Banyaknya yang mempersoal tapau-menapau sesama motor. Jadi aku akan explain dari segi engineering (ambik elektif dulu automotif engineering):
1) Torque determines the acceleration.
2) Horsepower determines the top speed.

Dua-dua mempunyai hubungan:


Ini basic untuk torque dan horsepower. Lepas tu:
1) The lighter the vehicle, the faster it accelerates. The heavier the vehicle, the slower it accelerates if both of the vehicle have the same torque.
2) Vehicle with higher air drag will have lower top speed, vice versa for both vehicle with the same horsepower.


FD is the drag force, which is by definition the force component in the direction of the flow velocity,[1]
rho is the mass density of the fluid, [2]
v is the velocity of the object relative to the fluid,
A is the reference area, and
CD is the drag coefficient – a dimensionless coefficient related to the object's geometry and taking into account both skin friction and form drag.
http://en.wikipedia.org/wiki/Drag_equation

Untuk hubungkan drag force sama horsepower (untuk overcome the drag force at high speed):
P = F.V
P: Power
F = Drag force
V = vehicle speed

Dari formula drag force boleh lihat drag force increases exponentionally dengan peningkatan vehicle speed, sebagai contoh:
Katakan drag force untuk 50 km/h = A
drag force untuk 100 km/h = 4A
drag force untuk 150 km/h = 9A
drag force untuk 200 km/h = 16A

Macam mana dapat 16A untuk 200 km/h? Bahagikan 200 kuasa dua sdengan 50 kuasa dua = 40000/2500 = 16

Sebagai contoh horsepower kereta dengan top speed yang boleh didapati:
100 km/h = 20hp
190 km/h = 110hp (god car, waja, honda siti nurhaliza)
260km/h = 280hp (subaru imprekzaaa, lancer evo ori, lancer evo tiruan wiralution)
410km/h = 1000hp (veyron)

Boleh nampak semakin tinggi top speed, gila vavi horsepower diperlukan.


Jadi kapcai dengan 9hp mahu tapau KTM 390 dengan 44hp, jangan harap lah! lol
kapcai yang sudah gila babi modify pon boleh cecah 160km/h jek.
Satu-satunya kapcai yang boleh lawan ialah kapcai 125z cub prix, ini gila vavi laju.

This post has been edited by terradrive: Sep 17 2014, 06:18 PM

41k for inline 4 650cc

Not bad yo

Is this the cheapest inline 4?

Benelli TNT 600 inline-4 bike

BENELLI TNT 600 - RM30k++
YAMAHA XJ6 - 39k++

buy yamaha xj6 better buy CB650 lor....
seriousy considering rc390 or cb650......not sure my back can handle rc390 after long rides.....

This post has been edited by itanium: Sep 17 2014, 07:54 PM

CB500R is such a boring looking bike though.

no thanks, i'll wait r25

jepang bike ftw

beli la cb650f bro.. pastu buat rebiew

Inb4 after sales service for KTM is really sucks.

Scouting for valueable inline four
Bored with my duke 200 d

any reason bored? i'm gonna go for a test ride once the rc390 arrives in KK.

I tested the XJ6 liao.

sabar ba......must find a good excuse to add 2 wheels to the garage ma...

acterly this is already wrong concept.

power is produced by torque on a rotatating shaft. so power = torque (x a constant) when the shaft is rotating

there is no such thing as max torque = max acceleration, which occurs on a fix ratio gearbox.

more so when you throw in a CVT into the concept then max acceleration occurs at max power, not at max torque.

korang lupa yang rc390 punya berat cuma 140kg sementara cbr500 200kg

power to weight ratio memang rc390 champion la kot

power abang nie..

kalau nak speed 299 HP moto kena ada berapa ?

;E.......itu ktm punya 390 engine high strung ar?........

Boleh bro

wah.. that one depends on your frontal drag cooefficient also.. so if wider/gemuk than the front faring cover maybe need more HP..

Torque is the rotating force along a shaft, it is translated back into translational force by the wheels.

This is why a Silvia S15 has faster 0-100km/h time than a Honda S2000, both have about the same weight and horsepower. But the force exerted by the wheels of the Silvia is larger than the S2000 (because of higher torque), thus it accelerates faster. Remember F=m.a, so a = F/m

Check back the equations I posted, it explains the role of horsepower & torque in overcoming the mass of the vehicle in acceleration combined with the effects of aerodynamic drag.