Detroit diesel engines had a lot of not-so-nice nicknames or monikers such as "Screaming Jimmy" (for GM diesel power), Green Leakers (Detroit engines left the factory painted green, and could be counted upon to leak oil all over themselves and anything in close proximity), or "Smoker" amongst other names. We had a cat that was a member of the family, and while his name was "Meerkat", I used to call him "Detroit". When Meerkat was content or laying on my chest in the evenings, his purr had a sound and rhythm like a 6-71 at idle. I used to call him "Detroit" more often than not. Once you've heard a few of the old Detroits, you know the sound. The Detroit diesels were two stroke engines with Uniflow scavenging. A Roots type blower was used to blow the scavenge air. The governors on the Detroits were usually set up with an intentional "hunt" in them at idle. This was to kick up the rpm every few seconds to keep oil going to the Roots blowers. The throb of a Detroit at idle is one thing, but under load, it is quite a unique sound.
Call me nuts or worse. I was once asked to witness a load test on a new diesel genset, since the owners wanted a Professional Engineer to sign off. The genset engine was a GM Electromotive (or "EMD") 16-645, turbocharged. GM knew a good thing, and stuck with it- a two stroke diesel engine with unit injectors. This basic design was applied over GM's entire range of diesel engines, from the smallest (53 cubic inches per cylinder) to the EMD locomotive class engines.
Anyhow, the load test on this new genset was at the genset assembly/dealer's plant. The plant sat in the middle of a residential neighborhood that had grown around it, and one end of the plant property backed against the mainline passenger track between Washington,DC and Philadelphia, PA. That track was up on a high fill (embankment). The dealer was like a used car salesman, so had scheduled the load test for 6 AM on a summer Saturday morning, knowing the air would be cooler and the engine would make load and then some with the cooler air. In addition, they did not mount the mufflers- telling the owners of the genset that it would take structural steel to carry the mufflers, did they really want the paint burned off the mufflers, etc. Truth was, they knew with no mufflers, that engine would make more than rated load.
The test began with the genset wired thru a transformer bank (it generated 2300 volt current) to step down to 480 volts, and then into a forest of load banks- cast iron grid resistors with powerful cooling fans. We got the engine started and idling, and after a few minutes, started picking up load. I had earplugs in, and was wearing ************ type hearing protection on top of that. I had my pad to write readings, and was running around taking readings and checking and feeling different parts of the engine and generator. Pretty soon, we were at full load. The ground under my feet seemed to be shaking, and the air was vibrating from the roar of that unmuffled engine barking at full load. We went to 10% overload. All readings looked good, and I felt that engine through the soles of my boots and in the air around me, no other way to describe it. I was LOVING it !!!! The hair on my arms stood on end, it was a real rush for me.
About that time, a local cop car pulled into the plant's yard. One of the plant owners, a real arrogant rich man's son with a nasty temper, ran over to the copmobile and shoved his head in their faces. The cop car left the yard and we kept running balls to the wall. All of a sudden, there was a bang like a 10 gauge shotgun or louder and I heard the engine winding up fast. I dived onto the ground on my stomach, not knowing what let go, but figuring if the engine ran away, there'd be engine parts shooting every which way. Before I hit the ground, it got deathly quiet with the only sounds being the fans on the load banks and a diesel fuel forwarding pump. As I lay on the ground wondering what the hell had let go, I found myself wet with diesel fuel- an overflow of the day tank. Turns out the radiator fan shaft had snapped. Improperly designed, it was about 2 1/2" diameter or a bit larger, and some numbnuts had it made out of cold rolled steel with a continuous keyway over its length, and a reduction in diameter with a sharp-corner at the shoulder. The fan had eight blades and absorbed about 120 HP. The genset dealer left it up to a vee belt salesman and the cooling fan salesman to design the fan and drive based on what the radiator salesman proposed, and the radiator salesman took his cue from GM EMD information about pipe sizes, gpm coolant flow and how much heat the engine would reject at rated overload.
In short, there never was any real engineering on that fan shaft. I got asked to redesign the fan shaft once we figured out where we were. We had a repeat of the load test with the new fan shaft, and made load and rated overload, running 2 full hours. No computers in those days, so it meant writing readings on a clipboard. Once again, the hair stood up on my arms when that 16-645 snorted and barked. Call me nuts, but the sound of a big engine pulling full load will do it for me.
I've been around gensets with 8-268A Clevelands (an early "Winton" division of GM/EMD engine built for WWII), and some 12 and 16- 278's (also the old Cleveland division of GM, before it all went to EMD). Great old engines, for sure.
We have a LOT of GM Detroit diesels on our maintenance of way equipment on our shortline railroad. We know how to work on Detroits, and we have the tools and even an injection test stand. Seems like the old Detroits were all over the place for many years. Also seems like you can't kill them.