If you change from a 12v battery (no alt)to a 16v battery, do you use less amps to accomplish the same things, ie, starter cranking, fuel pump, fan, water pump, line locks, ect.
For example, if it takes 100 amps to crank the engine with 12v, then crank the same engine /w the same starter with a 16v battery, does it only take 66 amps? In other words, does a 30% increase in volts equal a 30% decrease in amps?
Thanks,

Brian Dunnigan

This is where Ohm's Law comes in handy

Don't forget the power factor...Tim

you will never figure out whats going on by a formula someone posts... not in the real world.
It would take many, many hands on measurements to even be close.
BTW
Hey Brian
How ya been?

Brian, a battery is a lot like a fuel tank when you don't use a charging system, you put in so much fuel and the car takes it out as you run it The resrve capicity ( I think) determines how many amps the battery will store, Ohms law says that if you increase the volts it will take less amps to accomplish the same amount of work If you used a 16 Volt battery with 500 amp hour reserve capicity and did no charging at the track the voltage will drop as the reserve capicity is used up, same thing on any battery with no charging system. If you used a 12 Volt 1000 amp hour battery it would probally last longer than the 500 amp hour 16 voly battery would in the same application I'm to lazy to get the elecrtric math book out and find the formulas to do the math and post it, sorry.Do you monitor the battery voltage? If not it would be a good idea to put a good volt meter in the car that you can use I usually charge my batterys(two large high capicity RV/Marine batterys) for two or three days before the race using a 3 amp trickle charger, the batterys will be charged up to 14.2 volts and drop down to 13.6 float voltage with no usaged or lower depending on how old and how the batterys have been used. Once I start the car and load it, drive it around the pits and race tha car the voltage will slowly drop down to 12.56 or so by our lunch break. I put my 6 amp charger on the batterys at the lunch break, the break lasts around a 60 minutes before I have to start and race the car agian, the volt meter will show 14.0 or close to it in that hour but the float voltage(let it sit for 15 minutes)will drop down to 13.2 or so. My alternator puts out 14.25 volts according to my volt meter and the amp meter will show 45 to 60 amps on start up and slowly drop down to 30 amps. I have a electric fuel pump, Magnafuel 275 or 300 depending on which motor is in the car and a MSD 7C ignition box, no eletric fans, water pump or any other voltage drains when racing in the daylight. Sorry for the long post ,:o IHTHs