does anyone knoe the wieght of a dressed 6.9,7.3 n/a diesel? i am building a 50s custom truck and switched to diesel mode. I have not yet decieded to use ford or chev diesel.strictly for touring no trailer 2wd.the 6.2 in my old suburban got 28 mpg canadian. i preferthe IH build ford diesel but i think it wieghs in quiet a bit heavier. also does the ford overdrive e4od? have a complicated stand alone wiring say from a 93 truck. dave.

 

A fully dressed 6.9 is at least 950 pounds according to some articles. The E4OD has a stand alone PCM from 1989-1993, after the powerstroke, it uses a single computer for the engine and transmission.

For durability, the 6.9 wins hands down, for fuel economy, the 6.2 has the edge being lighter, and can be fitted in a lighter frame (6.9s were never offered in 1/2 ton trucks).

I would suggest looking into an aftermarket controller for the E4OD. It might cost a little more, but you get more control over the transmission. I converted my 1985 truck to overdrive using the baumanator TCS, and it works very well.

For what its worth, I have seen up to 22 MPG with my 6.9 (70 MPH).

 

the dry weight of a 7.3 liter is about 900 pounds, i dont know about the others

 

thanks guys.David85 is the 22 mpg with your list 86 f250.what rpm was it turning at 70 mph. with 3.08 and o/d. iwas thinking of making stainless headers with twin mercedes turbos from 3.5 litres with suplimental propane. i have just about everything but the time. so was hoping to get engine in this years and make the induction over the summer. the 6.2 wieghts in about 675 so extra 300 lbs over the axle might or might not be good.

 

These are the conditions that I got 22MPG with:

Calm wind

Speed - 120KPH (set cruise and left alone)

RPM - 2450-2500

Box empty with tail gate up (I normally have a boxy cab height canopy)

Outside temperature was around 10C, with high humidity and even mist (the engine loves those conditions), rain does not help as it increased friction, and drag

Transmission was a C6 at the time, I did not have the turbo either, but did have a ram air intake (truck did not have the "soup bowl" when I got it)



22MPG was the highest I ever recorded with the truck, its possible that it could have done better at lower speeds, but I never use the slower highways, so I can't say for sure. Unfortunately, its very rare that I can use the truck without the canopy, or unloaded.

With the C6, my average was 15 MPG (the truck is normally used for hauling railings on the canopy, so that really kills MPGs)

Shortly after the swap to the E4OD, we began using a large trailer for hauling the rails (painters complained about bugs), MPGs have not really changed, even though I am hauling more with it now. I do not use the overdrive when towing though, the revs are too low, but with the locked TC in 3rd gear, the RPM is closer to 2200, and it is happy at those RPMs.

The best I ever got with my current setup was 17 MPG, but the canopy was on, and the cruise was set at 130KPH (80MPH), I enjoyed that drive.

With 3.08s and OD engaged, RPM at 70 MPH is 1600.

I should aslo mention that there are many long, steady hills on the highway I drive, hardly any flat road at all.

 

thanks for the info.the 6.9 starts with 40 hp extra but need to see if the extra weight will be a problem.