Rather than Hijack a thread on Chieftain turret problems, can we continue the L60 saga here? As I understood it, there was a problem in the 50s in finding a source for MBT engines. Previously, MBTs used modified aircraft engines such as the Merlin/Comet which powered the Cent, but by the mid 50s aircraft were moving to jet power and the source of large piston engines was drying up. From what I understand, the L60 was based on a German design - a diesel aircraft engine for bombers built by Jumo which featured the opposed pistons. The advantage was said to be the ability to vary the compression ratio by changing the timing of the two crankshafts and hence provide a multi-fuel capability. The Yanks and the Swedes of course went the gas turbine path... By the 70s when the next generation of MBT were being designed, the big truck industry, headed by MAN and Volvo were starting to build big engines again so the current generation of MBT were back to conventional designs. Can anyone confirm/deny ?