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Designer King
 
Paulporsche's Avatar
 
Join Date: Mar 2004
Location: Toronto, ON Canada
Posts: 5,499
Will I need a larger battery for my starter and CR?

I have a modified 1980 engine which has 3.2L and a 10.3:1 compression ratio. I also have a high torque starter.

I would like to go to a Group 48 sized AGM battery to replace the current 49 lead acid one in order to save about 10-15 pounds.

The car is used nowadays only in warmer temps, say above about 2C or so.

What do you think. Can I go with the Group 48 AGM? Thanks.

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Paul
Yellow 77 Sunroof Coupe/cork interior; 3.2L SS '80 engine/10.3:1/No O2; Carrera Tensioners; 11 Blade Fan; Turbo tie rods; Bilstein B6; 28 tube Cooler; SSI, Dansk; MSD/Blaster; 16x7" Fuchs/205/50 Firestone Firehawk Indy 500s; PCA/UCR, MID9
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Old 05-15-2020, 08:01 AM
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Join Date: Jan 2007
Location: Phoenix, AZ
Posts: 858
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Paul,
You should be fine . . . we use a garden tractor battery in our race car with 12.5CR 3.8L race engine . . .cranks great !!

Regards,
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Previous Porsches: 1958 356 Red Coupe - 1972 914 Blue -1972 911T Coupe Aubergine
Old 05-15-2020, 08:37 AM
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Join Date: May 2004
Location: Boulder, Colorado
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The geared high torque (and lighter) starters really do the trick. What you don't get with smaller batteries is duration - if you are having troubles starting, you can't keep cranking for as long or often.
Old 05-15-2020, 10:12 PM
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Join Date: Feb 2009
Location: Boulder Creek CA
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Quote:
Originally Posted by Walt Fricke View Post
The geared high torque (and lighter) starters really do the trick. What you don't get with smaller batteries is duration - if you are having troubles starting, you can't keep cranking for as long or often.
This^, if you want to insure great cranking replace your positive cable with a larger gauge cable, less amperage lost to heat. Add an extra ground strap, do everything you can to eliminate resistance.

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Old 05-16-2020, 08:18 AM
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