Cummins Diesels from the '40s

[Vaughn MacKenzie]

Here's a couple engines that were used to power diesel-electric locomotives. Notice they are 24-valves Some other interesting notes are they only use 150psi injection pressure, have exhaust valve inserts, forged connecting rods, and of course 7 main bearings. Sounds like Cummins has known how to build diesels for a long time



The engine on the left is 346 cubic inches PER cylinder, the other 112 cid per cylinder.



http://www.sdrm.org/roster/diesel/cummins/

 

[supersonic]

"4 valves per casting unit" but each casting unit (head) covers two cylinders, so its still a 12 valve right?

 

[tgbol]

It is writen kind of strangely. They were 4 valves per cylinder "There are 4 valves per casting unit, two inlet and two exhaust, with an injector between each pair. The valves are of overhead type, operated by rockers which pivot on an overhead shaft. The injector nozzle plungers are operated from this same shaft by an additional rocker in line with the valve rockers, thus providing 3 rocker levers for each engine cylinder. "

They also used the same basic PT pump system were the metering is done in the pump and timing by the injector via the cam shaft.

 

[Deezul1]

Great pics of the old timers, here are some other you might enjoy. 40s International I think, its supercharged and is driven cross country towing a large trailer with another big truck on it to antique truck shows.

 

[Vaughn MacKenzie]

NICE Deezul1! '40s Internationals have a soft spot with me because my grandpa had a '48 KB-6 and I remember riding around in it when I was a kid. He hauled his John Deere crawler on it. As a teen I loved firing it up using the crank handle. Yes it was set up with one of those incase the batteries were weak (6 volt system). As I recall it had a whopping 83 horsepower.



I have thought many times it would be cool to track that truck down and restore it and drop a Cummins in it. But somehow I think the ol' hand-crank starter won't be of much use then



Vaughn

 

[Tcolesanti]

A wet sump, CAST IRON oil pan!!!!!! I think I need one of those!!!!

 

[KBennett]

These are from the Truck fest at Bandimere this year. It's not from the 40's but it is Cummins powered. I think he ran a 20. x ET in the 1/4 mile.



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[Blakers]

Some other interesting notes are they only use 150psi injection pressure,

This is the line pressure to the injectors, not the injection pressure. These Cummins have injectors like Detroits where the injector is a pump unit in itself. It meters and pumps the fuel under high pressure through a nozzel into the cylinder. It is operated by a cam lobe. I think Cummins still uses this system on some of their large diesels. Not sure though.



Blake

 

[NIsaacs]

Those are great pictures of the Corn Binder and the KW. When I was a kid we had a "43" K7 with a Blue diamond, 269 cid engine. It was the only truck that would pull it's self out of the local gravel pit. The Fords and Chevys had to be pushed. The we bought a newer one, a "44", same power.



The KW looks like a late model 40's with a 743 cid Cummins. The original output was probably 220 hp. In later years as the turbos came out, they could be pumped up to 262-335 hp. They did not have oil cooled pistons so the high hp ones were only good for short, high power output. Did you notice the new Bombs, the turbo and fuel pump? Also the fan belts and air intake missing, for "mo' power" Also note the lever on the left side of the block in front, with the chain hooked to it. That is for the compression release on start up. You could spin them over until you had oil preasure, then let'er rip. Also note the green colored casting above the rocker boxes and below the valve covers, those are Jake Brakes. I think they were invented in the 60's and the old water cooled trailer brakes were no more. Brings back memorys, of alot of hard work, but fun





"IF IT AIN'T CUMMINS POWERED, IT AIN'T A TRUCK"





"NICK"

 

[KBennett]

NIsaacs,

I don't know much about the big trucks but I thought this one was cool so I took some picures. The people that own it were really nice and popped the hood for me. The guy that I talked to knew all about it and quoted so many facts and figures I forgot some of the details but you are correct on the compression release, turbo, and pump.

I have video of it running the 1/4 mile. One of these days I am going to get it digitized and I will post it.