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EMD 645 Diesel Engine Specs


EMD 645 Arrangement, displacement, bore and stroke

v8 turbo 2-stroke engine
v12 turbo 2-stroke engine
v16 turbo 2-stroke engine
v20 turbo 2-stroke engine

v8-645 84.6 liter; 5,160 CID
v12-645 126.8 liter; 7,740 CID
v16-645 169.1 liter; 10,320 CID
v20-645 211.4 liter; 12,900 CID

9.0625 in, 230.2 mm

10.0 in, 254.0 mm

EMD 645 Power and torque

v8-645 1650 hp, 1230 kW @ 900 rpm

v12-645 2300 hp, 1715 kW @ 900 rpm

v16-645 3000 hp, 2237 kW @ 900 rpm

v20-645 3600 hp, 2685 kW @ 900 rpm

v8-645 9629 lb.ft, 13,056 Nm @ 900 rpm

v12-645 13,421 lb.ft, 18,200 Nm @ 900 rpm

v16-645 17,507 lb.ft, 23,739 Nm @ 900 rpm

v20-645 21,008 lb.ft, 28,487 Nm @ 900 rpm

EMD 645 Weight
v8-645 22,050 lb; 10,002 kg

v12-645 28,306 lb; 12,839 kg

v16-645 36,425 lb; 16,522 kg

v20-645 43,091 lb; 19,545 kg


EMD 645 Airbox pressure problem

  EMD 20 cylinder engines
EMD 20 cylinder engines arranged in a row, Click for EMD 645 manuals and specs

Unexpected technical problem causes big headache!


Why? The air box pressure was too low!

What happened is that these engines originally operated at 900 rpm to produce electricity at 60 cycles
They were purchased collectively as an installation, and sold to generate power in South Africa where the national grid operates at 50 cycles. This meant that the engines had to now operate at 720 rpm and not 900 rpm. The necessary electrical changes were made but on starting, the engines smoked excessively and would produce no power.

When we measured the air box pressure it was about 7 psi - no good! Far too low! We told the customer he had to upgrade his turbos but he wanted proof before spending another cent. 220 million bucks is quite enough for a white elephant, thank you!

Well now we proved it, with the help of huge hired compressors. We pumped air into those enormous air boxes and artificially increased the air box pressure to about 13 psi.

EMD 645, When the magic 13 psi happened:
Hey Presto! Even those smaller turbos kicked in and normal power was produced and the engines ran normally with no excessive smoke.

When this happened the engines' own turbos sustained the power and maintained the air box pressure at 13 psi without assistance. Now the artificial source of air could be removed with no effect to the performance of the engine or change to the air box pressure.
In fact a type of 'terminal' air box pressure had been achieved, so that if you pumped air in or not, it had no further effect on the air box pressure. That is, it neither rose when air was pumped in, nor fell when the assisted air was removed.

However, if the engine needed to be restarted, the air boxes had to be primed again and the air pressure had to rise to 13 psi, in order to get the turbos to kick in and produce power.

The net result was that the turbos were subsequently modified and the modified engines' operated fine after the modification.

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