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Old 04-30-2012, 10:53 PM
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Minimun battery size/capacity, race car

no accesories electrical system, race car only, what would the minimum size battery I should use just to crank the engine, it's a supercharged SBC with only 7.8:1 CR so no need for a big starter motor.

I'm thinking a small 55 a/h like 350 CCA batt from a corolla will be enough

it jump starts stock SBC just fine, no need to crank for more than a few seconds. maybe even a smaller batt?

I'm in a quest to save weight as much as possible

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Old 05-01-2012, 03:27 AM
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Are you using a charging system....electric water pump etc?

A larger battery in the rear may be of an advantage......
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Old 05-01-2012, 03:53 AM
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A Miata battery is about half the size of even the smallest battery that fits in a normal car..... full 12v etc... I have one in my dune buggy.
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Old 05-01-2012, 09:57 AM
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Quote:
Originally Posted by poncho62
Are you using a charging system....electric water pump etc?

A larger battery in the rear may be of an advantage......

35 amp alternator, MSD box and large coil, no other electrical accesories, I was also thinking of installing a larger pulley in the alternator.

the batt goes in the rear, just behind the cab.
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Old 05-01-2012, 10:01 AM
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Quote:
Originally Posted by EOD Guy
A Miata battery is about half the size of even the smallest battery that fits in a normal car..... full 12v etc... I have one in my dune buggy.

what size is that battery? amp/hour rating?
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Old 05-01-2012, 10:19 AM
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Race Engines with high compression need Amps-I would recommend this:

http://www.summitracing.com/parts/XSP-D1600/
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Old 05-01-2012, 10:55 AM
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Quote:
Originally Posted by 35WINDOW
Race Engines with high compression need Amps-I would recommend this:

http://www.summitracing.com/parts/XSP-D1600/

my friend you didn't read my first post:

it's a supercharged SBC with only 7.8:1 CR so no need for a big starter motor.

supercharged race engines have low compression, no need for big amps or starter motors.
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Old 05-01-2012, 03:42 PM
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I'll ck on it and post
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Old 05-01-2012, 03:46 PM
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labels were gone... but this is the one I bought ..... looks like 370 CCA

http://www.interstatebatteries.com/c...430-2147384906
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Old 05-01-2012, 09:33 PM
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I think your link gave me a true clue of why such big batteries are often used by the OEM:

" this 370 CCA automotive battery will meet or exceed your vehicle`s starting requirements in any hot to moderate climate"

I guess a small, light weight battery will not crank over in cold weather, so they use big ones jut to be sure. We have here temperatures in the 70's and up all year long so there'll be no climate issues.

this battery weights 20.5 lbs, the ones I use with V8's weight 32+ lbs.

there is a big difference here.

btw, I checked and the miata is a 45 amp/hour bat, the chevy's is 65 amp/h

I made this experiment this afternoon, and a little 36 amp/h battery from a Geo Metro cranked up very well a stock chevy 350 engine that has more compression than mine.

thanks a lot amigo.
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