Bigger bore

drummer

New Member
Sep 5, 2004
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I wonder why ford hasnt built a motor with a larger bore but the same stroke as the current 4.6? I dont know but I would rather have a bigger bore than a longer stroke.
 
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drummer said:
I wonder why ford hasnt built a motor with a larger bore but the same stroke as the current 4.6? I dont know but I would rather have a bigger bore than a longer stroke.

The bore spacing is too tight to allow it. The Cammer has a 3.7" I believe, but that's it. That is the downfall of the modulars - they were squished for use as FWD also, but were never used as originally intended but still we have to live with it. No matter, throw in forged internals and a whipple blower. The great equalizer! :D
 
drummer said:
I wonder why ford hasnt built a motor with a larger bore but the same stroke as the current 4.6? I dont know but I would rather have a bigger bore than a longer stroke.

Because to purchase and install ALL the tooling required to make a larger bore spacing engine will cost Ford hundreds of millions of dollars. Not to mention the engineering hours.

There is a larger bore V8 coming, the Huricane, but it's still 2 - 3 years away and it's not yet clear whether the Huricane is slated for the Mustang.

If you have a spare $100,000,000 dollars laying around that you want to donate to Ford, it may let them pull up the Huricane introduction.
 
351cj...

Hundreds of millions of dollars?

What are you smoking?

They have in house designers, not outsider contractors. They pay them what they pay them, they have machining equipment and they also have data.

I dont know where you get 100million from.

Maybe 3-4million tops with research/ development, testing and employee pay.

They made their money back time and time again with the 4.6, which has been around since 92.
 
One Wicked SVT said:
351cj...

Hundreds of millions of dollars?

What are you smoking?

They have in house designers, not outsider contractors. They pay them what they pay them, they have machining equipment and they also have data.

I dont know where you get 100million from.

Maybe 3-4million tops with research/ development, testing and employee pay.

They made their money back time and time again with the 4.6, which has been around since 92.

From you #s, you don't have a clue what it costs to develop a new engine and put it into production. You're only off by a factor of 50 - 100. :lol:

I used to be in the machine tool business. We sold equipment to Ford, GM & Chrysler. I know how much it costs to build a new engine plant. Most of the equipment that Ford uses to build the mod motor is fixed for its bore size and other dimentions. It cannot be adapted to make a larger bore engine, which is why the 5.4 uses the same bore spacing. So to build a new V8 in volume Ford has to buy lots of machinery and belive me its hundreds of millions of dollars worth. It can cost over a million dollars for just 1 piece of machinery.

Fords plants with newer equipment, like Lima has flex machinery but not the Mod motor plants.

Engineers are not free, if you want them working on a new V8 you have to take them off of other projects, like the Duratec 35, which is what they've been working on. Now that the Duratec 35 is nearing production, they're probably working on the Hurricane.

Ford has also lost tens of billions of dollars over the last 5 years, so they have to pick and choose where they spend their development $$. Believe it or not a larger bore V8 has not been at the top of Ford's priority list for the last few years.
 
As RandyB said, the Modular Motor simply wasn't designed in a way to allow much bigger bores.

Hopefully the "Hurricane" borrows some of GM's LSx technology.