In the early years VM marketed marine engines under their own brand namely the HR492H/9 and HT9. These were water cooled normally aspirated and turbo charged engines aimed at the smaller end of the pleasure craft market.
VM HR-492H9 Marine Engine Prior to reconditioning
Now in the later years VM also market the marine engines under their own name namely in the MD700 range and the newer MR range of engines.
In addition to the above engines, VM also manufactured air-cooled marine engines designated the M11.5
The MD700 range was updated to the MR rnage which employed a single cylinder head and conventional cylinder block construction, for the first time detraction from the modular design of individual cylinder heads.
A certain number of the spare parts throughout the VM range are interchangeable but generally speaking, a VM serial number is required to determine the engine type.
Larger engines were re-badged as VM but were actually manufactured by other companies such as MTU and Schwitzer.