Sports: Re: [DucatiST] Motolectric

Thanks for your clear postings Derek. It's good to see those who
understand the basics of electricity haven't deserted the list.

I've had a look at the website and have no doubt that fitting one of
Michael Heth's kits will improve starting on older bikes*, nor that
they're well made. However, I do wonder why he doesn't quote test
figures.

Corrosion of the terminals and the join between the terminals and copper
cable will increase the resistance of the starter circuit. How does
that compare with the resistance of the kit ? Also, how much resistance
does surface oxidation of the cable add? In theory, surface oxidation
reduces the cross section of wires, but I'd be suprised if the cross
section was reduced by even 1%. I'd also be interested to know just how
much oxygen is present in copper of normal purity and how its resistance
compares with OFC copper. Also, how much extra resistance is introduced
by the use of brass or steel terminals?

Like Nick Woods, I'm a fan of Odyssey batteries. The 9 year old PC680
in my M900 is still spinning the engine nicely. When the battery in my
ST gets tired, I'd like to replace it with an Odyssey. It's a shame that
Odyssey doesn't make its batteries in more sizes. I was lucky to find one
that's only a shade thicker than Monster's original, I haven't measured
up the space available for an ST battery. Mind you more companies are
producing Absorbed Glass Matt motorcycle batteries now, e.g. Westco,
but I don't know if they have the same characteristics as the Odyssey.
They do increase the range of sizes available to us.

* Personally, I carefully clean the metal oxides and salts off all the
terminals with files or emery first. I imagine that that's included in
the instructions with the kits. If that did't work, then I'd suspect
the crimped connections and maybe replace the cables

--
Jan
On the road:'03 ST4s ABS (since April), '99 M900 (since new)
Languishing: 2 'Guzzis & a flying brick
Norwich, UK

