Date registered: May 2005
Vehicle: '07 GL320CDI
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Quoted: 1 Post(s)
RE: V6 or V8?
Usually multicylinder engines are capable of making more horsepower than engines same displacement but fewer cylinders.
Many engineers feel 350cc is the ideal cylinder displacement, hence the rush to V-10 engines when Formula One specified a 3.5 litre engine formula.
The downside to multiple cylinders is added cost, of course, as it requires about the same $$ to make a bigger piston, bigger rod, etc. Of course there are lots more valves, springs, injectors, etc., on multicylinder engines, further increasing costs. Usually multicylinder engines require two instead of one cylinder head, as well, further increasing costs and a reason VW designed the single-cylinder-head VR-6. Inline sixes and eights create serious packaging problems, of course, and really can't be built with same/similar tooling as V- engines.
Clearly vibration is reduced with smaller, lighter parts, which is the "backdoor" reason multicylinder engines are usually smoother. Since they're also more expensive by general nature, they can additionally bear the extra cost of special efforts to make them smooth. There are no six, eight, or twelve cylinder econoboxes.