Cummins 2.8

[wngrog]

I spent $7000 putting a brand new 2F with AFI fuel injection with clutch and all into my FJ60.

That’s a lot of cash but it made the 60 a completely different vehicle. Smooth. Reliable and capable of 70 mph cruise loaded down.

That said I also own a 100 series Use for long trips. If I had to consolidate and make one truck the absolute best for what I do I would pick a 5.3 with H55 or NV4500.

90% of normally used Vortec motors under 100,000 miles don’t need a
Rebuild. The fueling system is so efficient that the internals don’t wear like old motors.

Even figuring $1000 for the donor motor I ended up with a projected budget well over $12,000 for the 5.3 swap so I went wit the fuel injected 2F route

 

[J Mack]

A 5000# brick with a 4:10 axle gear and 1:1 transmission top gearing is not going to get 30 mpg at legal safe highway speeds. (75mph in MI)

Agree 100%, weight and aerodynamics disadvantages are going to be very difficult to overcome, add the speed limit of (75mph in MI) or (80mph in ID) and it appears mid 20’s MPG might be realistic with off the shelf readily available parts but like you mentioned before the cost starts crossing the point of diminishing returns pretty quick.

On my setup with a 4BT, NV4500, Marks T-case gears 2.81:1 Low Range & 0.92:1 High Range (8% High Range Over Drive), 4:10 gears and 35” tires I’m running about 2200 RPM at highway speed here in ID (80MPH). Cummins wants the 2.8 to stay in the 1500/2000 RPM for efficiency so that would translate to 55/75 MPH with my current gearing. To keep the Cummins 2.8 in its efficiency RPM range at 75/80 MPH you would need a NV 4500 .75 overdrive or similar, Marks .92 overdrive T-case gear, 3:73 axle gear and 35” tires. Not only would this be expensive but I’m not sure the 2.8 has enough torque with that gearing to push a 5000# pig 80 MPH making the LS swap look all the more desirable if one just wants to build a reliable efficient pig and not break the bank.

Fun to sit around the computer and chat about it, though it’s plausible I wouldn’t spend my cash to prove or disprove.

 

[mtntoys]

Not sure if someone makes an Aisin AX15 transmission to Toyota split case adaptor but that would be a good inexpensive option and just use the AA 712593-A kit.

This can probably be done with factory Toyota parts. Some HZJ7* have R series transmissions and split cases. The AX15 and Toyota R series is the same family from Aisin.

R series - AX15

 

[Gumby]

There's a lot of info on Aisin/W/R transmission exchanging over on Pirate. I was looking at an ecotec in a 4runner specifically. Many times bellhousing might exchange, but input shafts are different and similar "it kinda could be made to fit" things.
Coming from the LC side where there are two manual transmissions and 3 transfer cases over 40 years, the mini truck trans/case options can be a little overwhelming

 

[roscoFJ73]

Just running some fuel consumption figures for the 2.8 fotun engine in the Tunland imported into Australia. Those doing a review say their Tunland consumed 9.2 litres per 100klms, thats 25.8 mpg US galls. Thats in a 1950kg Tunland. The 60 series is around 2300kg and is probably less efficient aero dynamically just looking at it. I would be surprised if you get better than 22-23 mpg in a full size landcruiser 60 55 80 series etc.