Cranking amps required to reliably start a super late model

[Burke1118]

Looking around at some of these battery options: lithium, 16v, good ole 12v and all the numbers are getting me confused. For our purposes, I would think the most important metric would be cranking amps, and weight? Does that sound right to those that know more about electricity/batteries?If true, what cranking amps would be required to start a dirt late model?

[TheJet-09]

I've used the yellow top Optima, which is a deep cycle rated at 750cca. I currently use an XS 16-volt, which is listed as 675cca. Both crank/ed good enough.

You might want to look at amp hours, which I by no means can explain. But it appears to be a discharge rate of sorts. The XS I mentioned has an amp hours rating of 50. I didn't see one listed where I looked up the Optima, but it also sounds like those numbers can be confusing based on how it's rated.

[Jking24]

Amp hours are the more important thing most any battery has enough cranking amps to crank the engine it's amp hires that matter that's basically a measurement of how much capacity a battery has ie. How long it will last before dying but beware not all amp hour ratings are done the same. Some creative advertising goes on in that department lol

[CCHIEF]

Any good battery will start an engine with a good working starter. Cutting the ignition in after the engine is spinning will save power for ignition during the race. A 16V battery is the best deal for your ignition to work @ it's best...especially with a higher draw box like a MSD 7. But they all work their best, and for 100 lappers with a 16v, or run an alternator...and no one does that in a late model I ever seen. Best practice is to charge the battery all night between events. Search around the net, you'll find info on MSD systems requiring a fully charged battery voltage >12 volts. Example from MSD tech: https://forums.msdperformance.com/sh...ltage-minimums Check your voltage after a race with the car running...you may be surprised what your leaving on the table. A full charged battery reads 12.7 volts.... after the surface charge is removed.