1978 Battery Box

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27 Nov 2012 09:43 #12672 by mike m
1978 Battery Box was created by mike m
Can anyone tell me what secures the battery in the battery box ? The box is bigger than the battery and I haven't been able to figure out how it's secured in the box. I even talked to a few Porsche mechanics and they had no idea.

Any help would be appreciated.

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27 Nov 2012 12:24 #12675 by martinss
Replied by martinss on topic 1978 Battery Box
On my '88 there is a clamp that holds the bottom of the battery. I'm not sure if the model years this applies to, but 928Intl have a used one: www.mailordercentral.com/928intl/prodinf...928%20611%20209%2002 - you can get half price in their current sale

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27 Nov 2012 22:47 #12689 by Kiln_Red
Replied by Kiln_Red on topic 1978 Battery Box
Hi,

Are you sure you have the correct battery fitted? There shouldn't be a whole lot of wiggle room. The 928 battery is huge. I am not sure about your MY, but on my cars the battery is situated by a bracket that fits onto the lip of the battery and is fastened by a 13/15mm bolt to the tray IIRC. I recall a discussion once where some owners with very early cars reported that there was no such bracket or other means for affixing the battery from the factory. :eek:

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28 Nov 2012 10:49 #12695 by wallyp
Replied by wallyp on topic 1978 Battery Box
The battery box on the early cars was attached to the rear suspension, not the body. There was a cover that attached directly to the battery box. None of this was attached to the body, or to the battery box access hatch in the bottom of the spare tire well.

Wally Plumley
928 Specialists
www.928gt.com

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28 Nov 2012 12:06 #12698 by linderpat
Replied by linderpat on topic 1978 Battery Box
the battery is not secured in the box by anything on my 78, which is stock and unmodifed there. It is a snug fit. It is also as Wally described.

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28 Nov 2012 12:07 #12699 by linderpat
Replied by linderpat on topic 1978 Battery Box
I should note that I have some foam in it to cushion the sides

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06 Dec 2012 19:04 #12787 by Ducman82
Replied by Ducman82 on topic 1978 Battery Box
its a little metal wedge that bolts down over the battery on the very back of the box. i just had to order up one form 928int as well today. mine was missing.

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06 Dec 2012 19:15 #12788 by xjadz928
Replied by xjadz928 on topic 1978 Battery Box
78 is different than all other years. Its very long (even longer than 79).

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07 Dec 2012 00:19 #12793 by 928mac
Replied by 928mac on topic 1978 Battery Box
gravity

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07 Dec 2012 09:07 #12799 by Ducman82
Replied by Ducman82 on topic 1978 Battery Box
should be a group 49 battery. same used up till mid 80's. then they went with the smaller ones.

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07 Dec 2012 21:23 #12807 by xstepson
Replied by xstepson on topic 1978 Battery Box
I think Jadz is saying that it's a larger battery still than the group 49.

Jim, Just because we're interested, can you get some measurements on the '78 battery?

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31 Jul 2013 14:54 #15483 by kjetilo
Replied by kjetilo on topic 1978 Battery Box
On my 78 ROW-model the batterybox has a "lid" fastend on the 4 bolts sticking
up from the batterybox itself with 4 nuts.

One model of the "lid" can be seen on page 902 in the PET-catalog (78 to 82 version).
The "lid" on my car is smaller, but serves the same function.

Note that the lid is made of metal, and the rubber-pieces underneat
the lid is NOT for fun! Without them a fatal short of the battery can occur!

Here in Europe the batterysizes is measured a bit different than in the US,
but I have used both 66Ah and 88Ah batteries. The latter fills the batterybox
to the rim :-)

--Kjetil

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