Can't help on the compressor. I bought a Sanden and confirmed that they ship with oil in them.
FSM=Factory Service Manual.
Builds Cummins R2.8 Conversion build thread (1 Viewer)
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Can't help on the compressor. I bought a Sanden and confirmed that they ship with oil in them.
FSM=Factory Service Manual.
So I have not done a cummins compressor. Have done others. Hence the approach above. Sucks they do not specify. Draining is good so you can confirm that oil is even in it.
fSM= factory service manual.
fSM= factory service manual.
I'm pretty sure mine was installed without any regard to checking the oil - 6 months in it seems fine.
Ok awesome! Did you get it direct from the cummins shop website?
Ordered from Cummins and picked it up and the local Cummins shop.
Post in the diesel section as well.
Swaped a 1kzte with a R2.8 but no matter what I try with the Dakota Digital I can’t get the tachometer to move at all. Can you share any insight?
torfab
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You likely can't use the 1KZ tach, because it's looking for a pulse from the IP or the ECU. I'm not familiar with the 1KZ system so I can't answer to that in detail though. I know the 100 series cluster will get its tach directly from a 1HD-FTE computer, so it's possible that the 1KZ is the same in which case the dakota digital should work. Sorry I can't be more helpful
I have an R2.8 in my FJ60. The results have been....interesting. In my rig with a H55f it has a very narrow useful power band so you're trying to shift it and even adjust your speed to get it in the 2300-2500 rpm range all the time. I also tend to rev it to get it out of lower rpms because you get excessive vibration/lugging. It's interesting that maximal torque is billed to be under 2000 rpm. That is at a variance with my experience. Also, it decided to blow it's valve cover gasket after just one oil change and about 6000 miles, which was fun. We put a TDI tuner (made in the UK) on it and that has improved it's performance and decreased the "gear hunting". I've yet to optimize the setting for mileage, but it is billed to improve the mpg by 4-5 mpg.
I really love my 4bt in my field find abandoned 60 that's in pretty rough shape. It's got great power and gets excellent mileage. It doesn't vibrate very much with the right motor mounts, and after some pump, injector, and turbo mods I can cruise at 80 all day long on 35's. Literally my only complaint is that it is pretty loud.
But if I ever own a nice one with shiny paint and no rust or dents or crappy interior, I'll want a smooth quiet diesel under the hood.
Are the folks who already have an r2.8 still pretty happy with them after a few thousand miles?
But if I ever own a nice one with shiny paint and no rust or dents or crappy interior, I'll want a smooth quiet diesel under the hood.
Are the folks who already have an r2.8 still pretty happy with them after a few thousand miles?
I don't have much to offer on here other than the few people that I have talked to who have done this swap all seem to think it wasn't worth it.
I saw a FedEx truck recently that looked to have a 4bt in it, but it was SUPER quiet at idle. Upon further examination I saw that it was a modern common rail setup. I think it's a 3.9l ISB is what my buddy called it? I'd be somewhat interested in seeing if that engine would fit in place of my 4bt with my current motor mounts and adapters. I'm still SUA, and the setup mostly works without clearance issues.
I guess for me, it is yet to be determined. The issues I noted above definitely temper my excitement for this. On the positive side, I'm getting around 17mpg, and the tuner MAY get me closer to the 20 mpg that was promised. But even at 17 mpg my range is awesome with my 40 gallon tank. Not sure what the alternative would have been. I had a GM Vortec 5.7 which was a major fail so a Cummins was an attractive alternative to another GM.
How was the 5.7 a fail? I've had those in a few trucks and vans and they were fine, if a bit thirsty... My 4bt will smoke my 89 G20 van, literally, but the van is plenty quick for what it is and still gets about 15mpg if not loaded down too heavy. It's a pre-Vortec engine with TBI rather than carb or MPFI. It'll spin the tires, and takes off quick, but once the 4bt builds some boost it's like an octopus. Big black clowd and I'm GONE lol.
I can get between 25-30mpg with the 4bt with an NV4500, 3.70 gears, and 35x10.5x15 tires as long as I keep it under 75mph. Any faster and mileage suffers.
25-30 mpg? Man that's a dream for me.
Oh. Well the 5.7 Vortec, when it worked it had good power but <10 mpg. And it took years to get it's fuel supply adequately sorted. It was very sensitive to fuel pressure and the rail pump never kept up. In high demand situations (highway speeds in the mountains) with heat and altitude, you'd get cavitation in the fuel line and the engine would shut down. Troubleshooted the pumps, set up a Rube Goldberg switch between two different pump setup with fuel pressure gauge and switch on the dash. Finally, an in tank pump fixed the problem. Meanwhile, something else was always breaking. Several replacements of the spider injectors, cracked head, etc. I understand it is a popular platform for muscle cars and whatnot, but I had had enough with it.
Very solid reasons to ditch it then! I've never had a spider injected sbc but I have had to work on them for other folks before, with similar issues you had. I'm really surprised the fuel economy was so bad, though. I still got 12-14mpg with a tbi 454 in a suburban. But I live in TN, so I rarely see elevation over 2500 ft or so. My Cummins doesn't mind elevation until I get over 10k ft or so, and then it smokes pretty good unless I can stay in the boost. Climbing, it's happy, descending and engine braking at altitude are pretty messy...
I have to be conservative with the skinny pedal and in the right conditions, but it's definitely the normal range I see. My rig is tuned pretty moderate as well. Single turbo, stock Holset with a different wheel I think, VE pump with a modified fuel pin and 3200 rpm governor, and some marine injectors. I am not squeezing every drop from it, but it's very reliable, and fast enough.
