I worked on the Comet engines and transmission in the mid 60s during my apprenticeship. It had 4 Detroit Diesel 6/110s in the power car, coupled to 2 transmissions. I also worked on the later railcars which had 6/71 Detroit diesels.
BTW, 2 stroke GM diesels (like these) have oil in the sump and a normal lube system, they don't draw a charge into the crankcase like petrol 2 strokes do:
There's a row of inlet ports right around each of the cylinders at BDC, these are fed air from a Rootes type blower at about 3psi. The 4 exhaust valves are in the head, and all open together.
So, it works like this- the ex valves open before BDC on the power stroke, the incoming air scavenges the exhaust gases up and out the exhaust valves, which shut just before the air ports are covered. So cylinder is now full of air. Then just before TDC (on compression stroke) the fuel is injected, ignites and the power stroke begins.
Back in the 60's a 6 litre 2 stroke diesel had the same power as a 12 litre 4 stroke one (without a turbo). It was also half the size and weight.
<edit> Later Detroit Diesels had a turbocharger as well as the blower...
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So did you do your apprenticeship at Eveleigh Doc?
Army uses lots of GM671 and a sweeter sound you will never hear- well one of the best you will hear.
I toured the Twin Disk factory in Racine, Wisconsin a few years back. Mag-bloody-nificent!!! Enormous power transfer boxes and all manner of other neat transmission thing-u-mies!! On that same trip I got to drive a 1000hp V12 powered fire appliance - funnily enough, it sounded nothing like a Mini
no surprise and does not like cats
