The Delta plant is home to a trio of F-M model 33 engines. Before we get to those, here is a little background on the Model 33 engine.
The Model 33 engine was the next model in line after the 32 series, and was introduced around 1930. The engine was ultimately offered in 3 bore sizes – a 12″, 14″ and 16″. The engine was FM’s first pump scavenged engine, moving up from the older crankcase scavenged 32. Like the predecessor, these were rather simple engines. No intake or exhaust valves, mechanical fuel injection (in a time when air injection was still somewhat common) and a split lubrication system using both an engine driven pressure pump and a force feed mechanical lubricator.
In the case of this post, we will be describing the 16″ bore model, which has a 20″ stroke rated at 300RPM. FM offered these engines in 4, 5, 6, 7, 8 and 10 cylinder sizes. The engine was available with a dual fuel option, meaning it could run on Diesel, or Natural Gas with Diesel acting as a pilot fuel. A second upper camshaft drives a series of gas valves at each cylinder head. The Delta plant has 3 of these engines: