electrical drain

twodear · Post by **twodear** » Mon Jan 16, 2006 8:43 am

I was wondering if anyone has information regarding the current draw of the ignition and injection systems?

I'm planning to eliminate the Lizards starter motor (push start or more probably a roller starter) and as a result the battery size can be reduced.

I'm wondering about eliminating the alternator as well, but what sort of amphour battery will I need to sufficiently power the injection and ignition for, well...an hour?

Is there an option to eliminate the battery and run it on the alternator alone? I'm thinking no, but I have to ask.

boxerpan · Post by **boxerpan** » Mon Jan 16, 2006 1:05 pm

Total loss systems for racing still require the battery, one of wingers contacts has been using the Odyssey 310 on the Ducati and I think it's worked out fine.

twodear · Post by **twodear** » Mon Jan 16, 2006 7:52 pm

boxerpan, thanks

I found this on the web...no weight is listed though.
http://www.odysseysoutheast.com/pc310-battery.php

Ade B · Post by **Ade B** » Mon Jan 16, 2006 9:15 pm

have a total (dead

) loss racing set up on the R6 - use a standard gel battery and it does a whole track day. We hook it up to an optimate between sessions just in case.

Ade

boxerpan · Post by **boxerpan** » Tue Jan 17, 2006 7:06 pm

twodear wrote:boxerpan, thanks

I found this on the web...no weight is listed though.
http://www.odysseysoutheast.com/pc310-battery.php

Approx 2.7kg for the 310.

It was just an example of what folks are using. The 540 (just) or 680 will fit in the BMW battery tray.

oyster · Post by **oyster** » Tue Jan 17, 2006 7:15 pm

So much better if you can junk the alternator, about 6Kg in weight AND no drag on the engine from it. Almost any battery designed to turn a starter motor would work, gel even better as they can be fitted any way except upside down. Optimate between races. At this point I would make a new dedicated wiring loom, retain some in line fuses, and junk all the rest too. Soldered connections are better than plugs. I have seen 'battery eliminators' on ebay, made in USA, for all sorts of machines - may be of help to you instead of the above. I think it requires the alternator to power it and bump starts.

twodear · Post by **twodear** » Wed Jan 18, 2006 8:41 pm

All good tips, thanks muchly.

The alternator will go onto the bench. I'll relocate the battery to where the alternator sat which will also allow a better air induct path.