Some one posted this in the 2.8 stroker topic. I would like to get some more information on this swap. Is it for the 2.9 block or the 2.8? Does the 4.0 crank really fit? Do you have to source a specific year for the crank? I am very interested in this. Add a hot cam and it could make my B2 a screamer. thanks alot for any help

A 4.0L crank plus 2.9 rods plus Mopar 3.3L V6 pistons gives almost exactly the same total compression height as a stock 2.9 setip and yields approx. 211ci/3.5L.

 

Sounds like an interesting combination, but do the two motors share the same wrist pin diameter?

Also, I think Ford widened the oil pan flange when they made the 4.0L block. You may have problems stuffing the 4.0L crank in the 2.9L block.

I'd just find an Explorer at the junkyard and swap in the 4.0L. After rebuilding it of course. There are performance options for that motor. Comp has a couple cams for it. '95 or '96 heads with earlier '90 to '94 pistons will up the compression. At that point, you'd be well on your way.

 

Morana has a 4.5 stroker kit for the 4.0 ohv engine, now that would be a stroker worth investing in. You won't go wrong with the 4.0, sroked, or not.

 

The Mopar 3.3L has .9008" wrist pins and the 2.9L Ford has .945" pins. Going by pictures, K-B/Silvolite pistons for the 3.3" have enough meat in the pin boss to use a precision reamer to open them. Don't try it with a drill bit, even with a press. The increase in crank stroke is made up for by the 3.3's shorter piston compression height. Check the skirts to be sure they clear the crank though. I know nothing about block flange differences, I'm just going by the rod/piston height, piston crown, pin bores and rod journal diameters.

 

Just for grins.....

2.8L engine.......3.661" x 2.70"
2.9L engine.......3.661" x 2.80"
3.0L engine.......3.50" x 3.17"
4.0L engine.......3.95" x 3.32"

cranks have 2.125" rod journals and 2.243" mains, ex. 3.0L that has 2.519" mains

Silvolite/KB piston comp. ht. pin bore
3.3L Mopar (3.661") 1.26" .9008"
3.3L Mopar (3.661") 1.173" .9009"
2.8L Ford (3.661") 1.535" .945"
2.9L Ford (3.661") 1.527" .945"
4.0L Ford (3.95") 1.45" .945"
318 Mopar stroker (3.91") 1.465" .984"

 

Read up a little.

Someone else was talking about 2.9s cracking heads. Mine leaked from the valve covers, but was otherwise well mannered although somewhat weak.

http://ford40.com/

These guys are in the UK and are the only site I could find that talks about making a 2.9 bigger. I think they are dealing with Scorpio cars, European Fords with the 2.9. You can read through it and see if any secrets are revealed.

Sounds to me like swapping to the 4.0 is the easier path.

 

Just remember even with the stroked engine to 4.0L and a hot cam, you'll be running virtually the same power outputs as a 4.0L with a "hot cam". No big gains there really...

A 4.0L SOHC will spank it either way.

 

Revisiting this thread... does anyone have accurate info on all the connecting rod lengths? I had considered using Ford small block 5.090" rods and 'appropriate pistons' with a .9122 wrist pin bore or modifying pistons for that size bore. The only info I have found is the rod length for 2.8 connecting rods. Most other rods (GM, Mopar, Import, etc.) don't seem to be anywhere near short enough, and the ones that would be have too small of a rod bearing bore and probably don't have enough material to work with as far as overboring the rod to fit the crank(s).

 

Seriously???? cause when I calculated end displacment with the 3.95" Bore x 4.500" Stroke x 6 Cylinders you end up with a 331Cid V6 Thats a HUGE V6!!!!! seems to me with increased compression ratio,a good cam,headers, and higher flow injectors a 331Cid V6 would F'in Fly man!!!! I'd think the 331Cid V6 would put out some serious HP more than the 205HP of a stock 4.0L SOHC or were you saying a 4.0L SOHC with a set of aftermarket cams would be equivelant to a 4.0L with a Hot cam,4.5" Crank,higher compression,headers,and higher flow injectors??? ..........I'm not trying to argue or start a fight or anything like that just curiousity speaking

 

I think he forgot to add ".... until the timing belt broke" at the end, personally I've seen some of the oddest match-ups and have been surprised at the end results. HP and torque numbers don't make an engine or vehicle. They're just there for bragging rights if the driver knows what the heck he's doing

 

There are no timing belts in the 4.0 sohc. It uses chains. If you are rebuilding one, you would fix the tensioners and be good to go.

 

Irregardless of the fact it has triple chains Vs. Belts I still say a 5.4L Tweaked V6 with a Good Cam,Headers,Dual Exhaust,Higher Compression,and Higher Flow Injectors,and preferably a higher CFM Throttle Body would kick the S@#% out of the 4.0L SOHC

 

Hold on. Go back and read the previous posts.

First, in post number 7, which is 2 1/2 years old, the poster is saying a 2.9 with the 4.0 crank will only be a 4.0 with 2.9 heads etc, and would be spanked by the sohc 4.0.

In post number 9, you quote him, and refer to a "4.500 stroke...". I assume you got "4.5" from post number 3, where this comment was made:
"Morana has a 4.5 stroker kit for the 4.0 ohv engine..."

Well, it's actually, as best as I can figure, 4.3. Not 4.3 inches stroke, but 4.3 liters displacement.

Tom Morana Racing Engines

You can't fit a 4.5 inch stroker in a 4.0 block, let alone the 2.9.

So yes, if you put all those things on an OHV 4.0, it would be interesting to see how it would run against the SOHC version. Similar mods to the SOHC would result in it outpowering the OHV.

But there are no 331 CID V6's to be had out of this engine series.

Now, can we put this thread back in storage?

 

Personally, I was being a tad facetious with my comment, I know the SOHC 4.0 Ford is a chain-driven valvetrain. But, I will make this point: I personally don't care what the displacement is or what the numbers are. I've seen and personally raced many a vehicle and driver combo that should have outmatched me, but yet I still came out on top

My first interest in this thread was looking for information on a DIY bore and stroke of the 2.8/2.9/4.0, anyhow.

 

Well, Morana seems to be a good source, perhaps you can find something there, but not a 4.5" stroker.... (not that YOU were looking for one...)

The $2500 kit for the 4.0 OHV has crank, rods, pistons, rings, bearings.

I didn't look for anything for the 2.9, I think there are issues with that engine and heads that just make the swap to a 4.0 an easier way to more power.

Good luck with it.