Posted by buickanddeere on January 20, 2010 at 15:59:00 from (209.240.122.111):
In Reply to: Re: 8 volt battery posted by teddy52food on January 20, 2010 at 10:31:28:
Power = volts X amps. Loose the volts and power goes down even when the current stays up. Current is what makes ampere/turns which is how many gause of magnetic force. If the magnetic force dropped, the torque would drop. The motor would quit cranking. Torque is proportional to current. Torque to crank the engine varies little if 20 or 100rpm. It's current for cranking torque X volts to get rpm. With electric motors, keeping the voltage up is everything. Just going to an extra large 6V battery and cables which keeps 5.5V cranking voltage instead of 4.5V of a weenie battery and cables. Makes the difference of having enough voltage for the plugs to fire. It also allows the starter motor to make 1.5 times more power. That's were the 8V battery usually figures as a farmer fix for small dirty cables and an undersized 6V battery. Even after loosing 2.5V the electrical system sees about 5.5volts as a sound 6V system would see. The trade off in shortened lamp,coil and point life isn't worth it. Then again most old hack job tractors had the lights knocked off in collisions before the 8V battery was installed.
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