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GM 4.3 V6 Diesel
While the problems of the GM V8 diesel used in cars is legendary, little has been written about the V6 diesel that GM offered as an option in the '82 - ~'85 model years. Does anyone have any history on this engine? Was it a gasoline conversion to diesel, like the V8? Was it as problematic as the V8?
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There never was a gasoline version of the Olds 4.3 Diesel. I don't know about reliability, but I can't imagine that it would be any more reliable than the 350, but would have the added problems of less power and a rough idle.
I always wondered why Olds didn't try making more V-6 variants of their V-8 engines, like how Chevy and Buick did. While Buick's 231 didn't have an exact bore/stroke matchup to any Buick V-8, I think it did have the same pistons as a Buick 350, but just had a shorter stroke. And then Buick had a 3.2 variant in the late '70's and 3.0 and 3.3 in the '80's/90's. Oh, and a 4.1 version too, that ran from '81-84, I think.
It would've been kinda neat if Olds had V-6 versions of the 260, 307, 350, and 403. The corresponding V-6'es would be 195, 230, 262 (which we did have, but only as the Diesel), and 302. Although I guess a 302 might've been a bit big for a V-6!
I had forgotten about the 262-V6 diesel but do recall a diesel that appears to have been even less popular. For '79, Olds "dieselized" their 260-V8 and offered it in the Cutlass. I drove one of these 90 HP cars and considered it to be badly underpowered. Even though the 350-V8 diesel was rather popular at that time, I had the impression that very few people wanted the 260 diesel. Since even the gasoline versions of this engine didn't measure up to the "Rocket V8" reliability reputation, I suppose the small diesel must have been an even worse failure - both technically and in sales - than the 262 and 350 diesels.
Do any readers have information about the reliability of the V6, given that it was introduced after GM engineers had received feedback about the problems experienced by the owners of the V8 diesels? There doesn't seem to have been much written about the V6 diesel, but that may be because the number produced was low. It's also possible, though perhaps unlikely, that the owner experience was considerably better than that of the V8 diesel owners.
I'd forgotten they even made a 260 Diesel, although I've seen the gasoline version in a few different cars over the years. Awhile back, I test drove a used '78 or so Cutlass Supreme with the 260 V-8. I had an '82 at the time, with the 231 V-6, and wanted to see if the 260 felt any faster. It didn't. A good friend of mine used to have an '82 Cutlass Supreme sedan with the 260 V-8, and it actually felt pretty quick by comparison. I looked up the stats on it and found that it only had about 100 hp that year, although I don't know the torque. It didn't feel that much slower than the '86 Monte I was driving at the time, which had a 150 hp 305 and a 4-speed automatic. One thing I noticed though...I've never seen a 260 V-8 in anything other than an Olds product, while it seemed the other engines were often swapped across the board. Did the 260 ever find its way into other GM products?
As for the 4.3 V-6 Diesel, I haven't heard much about it either, except to avoid it. Still, it doesn't have the bad rap the 5.7 did, probably because they made a lot more of the 5.7, so there were more owners to complain! In addition to cars like the Ciera and FWD 98, I think the 4.3 V-6 diesel was used in the RWD intermediate lineup as well, in cars like the Cutlass Supreme, Bonneville, etc.
One thing I've always wondered, too...did the Olds Diesel engines ever improve in reliability over the years? I know in general they say to avoid them all, but I'd like to think that GM at least addressed some of their problems over the run of that engine!
The '78 Cutlass Supreme, with the 260 gasoline V8, that my family and I drove from Chicago to Ft. Lauderdale, was pleasant and adequately powered up to 60-65 mph, but beyond that speed acceleration was quite slow. That Cutlass was a new "drive-away-car"; that is, we got free transportation in return for delivering the car to its destination, for use in a rental fleet. Compared to the 305 (Chevy) V8 in my '78 Pontiac LeMans, the LeMans was faster, particularly at higher speeds, but the Olds 260 felt somewhat more refined (quieter and smoother), if that term is applicable to cars of that era.
What's going on here? An Olds gas 350 was usually good for 160-170 hp or so in the late '70's, although I don't know the torque rating. The 307 had 255 ft-lb, so I'd guess the 350 was around 280 or so. In contrast, the Diesel only had about 120 hp in the earlier versions, and 105 in the later. Why are they so wimpy in the torque department, though?
And if the 350's torque rating is only 200 ft-lb, it makes me wonder how sad the 260 and 262's were!
The recent adaptation of direct injection technology to many diesels, naturally aspirated and turbo, further complicates current diesel/gasoline comparisons since, in addition to a fuel economy advantage, direct injection can also offer a performance advantage over non direct injection diesels. Of course, direct injection doesn't apply to engines from the late '70s/early'80s.