Derek Blackie, on Mon, Aug 30, 2010 at 04:56:26PM +0100 you wrote:
>
> On 30/08/2010 15:27, "james duncan" <[1]awpptdt@yahoo.com> wrote:
> > When the load on the battery is increased, the battery voltage drops.
> Agreed
> > If the starter cable increases the load then the battery must over
> come this
> >load as well as the starter load.
> The starter cable doesn't increase the load, it increases the
> resistance.
> More resistance = less current
> > If you have access to a battery tester hook it up
> > and gradually increase the load and watch what happens to to the
> battery
> > voltage or hook a multimeter to the battery. If you have a good
> strong battery
> > the voltage will drop a volt or two, a poor battery will drop 5 or 6
> volts and
> > hence a slow dragging start.
> Yes, Because of the internal resistance of the battery, which is higher
> in a
> poor battery.
> Derek
> --
> '03 ST4s abs
> Scotland
> > From: Derek Blackie <[2]d.w.blackie@dundee.ac.uk>
> > To: st2_owners <[3]st2_owners@yahoogroups.com>
> > Sent: Mon, August 30, 2010 5:24:01 AM
> > Subject: Re: [DucatiST] Motolectric - Odyssey
> >
> >
> > I fail to see your reasoning here. The higher resistance of the
> starter
> > cable does indeed drop the voltage to the starter but it DOES NOT
> drop the
> > voltage at the battery and hence to the ECU etc.
> > The voltage to the ECU and other systems will only drop dependant on
> the
> > internal resistance of the battery - unless they were connected to
> the
> > starter terminal which they aren't!
> >
> > Derek
>
>
> References
>
> 1. mailto:awpptdt%40yahoo.com
> 2. mailto:d.w.blackie%40dundee.ac.uk
> 3. mailto:st2_owners%40yahoogroups.com
> 4. mailto:d.w.blackie@dundee.ac.uk?subject=Re:%20[DucatiST]%20Motolectric%A0%20-%20Odyssey
> 5. mailto:st2_owners@yahoogroups.com?subject=Re:%20[DucatiST]%20Motolectric%A0%20-%20Odyssey
> 6. http://groups.yahoo.com/group/st2_owners/post;_ylc=X3oDMTJyZjk0bDFmBF9TAzk3MzU5NzE0BGdycElkAzEwOTkxMjIEZ3Jwc3BJZAMxNzA1MTI2MjY0BG1zZ0lkAzExNDY1NQRzZWMDZnRyBHNsawNycGx5BHN0aW1lAzEyODMxODM3OTg-?act=reply&messageNum=114655
> 7. http://groups.yahoo.com/group/st2_owners/post;_ylc=X3oDMTJlbHRnZmlmBF9TAzk3MzU5NzE0BGdycElkAzEwOTkxMjIEZ3Jwc3BJZAMxNzA1MTI2MjY0BHNlYwNmdHIEc2xrA250cGMEc3RpbWUDMTI4MzE4Mzc5OA--
> 8. http://groups.yahoo.com/group/st2_owners/message/114640;_ylc=X3oDMTM4NzVtYnByBF9TAzk3MzU5NzE0BGdycElkAzEwOTkxMjIEZ3Jwc3BJZAMxNzA1MTI2MjY0BG1zZ0lkAzExNDY1NQRzZWMDZnRyBHNsawN2dHBjBHN0aW1lAzEyODMxODM3OTgEdHBjSWQDMTE0NjQw
> 9. http://groups.yahoo.com/group/st2_owners/members;_ylc=X3oDMTJmdmgxbzZhBF9TAzk3MzU5NzE0BGdycElkAzEwOTkxMjIEZ3Jwc3BJZAMxNzA1MTI2MjY0BHNlYwN2dGwEc2xrA3ZtYnJzBHN0aW1lAzEyODMxODM3OTg-?o=6
> 10. http://groups.yahoo.com/group/st2_owners;_ylc=X3oDMTJlcms1YmYwBF9TAzk3MzU5NzE0BGdycElkAzEwOTkxMjIEZ3Jwc3BJZAMxNzA1MTI2MjY0BHNlYwN2dGwEc2xrA3ZnaHAEc3RpbWUDMTI4MzE4Mzc5OA--
> 11. http://us.ard.yahoo.com/SIG=15oanrcls/M=493064.13983314.14041046.13298430/D=groups/S=1705126264:MKP1/Y=YAHOO/EXP=1283190998/L=2c6d20de-b44f-11df-9f80-5776dc47c2b0/B=pkdwKdj8fbk-/J=1283183798571621/K=Bp4z7pgMDxTDSRkI9S4wPw/A=6060255/R=0/SIG=1194m4keh/*http://us.toolbar.yahoo.com/?.cpdl=grpj
> 12. http://us.ard.yahoo.com/SIG=15o0taoev/M=493064.13814537.14041040.10835568/D=groups/S=1705126264:MKP1/Y=YAHOO/EXP=1283190998/L=2c6d20de-b44f-11df-9f80-5776dc47c2b0/B=p0dwKdj8fbk-/J=1283183798571621/K=Bp4z7pgMDxTDSRkI9S4wPw/A=6078812/R=0/SIG=114ae4ln1/*http://dogandcatanswers.yahoo.com/
> 13. http://us.ard.yahoo.com/SIG=15o5uttf6/M=493064.14012770.13963757.13298430/D=groups/S=1705126264:MKP1/Y=YAHOO/EXP=1283190998/L=2c6d20de-b44f-11df-9f80-5776dc47c2b0/B=qEdwKdj8fbk-/J=1283183798571621/K=Bp4z7pgMDxTDSRkI9S4wPw/A=6015306/R=0/SIG=11vlkvigg/*http://advision.webevents.yahoo.com/hobbiesandactivitieszone/
> 14. http://groups.yahoo.com/;_ylc=X3oDMTJkNmhiZ20xBF9TAzk3MzU5NzE0BGdycElkAzEwOTkxMjIEZ3Jwc3BJZAMxNzA1MTI2MjY0BHNlYwNmdHIEc2xrA2dmcARzdGltZQMxMjgzMTgzNzk4
> 15. mailto:st2_owners-traditional@yahoogroups.com?subject=Change%20Delivery%20Format:%20Traditional
> 16. mailto:st2_owners-digest@yahoogroups.com?subject=Email%20Delivery:%20Digest
> 17. mailto:st2_owners-unsubscribe@yahoogroups.com?subject=Unsubscribe
> 18. http://docs.yahoo.com/info/terms/

--
Jan