Technical Battery CCA for a 392 Hemi

I'm hoping to use a group 51 battery on my coupe. Its 500 CCA. I was using a 700 cca on a test stand. It always started effortlessly.

I'm not able to test the 500 CCA anytime soon. I want to build a hidden drop down box for the Group 51 battery.

I was hoping for some similar experiences from the group.

 

I think you would be cutting it close. It may work when the battery is new, but batteries start deteriorating from the minute they are made! Shortly after you install it, you could start having trouble. I always try to put the biggest battery possible in anything.






Bones

 

Stock? High-compression? Blower? Twin-turbos?

 

Take a look at some of the specialty batteries, such as Braille.
I'm using a Braille in my roadster, and they spin my built 355 SBC quite well. Quite small and weighs 21#. Forget the size dimensions and car is at my shop right now, but the Summit site has good info n them as does the Braille site.
I did however learn the hard way that AGM batteries don't come back from a discharged state well at all. It's best that during periods of inactivity that they stay hooked to a quality automatic charger such as a Battery Tender Plus.

 

I have been using group 26 batteries in a few cars, including the almost funny car with a 484 hemi...no problems...rated at 525 cca. Race cars need lighter batteries, street cars need batteries that you can replace easily if needed, cars that sit for a long time not being used need large batteries that are well maintained.

So there are a lot of things to think about.

 

Also, I seem to recall back in the olden days 40 years ago that 300 CCA or so was a decent battery rating. But my memory could be off a bit!

oh...yeah...I have a 1977 Sears catalog. Let's see. The best Die Hard (group 24) was rate at 500, the cheapest at 225. So I guess my memory isn't so bad, after all.

Either batteries have gotten better over the years, or marketing has.

 

Is 10:1 but otherwise mostly stock. 500 CCA but 650 CA. Its a group 51 battery. I am wanting to keep it under the dash, so size is my biggest concern here. And the group 51 works well - space wise.

Thanks

 

Just remember the battery is only part of the equation. The closer to the starter you can get it, the better. Putting it under the dash should shorten your cables. Also make sure you use large battery cables with good connections.
Also you starter needs to be in good shape, for easy starting! Make sure you use large enough wires and switches to trigger your solenoid. Just a few things to think about.








Bones