Since '02 xBhp is different things to different people. From a close knit national community of bikers to India's only motorcycling lifestyle magazine and a place to make like-minded biker friends. Join us

Axor
Magazine
Castrol Power 1

Fatigue, sleepiness, & alcohol are the same.

Our Partner

Announcement

Collapse
No announcement yet.

knocking in bikes at high speeds!!

Collapse
X
Collapse
 
  • Page of 1
  • Filter
  • Time
  • Show
Clear All
new posts
Previous template Next
  • #1

    knocking in bikes at high speeds!!

    have you ever noticed any knocking in your bike during a drag?? at high rpm the r15 was knocking after shifting from 3 to 4 gear??? why did that happen?
    strange but true that this happened in the R15!!!! never thought this would happen in this bike at 9500 rpm since its a high rpm bike!!!!

    any such experiences in your biking????
    LosT in TimE!!!
    Tags: None
  • #2
    Query Approved
    Join xBhp On

    Comment

    • #3
      does this happen due to the fuel injection in the bike?? i have heard that this bike has a closed loop system to control the fuel and air supply according to need!!! is it having a problem due to the less flow of fuel or something like that???
      LosT in TimE!!!

      Comment

      • #4
        Send a pm to joel, he is the right person to answer this.
        Move on.........
        bappaditya @ +919804822971.

        Comment

        • #5
          Thats the rev limiter cutting in, not the engine knocking. it starts from 9800 rpm till 9950-10,000 rpm.


          My offerings to the gods of speed -

          - KTM Duke 200
          - Yamaha RXZ 5 speed


          Comment

          • #6
            Originally posted by nykmeister View Post
            have you ever noticed any knocking in your bike during a drag?? at high rpm the r15 was knocking after shifting from 3 to 4 gear??? why did that happen?
            strange but true that this happened in the R15!!!! never thought this would happen in this bike at 9500 rpm since its a high rpm bike!!!!

            any such experiences in your biking????
            ive noticed it in high performance machines..the compression ratio is very high. and when adulterated or fuel that needs low compression to burn,is used, it knocks.. in short all i can say is u may be using slightly adulterated fuel. are u facing this prob at high speeds or high rpms?

            when at high rpms fuel should have the capability to burn up almost instantaneously...if it doesnt the engine knocks.
            My BiKe DoEsN't LeAk OiL, iT mArK's ItS TeRriToRy !

            sigpic

            Comment

            • #7
              And just for info's sake, the R15 does not run a closed loop system. Its an open loop system.

              The knock might have been because of poor fuel, although even I think its more likely you banged into the limiter before shifting up, and mistook it for a knock.
              You get the point?? :D
              -----------------------
              sigpic

              Comment

              • #8
                i have been using normal fuel for the bike!! never used speed or power!!! may be its of the bad quality!!
                and sorry for the closed loop system thing!!!
                LosT in TimE!!!

                Comment

                • #9
                  Originally posted by jd666 View Post
                  Thats the rev limiter cutting in, not the engine knocking. it starts from 9800 rpm till 9950-10,000 rpm.
                  whats a rev limmiter???? the red line on the rpm meter????
                  LosT in TimE!!!

                  Comment

                  • #10
                    Originally posted by nykmeister View Post
                    whats a rev limmiter???? the red line on the rpm meter????
                    A revv. limiter prevents the RPM from going over a limit, which is defined for it. You can say that it cut's-off engine after a particular RPM(setted by manufacturer) is reached.

                    Comment

                    • #11
                      ^^ what he said


                      My offerings to the gods of speed -

                      - KTM Duke 200
                      - Yamaha RXZ 5 speed


                      Comment

                      • #12
                        Originally posted by jd666 View Post
                        Thats the rev limiter cutting in, not the engine knocking. it starts from 9800 rpm till 9950-10,000 rpm.
                        I think he is right !
                        Presently own :
                        RE Classic 500
                        Yamaha RD 350
                        Yamaha FZ-s
                        Vespa 150
                        RE Ensign
                        AJS 350
                        Honda Activa x2
                        Kinetic Honda
                        Hercules Roadeo a200

                        sigpic

                        Comment

                        • #13
                          Originally posted by nykmeister View Post
                          i have been using normal fuel for the bike!! never used speed or power!!! may be its of the bad quality!!
                          dude no issues with using normal fuel (as long as it doesn't smell kerosene) in R15.The engines released here have gone rigorus testings and all prior to release and can run on ordinary 87 octane fuel.It'll be the same for some extent of ENGINE modifications.U need high octane only if u have played with comp.ratios to serious levels.

                          Comment

                          • #14
                            Originally posted by Nithin.J View Post
                            dude no issues with using normal fuel (as long as it doesn't smell kerosene) in R15.The engines released here have gone rigorus testings and all prior to release and can run on ordinary 87 octane fuel.It'll be the same for some extent of ENGINE modifications.U need high octane only if u have played with comp.ratios to serious levels.
                            Dude.. I dont think thats right.. R15 compression ratio is 10:4 and any engine above 10:1 needs a premium fuel (not high octane 97 but Octane 91 would suffice). The engine is desgined to use premium fuel. Compression ratio of 9:1 (Most of the Indian bikes) are desgined for regular fuel (87 octane).

                            Comment

                            Previous template Next
                            Working...
                            X
                            © xBhp.com 2026. All rights reserved.
                            Designed by xBhp