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Making the bike lighter and safer

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  • Making the bike lighter and safer

    Hi All,

    We all know how critical Power to Weight ratio is for bikes.... specially those which we intent to rip hard. Also, it's a fact that most of the Indian speedsters have very lousy numbers in this aspect, resulting in the bikes not being able to perform to their full potentials.

    Say for example my bike - 2007 Bajaj Pulsar 200 ->

    With a Peak Power of 18 PS and a kerb Weight of 145 Kilos, the bike is expending a considerable amount of that 18 PS pulling itself. And when I'm riding it, it's a straight 145 + 80 = 225 kilo..... but the Peak Power reamined the same at 18 PS. Again we also need to consider the fact that this Peak Power of 18 PS, comes somewhere arround the 8500 rpm mark, and genereally we are not ripping that hard all the time, so that means, I mean putting 225 kilo on the bike when it's milling out less than 18 PS.

    One way to decrease this dicrepency is to amply increase the Power Output of the Engine. But with the current SOHC, Single Cylinder and twine valve architecture of the engine, we can't make a significant impact on the engine power, and also I do not advocate heafty engine mods. So, the other way round is to make the bike lighter...... as lighter as possible. But the approach should be sensitive and well thought off, else instead of zippy bike, we would be riding a time bomb, ticking and waiting to fall apart.

    Second most important thing is the safety features. I mean take any Indian bikes and it's sans any safety features. It's a fact that the bike is as safe as the rider rides safely, but still our Indian bikes lack any safety technology built in. I Gurgaon roads, I've seen fatal accidents with rider riding a 100cc bike and crashing!!

    So, fellow Bikers .... Bike Lover let's discuss how we can make our mean machines more zippy, lighter and above all safer..... so that when the fun is on.... we live it to the fullest!!
    Twist your wrist and feel the shift!!

    My own thoughts - Throttle

  • #2
    Topic Approved.
    :)

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    • #3
      Thanks Aryan!!
      Twist your wrist and feel the shift!!

      My own thoughts - Throttle

      Comment


      • #4
        empty your balls and bladder before you ride, that might help

        on a serious note, safety features like ABS or CBS result in extra weight on the bike and not all riders like the feeling that they are not in the control of their bike. The most you can do to shred the weight of a 18 ps bike is to remove the side and front panels and use light weight alloys but that would make your bike looks alien and illegal to ride on city roads.
        www.motorcykle.in - The lighter side of motorcycling

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        • #5
          If you are seriously thinking of changing the bike light, you can take cues from Joel's Super Fiero thread. Some weight can be shed by using a lighter swingarm (must be sturdy though). You can also opt for a lighter and custom-built free flow exhaust to shed some more kilos of the P200.
          The Leh Experience!!
          My '08 Suzuki GSX650F

          Escapade to the Eastern Ghats
          Orissa 1302
          My BlackBull - Bullet Electra 5S

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          • #6
            @ pulsater
            Nice joke there bro!!

            For the ABS making the bike heavy..... I would suggest just check out the ABS unit at KRPs website.... it's just a small unit and is of negligible weight, but works like magic.... alternatively you can also check out the steering damper... and that's also pretty light.

            @diffuser
            A lighter swing arm can definitely be an option, but ya.... finding the right stuff can be a challenge.

            The intent of this thread is not that I want to do some mods on my bike and I want some help (else I would have put up the article on the Help forum ), but I was looking for some serious discussion on making our machines more agile, not only mine but every biker in this forum!!
            Twist your wrist and feel the shift!!

            My own thoughts - Throttle

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            • #7
              So, you may remove the tyre hugger, chain covers, mud guard, saree guard etc. & use lighter tyres. and your weight reduces by 5 kgs. This might make a small difference in your performance.

              But, What's the use of decreasing 5 kgs? Will it really create a noticeable difference?

              I mean, 200 kgs or 205 kgs, What would be the difference?

              We can remove a lot of stuff to save weight, but we need our bikes to be ROAD USEABLE... so, we need those things like RVMs, Half fairing+ Headlight, etc.


              A great thing we can do is use alternative exhausts. They save weight by an acceptable margin, and also perk up the low end & middle end torque.

              But again, you should learn to live with that noise (for me, it's serious music though) ...
              ---
              Brotherhood, Rules, Freedom. Xbhp.
              Indian riding = Alertness, Anticipation and Adjustment.

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              • #8
                @Samarth

                That's some really meaningfull insight you have there!!

                I too accept the fact that there's not much scope available in the stock bike to reduce the weight and still maintain the useability of the bike. Going for lighter tyres is a good choice though... for example Michilen's soft compound tyres are good, they are not only light, but they provide that extra bit of helpfull tracktion (a little at the cost of economy though!!).

                Then again you mentioned about the alternate exhaust which can also be an option but might not be that acceptable, because of the noice factor you mentioned.

                Frankly speaking I myself having ridden so much and hard, both here and in US, can't think of much, by which we can make our Indian bikes have Power:Weight ratio more close, coz the design and implementation of the bikes from ground up have not catered to this aspect.
                Twist your wrist and feel the shift!!

                My own thoughts - Throttle

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                • #9
                  Just curious, why is a P200 heavier compard to say, a Splendour. Is it only the frame that contributes to the weight or are there some other factors too?
                  Your biking tells a lot about the person you are!

