Piston Weights?

[alpa]

Looking again at the pictures I must admit ABF heads are not identical. Now I wonder if VW are Coscast, I see VW stamps. A year ago I spent so much time studying posts and pictures that I probably convinced myself. My goal was to find the same kind of chambers to know how much horses they can potentially produce.

However there are striking similarities with the VW heads in details that are uncommon on car engines.
The 2v heads can't be compared with 4v ones because they can't have central spark plugs. That's an important detail about the combustion and maximum effective compression.

Sorry A.S. Motorsport I could not find any Lambo or Ferrari 4v head with the same head architecture.
TC heads are a very traditional hemi design except for separated intake ports.

There was a post on a VW forum (can't find it) where there was an excerpt from a book explaining the VW intake valve is set at the 24 degrees angle. This is about what I found on the Mase 24v heads.
I'm copying this picture of a cutaway, couldn't insert a link, sorry. Comes from :

https://clubgti.com/forums/index.ph...and-maximum-porting-dimensions-thread.193826/





Few other pictures from the web:






Now compare with Maserati v6 24v head:
On this picture the chain is missing, it'd be on the left side of the cams.










Of course for every time period there are dominant ideas. So it's not surprising to find similar concepts on many engines. For example the v6 18v cambox oiling is about the same as on the Porsche 944 head, the crank case looks similar to the Porsche 928, and many other.
But the 24v head is really special, that's my point. It goes against the main idea of hemispheric heads that are supposed to create compact almost symetrical chambers with one central spark plug and the biggest possible valves that would not be shrouded inside the head. The valve inclination should decrease the amount of turns in the ports and optimize the flow to and from the cylinders.

 

[alpa]

I'm referring the 32V which has the loose cambox.

The discussion was about the 24v heads. I mentioned the 32v heads specifically to point the difference with the 24v ones.

 

[A.S. Motorsport]

348

456

What's all very specific especially to Ferrari and Maserati is the bored intake runner port at very shallow angle to the valves (very visible on a 3.2)
And that they're bored as two round machining passes, even F136 looks like this

Also the coolant gallery on the intake port side and how there are ports, (although Ferrari's port layout is often per cylinder versus split exit on Maserati)

Detail shot on a 3200GT head I did a few months ago




Again, these engines aren't related at all, that happend as we all know 4200GT onward.
What i'm trying to illustrate is they share a common set of deign features on the port and cooling side, heavily race car derived valve angles and steep inlet ports.

 

[alpa]

What i'm trying to illustrate is they share a common set of deign features on the port and cooling side, heavily race car derived valve angles and steep inlet ports.

Yes these points are definitely important. That was the first aspect I mentioned on 8ht of December.

About the 24v heads
They are the same on all 24v 2.0 and 2.8 engines. There are slight differences between GT and not GT heads and may be the other versions, but they are all compatible.
24v heads are from Cosworth: one of the best head foundry and design company.
These heads are very good:

• They had a novel (probably inspired by F1) cooling flow: on the exit side (in the V) there is a collecting gallery with two exits to the pump, so that the flow inside the head can be balanced with external restrictors on the exit path.
• The intake seats are round-shaped like in F1 engines (not a 3-5 cut shape)
• Intake ports are straight, almost vertical, with a long separation wall between two ports

Few years ago there was an article in the Race Tech Engines magazine about a novel cooling design in a WRC (or may be Time attack) engine and they were presenting the cooling architecture of the 24v head . Which was already present in the 18v heads.