What are the differences between the different types of Rover V8 engine?
Basics first – Engine size is stroke * pi * bore rad^2 Size Bore Stroke Size 3.5 88.9 71.1 3530 4.4 88.9 88.9 4414 3.9 94.04 71.1 3950 4.2 94.04 77 4278 4.0 94.04 71.1 3950 4.6 94.04 82 4556 The 4.4 is an Australian type with a long stroke and taller block – it’s rare in the UK so maybe best ignored. The 4.2 is a hybrid engine with a foot in two camps. We then have two families of engine, 3.5 / 3.9 and the 4.0 / 4.6 The 3.9 is a 3.5 engine with a wider cylinder bore providing the extra capacity. The pistons etc are wider, but the crankshaft has the same stroke, heads, valves, covers and ancillaries are all the same except for the fact that later models of engine tend to be stiffer or improved, but you can use any parts from either engine on the other except for the pistons and the block itself as these define what type it is. The 4.0 engine has the same cylinder dimensions as the 3.9 and you can use the same pistons, heads, etc. The 4.6 engine is the same as the 4.0 except that it has
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