Dont get into permutations and combinations for that will skew the picture. It ofcourse depends on how the engine is made out to deliver the power etc. There is no hard and fast rule as you say. But in general for budget bikes...a big single WILL HAVE more torque than parallel. Its simple maths...most of it is because of the heavy piston. The pistons heavy because its big. Its big because its displacing 250cc. When that mass comes down or goes up it is gonna deliver low end torque unlike the torque of a parallel twin. Low end because that mass cannot be reved. Royal Enfield Bullet has a torque of some 42 Nm and that engine has its blueprints from the year 1950s.

The other living proof of this is that fact that the CBR250R has more torque that the Ninja250R. If you start searching for permutations and combinations you may also find a 100cc engine dishing out 100 Nm torque. But thats not the point. Ppl were bashing Honda_Ving for he said a single too can be good sometimes and thats why I made the post saying yes, a single will have more torque. ( as long as we are talking of budget bikes which both the CBR and the Ninja are)

Only and Only for XBHP member::

YouTube - Sound of CBR250R PGM Fi.mp4

YouTube - Test CBR250R Fi 2010

yup i was atleast with cbr 250 r... hope this clears out your doubt.

sorry guys.. will keep in mind wasn't intentional...

Skew the picture how? I presented the facts...not permutations and combinations. There is no such thing as a budget twin cylinder bike unless you can point one out to me. Now moving to your technical argument below...


Can I show you a 400cc (single cylinger) piston that is lighter than a Pulsar 220cc piston? Will that help you realize that this concept of your's is incorrect? Yes the piston is big but it doesn't automatically imply that it is heavy. Pistons are designed keeping in mind the Piston velocity and not bore size. Short stroke pistons have low velocity and therefore can be considerably lighter than long-stroke pistons which reach HIGH velocities even at low engine rpm. You cannot determine piston weight based on displacement...sorry!


Again this is wrong! Piston weight has NOTHING to do with where the engine develops torque. The stroke of the engine, in most cases, is the deciding factor. I am saying this because there are short stroke engines that can beat a long stroke engine even at low rpm ranges simply due to other factors. In budged bikes, big bore engines rarely take advantage of the possibility to deploy larger inlet and exhaust valves for fuel economy reasons. The bore size is a marketing gimmick and they use the same small valves.

A heavy piston gives you sluggish throttle response and drains low end torque into moving it's mass...inertia. It is in fact a detrimental quality to low-end torque...not an asset. It is not the weight of a bullet's piston that gives it the torque...it is the long stroke that does it. Use a light-weight piston in a bullet and see how the bottom end improves even more!


Sure - but this is not a rule...neither is it an exception. So it is incorrect to make blanket statements such as "Singles ALWAYS have better torque than twins" - it is meaningless.

You were right to defend him because the CBR does have more torque than a Ninja250R...but that is where the comparison ends. There are plenty of single cylinder motors that have lower capacity than the 250R and yet generate more torque and peak power as well. There are plenty of twins with the same / lesser capacity that produce more torque and peak power. And again there are some bikes with larger capacity that perform poorly compared to the CBR.

You are comparing two bikes - thats it...technology doesn't bend over for the sake of a CBR vs. Ninja argument.

guys,

I see a semi fledged tech-know-how muscle flexing running big time. Why dont we let the Ninja in its space.. and discuss things related to the CBR 250R.

Wish I could fast forward the time till Apr'11. ::sigh::

I give up. Let the damn bike get here.

Hope we havn't scared Honda away

PS: gsferrari: thanks for the info about throttle bore

+100 to ya pal..... very very true.....

YouTube - Kawasaki Ninja 250 vrs RX 135 drag @ Tuirial,Mizoram.mp4

welcome bike from Honda

welcome bike from Honda. found the complete spec here. thanks

not able to see the video... who won??

The RX won..

Not the Ninja 250R

So The legendary yammie defeated the newbie ninja..

I always thought that the ninja will have an edge due to its twin cylinder & bigger capacity.

well modded RX... and it's a 200 meter drag.

P.S: and now this thread has a completely new direction.