I'm looking for feedback on how bad this circuit idea is, before I go any further than daydream status with it.
The goal is a circuit to boost DC voltage from 12v to approximately 24v for the starter on a motorcycle, while adding less size and weight than a second battery. My idea is to use a few capacitors with a timer, a few logic bits and some MOSFETs. The caps would be repeatedly charged to 12v in parallel, then discharged in series to get the voltage boost. The OEM battery can deliver 80A @12v, so assume the starter motor draws 80A @12v. This battery will be replaced with a LiPo motorcycle battery that can deliver 200A @12V, so I think there will be enough supply power. I've got about 4" x 4" x 6" space to work with, so this will limit the capacitor size. I started doing the math on how quickly the caps can charge and discharge, and realized I'm missing a lot of data (and knowledge) and decided I would ask the general question before going further.
Is it possible this type of circuit would work, or am I way off the mark? Is there a better way to get a voltage boost with this much current from a physically small package?
The use case is for racing. The races are dead-engine start; when the whistle blows, the riders run to their bikes, start them and take off. Trimming a second or two off the starting time can significantly improve track position into the first corner.
The goal is a circuit to boost DC voltage from 12v to approximately 24v for the starter on a motorcycle, while adding less size and weight than a second battery. My idea is to use a few capacitors with a timer, a few logic bits and some MOSFETs. The caps would be repeatedly charged to 12v in parallel, then discharged in series to get the voltage boost. The OEM battery can deliver 80A @12v, so assume the starter motor draws 80A @12v. This battery will be replaced with a LiPo motorcycle battery that can deliver 200A @12V, so I think there will be enough supply power. I've got about 4" x 4" x 6" space to work with, so this will limit the capacitor size. I started doing the math on how quickly the caps can charge and discharge, and realized I'm missing a lot of data (and knowledge) and decided I would ask the general question before going further.
Is it possible this type of circuit would work, or am I way off the mark? Is there a better way to get a voltage boost with this much current from a physically small package?
The use case is for racing. The races are dead-engine start; when the whistle blows, the riders run to their bikes, start them and take off. Trimming a second or two off the starting time can significantly improve track position into the first corner.