Dear SiFus,
For cars with say 2.4 litres, they have, without mods, horsepower usually like 240 hp.
Likewise, a 3 litre engine can produce something like 300hp.
While turbo charged Vios can produce 145 hp, why is Vios 1.5 litres only producing 109hp without mods?
regards
Richard
I think I know what are you referring to. No, a car that has 2.4 L does not necessarily produces 240 hp. The power and engine capacity is not directly proportionate. The power from an engine depends on a lot of factors i.e the engine design, the tunning/mapping, the materials used.
That is why for a 2.4 L engine, some produce 150 hp, some 160, some 170 hp. That is the standard. We refer to this as "specific output" and it is expressed in power per litre. A normal modern NA engine in a passenger will normally produce around 65 - 80 hp per litre.
Race bred NA engines will have 95 - 125 hp per litre.
Forced induction engines might have 95 - 200 hp per litre.
For the camry 2.4 L you've mention, it produces lower specific output than normal 2.4 L because it runs on atkinson cycle. You can google about that. It gives better fuel economy by sacrificing a little power.
for vios, 1.5 L producing 109 hp, I would say it is healthy for a modern valve-timing engine. It means it has 72.6 hp/litre.
Turbocharged engines will almost always have higher specific output than NA engines because it increases the "effective displacement" of the engine. For example, a vios turbo might have a displacement of 1.5 L. But because of the turbo, its "effective displacement" might actually be 1.8 L (just roughly).
