Im not really in tune with fords v6s. I know their v8s inside and out, but the idea of a 4.0L has been kicking around the back of my mind for quite some time. Id like to know things like rod length, rod jounral diam, main bearing diam, if you can bore em to 4", if a carb'd 2.8L intake will work on the 4.0L, port size, head cc, what parts you can use out of other engines, deck height, piston comp height, deck clearance. That type of stuff....now that you get my drift

Heres what I know:
The 4.0L
bore x stroke= 3.95x" x 3.3xx"
it has the largest bore on a v6. Which is why I want to play with one. Before I go getting any ideas Id like to know all the measurements so I dont necessarily have to go looking for 4.0L stuff.
Ive been searching this forum for the last few days and have come up with some of my answers, but most of the posts seem to be mostly maintenance repair type. So forgive me if youve posted the info Im looking for. If I can find the majority of stuff Im looking for and get it all in this thread, then you can point the next guy to this thread. If there is one already tell me to STFU and point me in its direction.

That being said, I have a very vague idea on a 4.0L buildup, too vague to post before knowing more about the 4.0L, except high compression and propane. Hope someone has the answers Im looking for.
-Al

 

I've been wondering the exact same thing! Things like deck height, head cc's for different years, rod length, crank specs, piston dish cc's for different years, valvetrain specs, cam specs, etc. My evil plan was to build a high compression E85 motor.

I guess we've got the same question here Al.

 

well you let me know what you find out, and ill let you know what I find out.
So far Ive read they have 1.46:1 rockers, about 1.45" comp height, and just under 6" rods. The crank bearings were very similar to a 302....within a couple thousandths of each other.
I cant post links, but google "Ford 4.0L" and theres an article on how to rebuild the 4.0L from the ranger station. It tells you a little bit about the differences the newer years brought....but no specific measurements. Most of the info Im finding is from aftermarket companies home websites. I got the piston info from KB, it also states they have 0.945" wrist pins...not sure if thats stock or not.
Im going back to my research.

 

Hmm, perhaps the results of all your research (when you have them) could be written into an article. These questions have come up in the past, and I too have read the article you refer to and while it's got some good info, it's by no means complete. For some reason, this info seems to be hard to come by on the 'Net...

If you've been doing your research in this forum then you should already know that the 2.8 carbed intake won't fit (I believe that was covered here last week) and that very few (if any) other 2.8/2.9 parts will work.

 

This link might help.
http://www.babcox.com/editorial/ar/ar40123.htm

 

I'm pretty sure I read .945" was stock wrist pin size.

I had a thread a little bit ago about high compression pistons. I believe these would be the ones to go with for a high compression motor, especially with 95TM heads:

http://www.kb-silvolite.com/spistons...tails&S_id=477

I think they're for a 4.0L SOHC motor. As such, you *may* need to machine valve reliefs.

Maybe I just need to pull mine and get out the micrometers?

 

I did find out that the 2.8L intake wont fit the 4.0L. Just a little late to get there.
I read the 4.0L rods were 5.9". Nothing to confirm this. Although I do remember reading somewhere before that the 4.0L rods were the damn near same size as a Windsor rod.
IF that info is true, the deck height would be around 9"....measuring with 3.3" stroke, 1.45" comp height, and 5.9" rod gets 9" on the money.
I'll keep posting what I find, and then can condense it into just the facts.

 

Okay, pud asked me to post this link:

http://www.meadowlandford.com/ford-r...gine-specs.htm

It contains some detailed specs for the '04 2.3 DOHC, the 3.0 and the 4.0 SOHC.

 

found some more good stuff here:
http://www.fordracingparts.com/download/charts/217.pdf

4.0L:
bore: 3.95"
stroke: 3.32"
bore spacing: 4.76"
Deck height: 8.858"
main journals: 2.2437"
rod journals: 2.1256"
rod length: 5.748"
comp height: 1.458"

2.9L:
bore: 3.661"
stroke: 2.835"
bore spacing: 4.76"
Deck height: 8.858"
main journals: 2.2443"
rod journals: 2.1256"
rod length: 5.140"
comp height: 1.461"


has every other engine in the link too, looks like those 2 engines are alot alike....although I think they made a typo on the 2.9L somewhere, because the math doesnt add up, it works alot better with the 2.8L deck height.

 

Well, I got a 4.0L motor to take apart and rebuild. Here's some measurements I took:

Head gasket thickness: .050"
Piston to deck clearance: About .008" above deck (out of the hole)

I'll check back as I get more info. Some of that will be combustion chamber volume.

I got a manual with torque specs. Should I post them?

 

about 4yrs ago I found a company that made a intake for the 4.0l to put a 4bbl carb on it. they were from aus.it was like 400 bucks. they said t was a one off proto type thing.and I woul still have to figure out timing.you can not put a dizzy on the 4.0l how the intake is made even though they have a port for a dizzy.

if someone figured out a better top end oiling system for the 4.0l that would be a great step. ever looked at the rocer arm fulcrums(push rod tip) of a 150,000 mile 4.0L.

 

Yes they're completely worn out! But there is a reason. It's not entirely due to lack of oil. It's because the 4.0L uses a roller cam, and the pushrods dont spin. They develop a wear pattern, and that's what you see.

 

With the pin diameter listed as well as compression height, sounds like you could
bore to 3.965 diameter and use Buick 4.1 liter V6 pistons. They are pretty close.
Notice I said 4.1 V6, not the far more common 3.8 V6. As for the intake, why not
build an adapter to bolt a two barrel on to the end of the steel intake tubes where
the throttle body bolts on. No ideas on what to do about the ignition though.
I have seen the carb adaptor thing on a 2.9, but it uses a distributor. Runs fine,
acts like a long tube ram intake similar to the early 1960's Chrysler 413's and power
pack slant sixes.

 

What are you trying to gain using the Buick pistons?

 

I just figured it might be easier to find Buick pistons for less
money than .030 over pistons for a 4.0. Unless of course you
need a .030 overbore on a wore out 4.0. I know they make
forged pistons for the Buick, don't know about the 4.0. Since I
can't find a cheap 2.8 V6, I am attempting to put a 4.1 Buick
V6 in my Pinto wagon. I got mine in great running condition
out of a 1980 Buick Electra for $50. Working out the oil
pan details right now. Then motor mounts!