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                  • #10
                    @abhijeet

                    Dude, I might be wrong but here's what I think as to why a P200 might be heavier than say a Splendor (because before my P200 I used to ride a Super Splendor and my elder brother rides a CD Dawn!! )

                    1) First and foremost as you pointed out is the chassis!! For the increased power, the chassis has to be stronger. Since not much is invested in building a steardy, yet light frame, so the chassis does take the hit of getting heavy. Also, the P200 has a longer swing arm than CD Dawn and the Super Splendor.

                    2) Second I think is the weight of the engine. A bigger engine is bound to be heavy than Horizontal 100cc or the 125cc.

                    3) The bigger rear tyre of the P200 also plays it's part. The stock MRF Zapper is definitely heavy. I just did a small test myself. I pickup the default 120 section rear tyre of the P200 you need to use atleast your three fingures. But at the same time, if you try and lift a Michilen's 130 section soft compound rear tyre, you can lift it using your pinky fingure.

                    4) Then again the bigger fuel tank and the huge exhaust mufler paly their part.

                    Unfortunately enough, all the above four points I think are the major contributers to the overall kerb weight of the machine, but except for the tyres, I think we can't do much about the others as they are very integral to the overall design and implementation of the bike.

                    Do, let me know your thougts!!
                    Twist your wrist and feel the shift!!

                    My own thoughts - Throttle

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                    • #11
                      spend a few lacs and get it carbon fibre re bodied and custom lightweight aluminum chassis
                      Chrome rims and bling ? get a real life !

                      http://www.facebook.com/GTR33

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                      • #12
                        seriously speaking

                        if you get down to reduce weight of a typical indian bike (which use the heaviest , cheapest metal available) you will have to change EVERYTHING ..
                        lightweight chassis
                        lightweight body panels
                        lightweight forged piston
                        lightweight internals - connecting rods, camshaft , crank , cylinder head , the cylinder itself


                        after all this maybe you can get the weight down by 30-35 kgs (just an assumption)
                        Chrome rims and bling ? get a real life !

                        http://www.facebook.com/GTR33

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                        • #13
                          And how do some bikes "feel" lighter and manage to mask their weight so well? Eg - Original pulsars were cumbersome at lower speed compared to the newer pulsars even though both have similar weight. How did the newer pulsar manage to remove this top heavy feeling? 17inch rims or something else too?
                          Your biking tells a lot about the person you are!

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                          • #14
                            Originally posted by themadrussian View Post
                            seriously speaking

                            if you get down to reduce weight of a typical indian bike (which use the heaviest , cheapest metal available) you will have to change EVERYTHING ..
                            lightweight chassis
                            lightweight body panels
                            lightweight forged piston
                            lightweight internals - connecting rods, camshaft , crank , cylinder head , the cylinder itself


                            after all this maybe you can get the weight down by 30-35 kgs (just an assumption)
                            @themadrussian
                            Buddy you hit the nail right at the forehead!!

                            Really with the design and make of the Indian bikes, single mindedly aiming towards reduced cost, there is not much scope left in our bike, except for changing EVERYTHING.....

                            But again, finding the right stuff is an issue, then the right mechanic and lastly would come the cost factor.

                            All that's finally left in our hands is to tweek the sprockets, air-filter, bigger jets, soft compound tyres etc.. etc... to make the bike more faster performance wise, but again, with a top blast of 18PS in my bike, the engine is just getting dragged to it's limit because the resultant weight has remained the same, and the increased speeds capability would try to churn the max from the mill!!
                            Twist your wrist and feel the shift!!

                            My own thoughts - Throttle

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                            • #15
                              Originally posted by abhijeet080808 View Post
                              And how do some bikes "feel" lighter and manage to mask their weight so well? Eg - Original pulsars were cumbersome at lower speed compared to the newer pulsars even though both have similar weight. How did the newer pulsar manage to remove this top heavy feeling? 17inch rims or something else too?
                              @abhijeet
                              I'm gussing The UGII pulsars (without the alloy) had a tad shorter wheel base, bigger head light faring (resulting in more weight shifting to the front) and a wider rear tyres.

                              So, when on the move..... I mean on real move, the resulting inertia comming from the rear tyre, made the bike feel lighter and due to the shorter wheel base cornering at low speeds were also made easy.

                              People who rode UGII, find UGIIIs not that exciting, because due to the heavier wheels, manuvering the bike at low speeds again became an issue. And also some of my friends say that pickup of UGIII have also gone down as compared to UGII!!

                              With my P200, with it's long swing arm, manuvering at low speeds is not a bliss!! Even the at high speeds the bike feels like a feather (the only condition is... you should have her tummy filled up)!!

                              So, basically it's not one but a combination of multiple factors that affect the manuvering capability of the bike.

                              I once rode a drag bike in US built arround a 1998 Suzuki GSXR 1000 eingine. Being a drag bike it had a custom swing arm to stop it from doing a wheelie during the quater mile blast off!! but you can understand what that custom swing arm might have done to the manuverability of the bike...!!
                              Twist your wrist and feel the shift!!

                              My own thoughts - Throttle

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