what is the difference between a EMD 567, 645,or 710. also on GE diesels what does FDL stand for/
Can’t tell you what FDL stands for (its Deutz successor was HDL, if that helps anyone). But the numbers on the EMD engines represent the cubic-inch displacement per cylinder.
567 = 8-1/2 inch bore, 10 inch stroke
645 = 9-1/16 bore, 10 stroke
710 = 9-1/16 bore, 11 stroke
If you calculate the volumes of those cylinders they should come out right.
“FDL”
Some information I found:
The engine has US Navy connection.
“F” Basic design
“M” or “L” indicates marine or locomotive use.
“DL” Possible ID for Diesel…a GE designation after they purchased the engine design.
The Engine model designation originated with Cooper-Bessemer who designed the diesel.
F = 9" cylinder Bore
D = Turbocharged
L = Locomotive use
For the first letter C-B used “G” for 10.5" and “E” for 8" cylinder bores
For the second letter C-B used “N” for Naturally aspirated and “S” for mechanically supercharged,
While I’m more than happy to agree that F represents the engine size and L is for locomotive, I doubt that D indicates turbocharging. It is possible that “D” is a sequential designation.
The GE 70 ton end cabs had a Cooper Bessemer in line six cylinder described as an FWL-6T.
Contemporary export units in 1951 had engines described as FVL-12T (T for turbocharger).
I think the export engines were known as FVBL by the mid 1950s and were used in the UD18B.
The “D” might represent a development of the “B” in the UD18B.
I am unfamiliar with any US Navy use of the FDL engine, although 567, 645 and 251 engines were used as were many Fairbanks Morse 38D-8-1/8. But these were engines with welded crankcases, and the USN was concerned about the ability to withstand shock loading, something a cast block might not perform well doing.
M636C
The GE center-cabs built for the Monongahela Connecting used Cooper Bessemer GN8 and later EN6 engines. The final two 128-ton units for the Mon Connecting used GS-6 diesels. Note that none of these models used the “L” for locomotive. My thought is that the “W” referred to a different type of Turbocharger. Was the turbo used on the FWL-6T air or water cooled?