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Why 2 batteries?
- Thread starter C4UKPOR
- Start date
mark pearce
Singapore
- Joined
- 6 May 2004
- Messages
- 2,896
were they 6 volt batteries?
i believe a lot of 50/60's cars used them
i believe a lot of 50/60's cars used them
The early 911s were 12 volt. Some of the 356s were 6v.
The reason for the two batteries in early 911s is commonly said to be for optimised weight distribution. Rather than having one big battery on the left have one smaller battery each side to balance out. However I personally think this is a bit of a myth.
I other explanation I have read is that large batteries with high cranking amps were not generally available (and very expensive) in those days. For the 911 engine, being high compression, they were at the limit of a normal car battery and needed to go larger. The only realistic option was then to go to two batteries and once forced down that route it made sense to place them on opposite sides of the front compartment.
Yes you can change to one single modern battery these days if you wish but the two work perfectly fine so no real incentive to change. They are connected together by two heavy duty cables so in essence operate as a single battery. It is a very simple change to make.
Ian.
The reason for the two batteries in early 911s is commonly said to be for optimised weight distribution. Rather than having one big battery on the left have one smaller battery each side to balance out. However I personally think this is a bit of a myth.
I other explanation I have read is that large batteries with high cranking amps were not generally available (and very expensive) in those days. For the 911 engine, being high compression, they were at the limit of a normal car battery and needed to go larger. The only realistic option was then to go to two batteries and once forced down that route it made sense to place them on opposite sides of the front compartment.
Yes you can change to one single modern battery these days if you wish but the two work perfectly fine so no real incentive to change. They are connected together by two heavy duty cables so in essence operate as a single battery. It is a very simple change to make.
Ian.
Thanks for the info. 2 batteries seem to have life in them so perhaps I'll stick with them for now. I do like the idea of updating the fuse/relay box and some of the wiring at some point and maybe then replacing with a single new battery.
Harvey.
Harvey.
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