Any reason why there are no small 6/8 cylinder engines?

You could get 2.0-litre V8s in some Ferraris and - yes - an Italian market TVR with a 2.0-litre supercharged Rover V8.

Lots of very small displacement multi-cylinder race engines too - BRM's 1.5-litre V16 for example. (edit: snap!)

Just cost/complexity/size/packaging/performance rules them out for most applications.
 
Extra cost with V engines, 2 separate cylinder banks, double the amount of cam shafts, takes more room in the engine bay etc etc.

They can have some very nice traits but with more moving parts it'll always equal more drag hence lower efficiency versus a standard inline 4. One of the reasons the VW VR6 was good was that it wasn't a true V6 as it shared 1 block with the pistons at about 15 degrees rather than a standard V6's 60 or 90 degrees requiring 2 seperate banks of cylinders. Also a V6 is inherently unbalanced, not than an inline 4 is perfectly balanced either..

I'm mostly referring to mainstream car engines not race/specialist engines
 
OK, lots of examples :p

I vote they become more common, pish posh to added cost/complexity/reduced mpgzz. And why haven't I heard about this Suzuki C2?
 
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