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Now, consider
Indica V2 TC 67 hp-13 kgm- 1405cc for 1T
victa NA 68 hp- 12 kgm-1948cc-for 1.7T
Since V2 TC and victa NA has the same power/torque range, (although different cc's) can a V2 TC engine work on the victa?
How can the sumo victa NA move from standstill with an engine having less than V2TC's hp/kgm rating?
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By using calculated gear ratios, the required torque can be sent to the wheel.
If a car produces 13kgm (at the crank) has a 1st gear ratio of 3:1 and final drive ratio of 4:1, the total amount of torque reaching the wheels would be 13 x 3 x 4 = 156kgm (at the wheels).
And if another car produces 20kgm (at the crank) has a 1st gear ratio of 2.6:1 and final drive ratio of 3:1, the total amount of torque reaching the wheels would be 20 x 2.6 x 3 = 156kgm.
So whether your car produces 13kgm or 20kgm at the crank, they can be made to produce similar torque figures at the wheels.
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spacio DI NA 60 hp- 16.2kgm- 1956cc
A whopping 3L consumed, but why doesn't the spacio DI engine develop more hp/kgm?
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Unlike other diesels mentioned in your post, the Spacio is Naturally Aspirated which means that the amount air taken into the cylinder is way lower than what a TC'd engine of the same capacity would have been capable of, resulting relatively lower cylinder compression pressure.
When fuel is ignited at higher compression pressure, the force pushing the piston down is greater. This force multiplied by the stroke length gives you the torque produced at the crank.
Higher force doesn't always mean higher torque, by using a longer stroke length, an engine with a lower compression pressure can achieve higher torque figs (but at lower rpms).
However, there are many other factors like cylinder head, piston head, intake/exhaust etc that can affect the way an engine produces it's torque.
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Indica V2 TC 67 hp-13 kgm-1405cc
indigo TDI 62 hp-12.7 kgm-1405cc
I suppose power and torque are inversely proportional for a given cc, but how does this is not true in indigo TDI when compared to V2 TC?
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Well if both engine are identical in their design, it could be the Turbo Boost Pressure that might be varying or the intake/exhaust system. Unless we know all the parameters it's not possible to pinpoint the cause for this diff.
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tavera 80hp-19kgm-2499cc
bolero 63.5hp-19.9kgm-2523cc
both are UV's with DI engines, and both turbo charged, how could bolero's hp be so low? (both Kerb weight 1.6T)
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What we have to see here is the rpm at which the 2 torques are being produced. The Bolero might have sacrificed engine revvs in order to achieve that torque at low rpms. If 2 engine produce similar torque, one at low rpm and the other at a higher rpm, the engine producing torque at higher rpm will obviously have a better bhp fig.
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Also,
toyota innova 102hp- 20.4 kgm-2494cc-1.5T
tucson CRDi 112hp- 25 kgm-1991cc-1.6T
Nissan X-trail 136hp- 32 kgm-2184cc-1.6T
So what is the additional 500cc actually doing in toyota?
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The innova diesel is a bit disappointing wrt to the amount of torque it produces. They prob did this to make the bigger engine a bit more fuel efficient.
But like i mentioned earlier, the transmission plays a major role in deciding how much torque reaches the wheel. So, don't always go by what the engine specs say.
Shan2nu