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Tut Tut is offline
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Optima battery part #

I need to get an optima battery after I do the baking soda cleanup after finding fuzzy stuff under my battery. I got a part number from our host, but want to try to get the battery locally. The number our host list is OPT-825000. I can't seem to locate that number elsewhere. Is this the correct number?

I know I'll need to get the mounting adapter. I'll get that from our host.
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Tut
'87 Carrera coupe
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Last edited by Tut; 03-22-2008 at 02:39 PM.. Reason: made a mistake
Old 03-22-2008, 02:37 PM
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Optima 34/78 -->

http://www.optimabatteries.com/optima_edge/technical_specs.php#red1

Mine says SC34U...but that may be an older designation.
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Wil Ferch
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Old 03-22-2008, 03:01 PM
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I would think a Model 75/25 would also work. A bit longer but not as tall or deep.
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Old 03-22-2008, 08:26 PM
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Check this thread. It's a pic of the Optima I put in my 87 3.2
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Jim T.

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Old 03-22-2008, 09:40 PM
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optima battery/ 83 911sc
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Jim T.

87 911 Carrera
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Cat Bypass, SW Chip, 7's & 9's
Old 03-22-2008, 09:41 PM
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Wil and Jim,

Thanks.

Did you use the mounting adaptor from our host?
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Old 03-23-2008, 05:43 AM
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Optima has a new battery - at least new to me. It's the Yellow Top Group 51 and 51F. It's small and it's light. It's only 26 lbs. I'm thinking seriously about this one. Light is good.

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Old 03-23-2008, 05:56 AM
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Wil,

I see you are recommending the battery w/ greater capacity, by about 10%. Is this because of your location (Orchard Park is near Buffalo, right)?

I do use my car in temps down to about 30F.

What about saving the 5+ pounds w/ the 75/25? Is this weight savings worth the decreased capacity?

Also, anyone know why the chart shows 75/25 yet many threads here show pics of 75/35? Is this a new version?
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Old 03-23-2008, 11:23 AM
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Tut,

The battery comes with a mounting bracket. I fastened it to the battery floor and snapped the battery in. Tight as can be for road use. If I was to track the car I would further secure it but it is super solid for road use (even spirited).
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Old 03-23-2008, 08:58 PM
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Jim,

Did you purchase the battery from our host, or elsewhere? Did the bracket that came with your battery use the existing mounting clip and clamp, or did you need to fasten the bracket with mechanical fasteners? Picture?

Thanks.
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Old 03-24-2008, 03:27 AM
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The size battery I chose had nothing to do with Buffalo year-round temps as this is quite naturally a summer-only car for me.

The battery looks like a 6-pack and has mounting holes on the bottom to fasten to a plate ( not included). This plate can be cut to shape to fit the slot in the 911 battery compartment. You would use the "middle" of the three available (front) hold-down holes to accommodate various battery lengths.

Look for my name and Alan Dubuff for a nice write up with pics.

Maybe here--> Optima battery questions
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Wil Ferch
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Last edited by Wil Ferch; 03-24-2008 at 05:44 AM..
Old 03-24-2008, 05:40 AM
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The Bentley manual states that batteries for SCs have an Ah (ampere/hours) rating of 88. The 2 Optimas mentioned show only 42 and 50. This sounds like a significant difference. How important is this?
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Yellow 77 Sunroof Coupe/cork interior; 3.2L '80 SC engine/10.5:1/No O2; Carrera Tensioners; 11 Blade Fan; Turbo tie rod ends; Bilstein HDs; 28 tube Cooler; SSI, Dansk; MSD/Blaster; 16x7" Fuchs/205/50 Goodrich G Force Sport Comp 2; PCA/UCR, MID9
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Old 03-24-2008, 07:02 AM
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Tut,

I bought mine from the local Costco as I needed it fast. My old battery had split and was eating a hole through the side wall of my Carrera.

The Optima is shorter than the stock battery by a lot so the mounting hole and bracket will not work. I fastened the mounting tray with stainless screws.

I believe I saw a thread with pics of a really nice mounting set-up suitable for the track. I bet you can find it with a search
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Old 03-24-2008, 12:51 PM
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I think my earlier link with the Dubuff article is "that nice mounting set up with pics"...certainly good enough to get the point across.

The 88AH battery is the size used for that HUGE battery that comes stock for US cars. Wasn't always the case, and ( even ask LorenB !)...is NOT good as it puts a severe topping-up load on the alternator when it goes somewhat flat. Basically...Porsche always listed a 65 or 88 AH battery. No worries. That's why the various front mounting holes...to accommodate the various battery sizes ( lengths).
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Wil Ferch
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Old 03-24-2008, 01:24 PM
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So, what does this mean? If the factory recommends 65 or 88, why is 42 or 50 OK?

What exactly is an amp hour and how does it relate?
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Yellow 77 Sunroof Coupe/cork interior; 3.2L '80 SC engine/10.5:1/No O2; Carrera Tensioners; 11 Blade Fan; Turbo tie rod ends; Bilstein HDs; 28 tube Cooler; SSI, Dansk; MSD/Blaster; 16x7" Fuchs/205/50 Goodrich G Force Sport Comp 2; PCA/UCR, MID9
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Old 03-24-2008, 07:05 PM
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88 amp-hours means if there is draw of 1 amp...the battery will discharge for 88 hours.... basically how BIG the battery is.

If a car is not driven for (say) a week or more and looses charge...the poor alternator is pumping its guts out to "fill-up" that big mutha of a battery. A smaller battery simply stresses the alternator less. If you have a trickle charger ( or a computer-chipped charger) in-place while the car is idle a long time, the amount that the voltage drops during storage is less of a concern.
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Wil Ferch
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Old 03-24-2008, 09:06 PM
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Here's what I installed.


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Old 03-25-2008, 04:47 AM
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Nice install....as I often say here...please do yourself a favor and COVER the positive terminal with a rubber booty....don't want a welding machine there !! ..
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Wil Ferch
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Old 03-25-2008, 06:55 AM
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I just bought odyssey batteries for my 911e and they are a lot smaller than optima ones. they have plenty of cranking power for my engine and mount in just perfect.
Chris
Old 03-26-2008, 11:55 PM
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Quote:
Originally Posted by Paulporsche View Post
So, what does this mean? If the factory recommends 65 or 88, why is 42 or 50 OK?

What exactly is an amp hour and how does it relate?
An amp-hour is the product of the amount of current flow x time; i.e. it is (a figure of merit for) the capacity of the battery to deliver electricity.

A greater AH rating means the battery can crank the motor over more times, or in colder weather, or at least once after you left the headlights on for xx minutes in the parking lot, etc. IF you don't operate the car in Northern Germany or Finland, then you can get by with a smaller battery -- esp. true in SoCal. It is warm there (less load on battery, oil not as thick so less friction to turn over the motor, AND you are never able to escape an urban area, so you can stay in cell range and call a tow truck). Try that in the middle of Oregon, Wyoming or Montana and you might get yourself a deadly surprise if you freeze in winter, or die of thirst in summer, while waiting for the next car to come along.

There are other ways to measure too - e.g. Cold Cranking Amps (CCA), and others.

You have to be sure that any batteries you compare have the ratings done the same way.

The basic electrolytes are all the same - Pb plates in acid. Optimas have the lead plates curved into cylinders.

I like Optimas, but I would like a Li-ion or NiMH battery a WHOLE LOT MORE. Someday we will have them to save 30+ lbs. of wt. in our cars due to EV research...
Old 03-27-2008, 10:11 AM
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