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CC Advertisers
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 11Likes
03-15-2021, 09:24 AM
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CC Member
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Join Date: Feb 2018
Location: Lodi,
CA
Cobra Make, Engine: 427 manowar forged crank roller rockers . BIG CAM.
Posts: 785
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Not Ranked
cold cranking is not as important as reserve capacity in a car that sits a lot. Get the most reserve capacity you can find rv/boat type .
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03-15-2021, 09:35 AM
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CC Member/Contributor
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Join Date: Sep 2016
Location: (Beautiful) Sequim,
WA
Cobra Make, Engine: Pacific Roadster, 347 cu.in. 5-speed
Posts: 2,012
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Not Ranked
Both Cobras have Optima (Red top) finally changed the one in the 427 this year. Brought a NAPA (Gold top) AGM for the Mazda RX-7/V-8 car, seems just as good for far less money ?? Buying the best chargers, seem the ticket to a long lasting battery. Cheers TommyRot.
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03-16-2021, 05:28 PM
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CC Member
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Join Date: Jan 2008
Cobra Make, Engine:
Posts: 351
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Not Ranked
Costco, great battery. Good cranking and reserve, plus they will replace it if there is a problem, no questions asked.
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03-16-2021, 06:22 PM
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CC Member
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Join Date: Sep 2010
Location: Mineapolis,
MN
Cobra Make, Engine: SPF, 395 Stroker
Posts: 90
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Not Ranked
Picked up my new red top tonight. Close to $200 when all was said and done. I'm thinking WallyWorld or Costco might get a closer look next time around. For now I was happy just to find something that fit in the blasted battery box and would hopefully not have to come back out for quite some time. SAE cable will be hooked back up and the battery tender in place soon.
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03-17-2021, 04:19 PM
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CC Member
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Join Date: Jan 2020
Location: Raleigh,
NC
Cobra Make, Engine: Superformance, '65 427/MKIII with Roush V8 - 351W w/770cfm 4BBL Holley, 514hp
Posts: 48
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Not Ranked
Chucks1, when you install the new one.. start the car and see if you are getting 14.5-14.7volts at the battery. Once engine idles normally (800-900rpm) and fully warmed up with lights on and fans running .. you should see ~13.0-13.4volts at the battery.
Just confirm the alternator is putting out nicely and well grounded .
Useful link: Voltage drop when the fan is on
Many thanks.....
__________________
Many thanks,
Mark
Superformance: SPO2454 , Titanium w/Black Stripes
Engine: Roush 427SR w/770cfm 4-Barrel Holley
Transmission: Tremec TKO-600
Last edited by Moritz55; 03-17-2021 at 04:32 PM..
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03-17-2021, 05:22 PM
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CC Member
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Join Date: Sep 2010
Location: Mineapolis,
MN
Cobra Make, Engine: SPF, 395 Stroker
Posts: 90
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Not Ranked
Quote:
Originally Posted by Moritz55
Chucks1, when you install the new one.. start the car and see if you are getting 14.5-14.7volts at the battery. Once engine idles normally (800-900rpm) and fully warmed up with lights on and fans running .. you should see ~13.0-13.4volts at the battery.
Just confirm the alternator is putting out nicely and well grounded .
Useful link: Voltage drop when the fan is on
Many thanks..... |
Thanks for the suggestion Mark. My last battery was actually still good (although 10 years old) so this replacement is more of a preemptive strike than anything else, but I'll definitely check the voltage once I'm ready to actually start the thing up. |
04-19-2021, 05:03 PM
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CC Member
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Join Date: Dec 2001
Cobra Make, Engine: BDR
Posts: 536
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Not Ranked
Optima red top just bought new one to replace the old 13 year old one.
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04-19-2021, 05:35 PM
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CC Member
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Join Date: Mar 2020
Location: Scottsdale,
AZ
Cobra Make, Engine: FF Mark I, sprint car 347
Posts: 99
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Not Ranked
Odyssey this time. More cranking amp hours than red top for roughly same cost. Previously two red tops lasting 6 or 7 years,
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04-19-2021, 09:36 PM
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Senior Club Cobra Member
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Join Date: Mar 1999
Location: Honolulu,
HI
Cobra Make, Engine: CSX4141
Posts: 586
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Not Ranked
Chuck,
Running 2 6V Optima Red Tops. Just had to replace 1 of them since 2006, so its lasted for nearly 15 years. The other was just recharged and still working at full capacity!
- Bill -
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04-20-2021, 07:54 AM
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CC Member
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Join Date: Sep 2010
Location: Mineapolis,
MN
Cobra Make, Engine: SPF, 395 Stroker
Posts: 90
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Not Ranked
Thanks everyone for the thoughts and suggestions. I ended up with another red top as the path of least resistance, especially after having tried another battery that I ended up having to pull back out of my battery box (anyone with an SPF knows about these things). Hopefully this Optima gives me another 10+ years of life like the last one did.
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