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Dimensionally smaller battery - need advice on cold cranking amp requirements

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    Dimensionally smaller battery - need advice on cold cranking amp requirements

    Folks,

    As part of my 1978 GS1000E custom build/restoration, I am thinking of downsizing the battery to make a bit more room for other stuff. If I dimensionally downsize the battery, it will have fewer CCA's than the original, which is rated around 220.

    Does anyone know the amp draw of the starter? Also, I will be running a LED headlight and LED tail light.

    What is the lowest CCA battery that is sufficient for these bikes? Just looking for ideas. I understand that it's a smarter idea to have a battery that has a bit more amperage than required as a safety factor.

    Thanks!
    Cogito ergo sum - "I think, therefore I am"
    René Descartes

    #2
    With a 78 can you turn the headlight off for starting? If not, you can do the headlight relay mod which will shut off power to the headlight while the starter is spinning.
    https://drive.google.com/open?id=0B9zH8w8Civs8ejBJWjdvYi1LNTg&resourcekey=0-hlJp0Yc4K_VN9g7Jyy4KQg&authuser=fussbucket_1%40msn.com&usp=drive_fs
    1983 GS750ED-Horsetraded for the Ironhead
    1981 HD XLH

    Drew's 850 L Restoration

    Drew's 83 750E Project

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      #3
      Obviously the easiest way to solve this is to go with a Lithium battery


      Comment


        #4
        Does your engine have higher than factory compression ratio?

        If so then you will need the cca battery due to starter kickback leading to starter clutch damage. I run a 8 cell Ballstic lithium in my 1000. Not enough cca's even at an advertised 210 cca, however I have an ignition retard lever installed and now my kickback has been eliminated. The battery is still inadequate but it still manages to get the bike started.

        Even with the headlight off it is inadequate/weak for starting unless the bike is well tuned and an easy starter.
        1978 Gs1085 compliments of Popy Yosh, Bandit 1200 wheels and front end, VM33 Smoothbores, Yosh exhaust, braced frame, ported polished head :cool:
        1983 Gs1100ESD, rebuild finished! Body paintwork happening winter 2017:D

        I would rather trust my bike to a technician that reads the service manual than some backyardigan that THINKS HE KNOWS how to fix things.

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          #5
          Problem solved:

          I went to Batteries & Bulbs today and walked around the store measuring batteries - I found this one, that has 225CCA @ 11.2 Ah. I used several of the Xtreme AGM batteries in other motorcycles and had good luck with them.

          Because it is an AGM and can be mounted on it's side, I will do just that - mount it on it's side and shorten the battery box. I know the battery box is from a G model - I'm going to modify it to fit my 78 GS1000E.



          My motor has a Wiseco 1100 kit in it with a compression ratio around 10.25:1
          Cogito ergo sum - "I think, therefore I am"
          René Descartes

          Comment


            #6
            The Yosh 1085 has 10.5:1, so be careful of kickback.

            There is a thread about how to reduce or minimize it.
            1978 Gs1085 compliments of Popy Yosh, Bandit 1200 wheels and front end, VM33 Smoothbores, Yosh exhaust, braced frame, ported polished head :cool:
            1983 Gs1100ESD, rebuild finished! Body paintwork happening winter 2017:D

            I would rather trust my bike to a technician that reads the service manual than some backyardigan that THINKS HE KNOWS how to fix things.

            Comment


              #7
              Originally posted by Fjbj40 View Post
              The Yosh 1085 has 10.5:1, so be careful of kickback.

              There is a thread about how to reduce or minimize it.
              I'm thinking about either a manual timing retard or a way to delay the ignition until the motor is spinning fast enough...
              Cogito ergo sum - "I think, therefore I am"
              René Descartes

              Comment


                #8
                Originally posted by philosopheriam View Post
                I'm thinking about either a manual timing retard or a way to delay the ignition until the motor is spinning fast enough...
                I assume you have seen this?

                Technical Info posts that are deemed to be important or popular will be placed here for easier access. If you feel a post should be moved from the Technical Info forum to here then PM the Administrator with your request.

                Comment


                  #9
                  That's the thread I meant to link.
                  1978 Gs1085 compliments of Popy Yosh, Bandit 1200 wheels and front end, VM33 Smoothbores, Yosh exhaust, braced frame, ported polished head :cool:
                  1983 Gs1100ESD, rebuild finished! Body paintwork happening winter 2017:D

                  I would rather trust my bike to a technician that reads the service manual than some backyardigan that THINKS HE KNOWS how to fix things.

                  Comment


                    #10
                    Forgive me if I didn't read far enough into the aforementioned thread, but did anyone try a relay tied into the oil pressure switch?
                    Cogito ergo sum - "I think, therefore I am"
                    René Descartes

                    Comment


                      #11
                      Originally posted by philosopheriam View Post
                      Forgive me if I didn't read far enough into the aforementioned thread, but did anyone try a relay tied into the oil pressure switch?
                      Not that I recall, but that may be an option depending upon your oil pump gears.

                      modern Headlamp cutouts use a stator wire and you might use that more reliably. The voltage is very proportional to RPM and you can set the threshold easier to what you like.

                      Comment


                        #12
                        Originally posted by posplayr View Post
                        Not that I recall, but that may be an option depending upon your oil pump gears.

                        modern Headlamp cutouts use a stator wire and you might use that more reliably. The voltage is very proportional to RPM and you can set the threshold easier to what you like.
                        posplayr,

                        I'm not trying to rehash the aforementioned thread, but for a motor that has stock oil pump gears, what about a delay-on-make relay that has a delay of 1 sec that in turn energizes a relay for the coils? I haven't put together the schematic yet, but having a delay on make timer that is triggered when the oil pressure switch OPENS (because there is oil pressure) then waits an additional 1sec before it energizes the coils. This should be more than enough of a delay to get the motor spinning.
                        Cogito ergo sum - "I think, therefore I am"
                        René Descartes

                        Comment


                          #13
                          You can give it a try but you might consider my comments here.

                          Technical Info posts that are deemed to be important or popular will be placed here for easier access. If you feel a post should be moved from the Technical Info forum to here then PM the Administrator with your request.

                          Comment


                            #14
                            Originally posted by posplayr View Post
                            You can give it a try but you might consider my comments here.

                            http://www.thegsresources.com/_forum...686#post813686
                            Posplayr - please look at the following schematic and let me know what you think






                            Last edited by philosopheriam; 10-18-2015, 01:15 PM.
                            Cogito ergo sum - "I think, therefore I am"
                            René Descartes

                            Comment


                              #15
                              You do not have a timing diagram about what you are trying to accomplish; I don't want to guess.

                              It is also not clear what the operation of the relay is when you have two active inputs. According to the description it will not operate with a +12V input on 87 and a ground on 87a simultaneously.

                              Note there is implicity 3 states available for each signal +12V, Open and Ground.

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