speaking of 2 stroke diesels

also, was the gm 6.2 diesel made by detroit and was that a 2 stroke

1) To my knowledge GMC has never produced an engine. General Motors Coach designed and produced various trucks, buses, milatary vehicles, but never has built engines. A lot of the big block truck engines were built in the Tonowanda, NY plant. I don't think they made diesels. Anything diesel GM was pretty much Detroit diesel. But I will ask my dad about the GMC engine thing. I could be wrong.

2)The 6.2 liter diesel was built in Detroit Deisel's Moraine Engine plant, Moraine, Ohio. I was there in the mid 80's. The 6.5 was also produced there. I don't know if the place is still open or not.

3) I believe EMD is still in business. Production of locomotives was moved to Canada. Lower labor costs, no health care bills for GM. Engineering is still here. for now...

4) A V12 engine would certaintly been hand assembled. The production volume isn't high enough to tool up a line for it.

5) GM has made a lot of unusual stuff over the years. I was in a GM foundry once and saw a crankshaft being cast for a marine diesel. It was 20 feet long. They had been going thru dry runs on this pour for days. When you do something like that, mistakes can be expensive or fatal.

6) Even some the most common diesel engines that Deroit Diesel made, were to some degree hand assembled. A line like the 60 seies might make a 100 a day. Probably less. On a 3 shift schedule. A plant like Tonawonda makes 5,000 + engines per day.
The 6.2 was probably thier highest volume product. ( built in an old Fridgedare plant in Moraine )

I started driving truck for a living in 1960, and retired three years ago. When I started, there were a lot more gas trucks on the road than diesels. I remember talking to a "Old Timer" in 1960. I asked him how he liked the Detroit Diesel engine (4-71) in his new truck. He said "It's like a 16 year old school girl, they make a lot of noise around town, but get'em out in the country and they won't do anything".

Haven't times changed, in more ways than one.

The 6.2 was designed by Detroit Diesel and at that time Detroit Diesel was a division of General Motors. And also at that time - many people that I knew - when using the name "Detroit Diesel" were only referring to the Jimmy two-stroke-cycle diesels. So, it sometimes got confusing and often created arguments. I told a guy once that my Chevy Blazer has a Detroit Diesel in it - which it does (6.2) and he insisted I didn't know what I was talking about. Anyway - as others have already mentioned - the 6.2/6.5 engine series are all four-stroke-cycle engines. The new blocks now are made by International Engine Company - a division of Navistar and formerly International Harvester. In regard to the two-stroke-cycle Detroits - and their demise? I was told the following by a Detroit shop owner - true or not - I have no idea. He says they were first banned in California due to oil seepage/leakage - not emissions. He claims that slight oil seepage is part of their design. True? I have no idea - I know all of my 3-71s and 3-53s have always left oil-spots. In regard to power - versus similar sized engines - I don't think they had much more. Take the 440 Johne Deere. With a gas engine - 113 cubic inches it put out 31 horsepower at 2000 RPM. A 440 with a supercharged 2-stroke-cycle Detroit Diesel with 106 cubic inches put out 32.5 horsepower at 1800 RPM. A similar sized diesel in four-stroke - (not very common that small) - a Deere 1050 (Yanmar) with a 105 cubic inch engine with 33 horsepower at 2400 RPM. I don't have any torque specs - but I heard stories both ways. Many who drove road-tractor-trailers complained that the Jimmys lacked torque. Many of our Deere customers though, that used Deere crawlers with Detroits claimed they had a more low-end torque than the gas engines.

Detroit Diesel,atleast in the 149 series,and I think smaller series,assembled V12 and V16 engines by bolting 2 V6 or V8 blocks together. They a special long alignment shaft to fit the main bores of both blocks to keep the mains in alignment while bolting the blocks together.

Its been yearsssss s since I was in the truckin business so this may all be wrong or outdated lol take it with a grain of salt.

John T

John T