2.9 Hmmm i wonder

[HndMeDnBroncoII]

okay so .....
Has anyone tried or researched swapping parts between the v6 s
such as 2.9 heads on the 3.0 or 4.0 or the manifolds.

any ideas

 

[Wicked_Sludge]

the 3.0 is not part of the cologn engine family...so its out (you might be able to have internal components like pistons and/or cranks machined to fit...but why?).

the 2.9 and 4.0 are related...but the difference in displacement presents a problem as the 4.0 is just a bigger engine in almost every way.

 

[HndMeDnBroncoII]

the 3.0 is not part of the cologn engine family...so its out (you might be able to have internal components like pistons and/or cranks machined to fit...but why?).

the 2.9 and 4.0 are related...but the difference in displacement presents a problem as the 4.0 is just a bigger engine in almost every way.

curiosity like say for egxample 2.9 heads on a 4.0 better compression
or would the chamber be too small or 4.0 intake on a 2.9 better air flow
or way too much air flow
you see curious always asking why or whynot
to boldly go where no has gone

 

[Wicked_Sludge]

the 4.0's bore is nearly 1/3 of an inch bigger than the 2.9. that means either bank is almost an inch longer than the 2.9. i just dont think anything is going to fit.

im going on assumption though...im sure someone has tried this themselves and knows for certain if it works or not.

 

[HndMeDnBroncoII]

the 4.0's bore is nearly 1/3 of an inch bigger than the 2.9. that means either bank is almost an inch longer than the 2.9. i just dont think anything is going to fit.

im going on assumption though...im sure someone has tried this themselves and knows for certain if it works or not.

if only we had the endless money we could make Franken Ford

 

[kunar]

i remember somebody bought a set of 2.9 valves from me one time with plans to swap them into his 4.0 heads. he told me that they were bigger than the stock 4.0 valves, but when they arrived at his house, only one side was bigger but i dont remember which. i know that the stems are the same though, they use the same keepers and valve seals.

 

[Will]

You can swap any part between them as long as you swap every part.

You can also put 460 pistons in a 2.9 if you follow the same rule.

Seriously, this isn't dare to be different thinking. This has been discussed many times. But there is no point to it unless you are racing in a class where your truck has to pass a visual and you are trying to sneak in an advantage. Swap in the whole 4.0. That's the best solution. No 2.9/4.0 hybrid will be as good as a 4.0. A lot of work for no return. Nobody will be impressed.

But I'll play along for a moment. A 2.9 with a 4.0 crank would give you a 3.4L motor. The rod and main journals are the same, and I think the bore center spacing is the same as well. You would have to find connecting rods that would make it work. Or pistons with the right compression height. The piston heads have to reach up to the proper place within the cylinder. And even if you got it to work, you are still .6L behind the 4.0 swap--and a lot of money. A 4.0 has much larger ports and longer intake manifold runners. It's tuned as a complete system. If you mix-match parts (which it isn't possible, but just saying) you ruin the tune. You construct a turd that won't run well anywhere.

The 4.0 swap is well worth it.

 

[Wicked_Sludge]

only one side was bigger but i dont remember which.

if i had to venture a guess, it was probably the intake side...

 

[HndMeDnBroncoII]

You can swap any part between them as long as you swap every part.

You can also put 460 pistons in a 2.9 if you follow the same rule.

Seriously, this isn't dare to be different thinking. This has been discussed many times. But there is no point to it unless you are racing in a class where your truck has to pass a visual and you are trying to sneak in an advantage. Swap in the whole 4.0. That's the best solution. No 2.9/4.0 hybrid will be as good as a 4.0. A lot of work for no return. Nobody will be impressed.

But I'll play along for a moment. A 2.9 with a 4.0 crank would give you a 3.4L motor. The rod and main journals are the same, and I think the bore center spacing is the same as well. You would have to find connecting rods that would make it work. Or pistons with the right compression height. The piston heads have to reach up to the proper place within the cylinder. And even if you got it to work, you are still .6L behind the 4.0 swap--and a lot of money. A 4.0 has much larger ports and longer intake manifold runners. It's tuned as a complete system. If you mix-match parts (which it isn't possible, but just saying) you ruin the tune. You construct a turd that won't run well anywhere.

The 4.0 swap is well worth it.

see now that was actually informative thank you
i know now just save the hassle and go up to the4.0
but my brain keeps sayin why how come why not
i just gotta ask the weird questions

 

[rickcdewitt]

boldly go where no has gone

i just gotta ask the weird questions

its o.k. its a 2.9l thing