for posting! I will be keeping an eye on this thread.

Has anyone measured the CCs and other dimensions on these? Possibly have a picture of the intake ports with the box cut off?

 

[AsTroSS]

I also start my porting job, but I found out Brazil and USA head have differend intake swirl design

Brazil head have very sharp edge :

And USA have round edge

Here is visual difference between exhaust port and gasket

 

[bsmith]

Which one is better design?

That's a good bit of material to remove on the exhaust side.

 

[lenahan05]

Which one is better design?

That's a good bit of material to remove on the exhaust side.

Brazil Cast will be more driveable. They swirl much harder than the IH cast with the right portwork. They do flow a few cfm short of the IH cast heads but not enough to make a noticeable difference. Personally, I like the Brazil cast for overall performance builds.

 

[oldestof11]

Brazil Cast will be more driveable. They swirl much harder than the IH cast with the right portwork. They do flow a few cfm short of the IH cast heads but not enough to make a noticeable difference. Personally, I like the Brazil cast for overall performance builds.

Any proof to this assumption?

 

[lenahan05]

Any proof to this assumption?

I dunno, What do you think?

 

[oldestof11]

I think there are certain things assumed way too much with not enough proof to back it up

 

[Jim Fulmer]

Piers had this on his site 10 years ago, the head sucks and I love 12V's but it is designed to cool not flow. Imagine the power if you had a head that would flow 400 cfm like B/B chevy!

Jim