It's certainly possible I picked up some incorrect info from somewhere, but I don't have time to look for the link right now. However, bore and stroke differences could account for displacement differences on the same basic block.

 

The cylinder size is different yes, but the AJ126 is externally the same dimensions as the AJ133.

The block is the same on the outside but it's cast with different internal layout.

The maximum number of parts possible is shared between the two engines. e.g. the sump is the same, the front timing cover the same, and so on.

The design is such that wherever the V6 fits, so does the V8 & vice-versa. Even the exhaust pipes with the catalysts are the same on the two engines (from the exhaust manifold back).

There is not a single shared part with Ford engines. Nothing at all.

 

I found the link that says the AJ126 (V6) is essentially the same block with 2 less cylinders than the AJ133 (V8). The AJ133 has bigger bore and longer stroke.

Jaguar AJ-V8 engine - Wikipedia, the free encyclopedia

 

Yes, 2% US/Canadian, 55% Germany, and 39% UK.

 

There's a thread here on the forum as well https://www.jaguarforums.com/forum/j...-origin-94025/

Yep essentially the same block on the outside, but internally it's cast with six bores instead of 8. That's how most of the bolt on parts can be shared between the two. Certainly helps to keep costs down!

 

I still have a Discovery 3 (LR3)

So I do have a nice pair of Tatas

 

Interesting. I thought the V6 was a more modern engine. I guess not. Still the output is very impressive for a 3.0 especially with a supercharger and not a turbo.

 

I guess I have a different view. I don't think the F-Type V6 engine is particularly distinctive for its vintage. A V6 plant is capable of a lot more.
Both Ford and Jaguar are committed to high power density blocks so I think we'll see some amazing stuff coming out of both in the next few years (the 600hp Ford GT is an example!)

 

I'm inclined to agree with you, and I think the "Gen IV" AJs are probably close to their peak potential, particularly the V6. It is producing more power per liter than the V8 in the R model (127HP per liter in the V6S vs. 110HP per liter in the V8R). That does suggest there's considerably more to be had from the V8.

Ford is moving in the direction of twin-turbos, and will get a lot more from their design. I don't know as much about what JLR is doing with the new Ingenium line.