batterys

Boydskyking · 08-15-2010, 07:40 PM

I have a 1969 porsche 912 that has places for two batterys.Does anybody know where I can buy the batterys that fit my car

Flieger · Flieger's Garage

I believe 911s were actually in parallel: 2 batteries both 12 Volt. The two big batteries were just to replace the big iron weights and increase the polar moment of inertia to make the car less twitchy (or agile). I just use a little utility interstate, almost a motorcycle battery.

RichardM912 · 08-16-2010, 03:19 PM

I use a 1969 912 as my daily driver in an urban environment. As I understand, 911s of that vintage had two 12 volt batteries - one in each front corner - connected in parallel. 912s had a single battery.

I have installed two batteries for peace of mind. 912s have dynamos (generators) not alternators and these do not charge the battery as efficiently at low revs (idle). Also I notice at night, with lights and wipers on, the charge light glows very faintly at idle.

I use standard automotive batteries. I had no trouble finding ones to fit. Just be careful that the terminals/connectors do not touch the body. I have also installed an isolation switch. Otherwise it is a bit of a pain to have to disconnect two batteries when you want to isolate the electrics.

Finally, it is probably prudent to have both batteries fully charged before connection. I am not an expert but I avoid connecting a pair of batteries in parallel if they are not in a similar charge state.

Mr. Magoo · 08-17-2010, 09:52 AM

I used the Westco Miata battery in my '67. Works great and small enough to fit. Also sealed so no risk of leaking.

Boydskyking · 08-22-2010, 06:00 PM

I have a 69 912 which I am installing the oil cooler. It has the floating oil cooler. I have installed the lower seals including the o-rings.I ordered all the parts for the installation but dont know how the top portion installs. I have a round rubber bushing with a washer,screw and a small metal bushing. The fan housing has a hole that is the size of the ribber bushing that is right at the top of the cooler. does it go there.Where does the rest of the stuff go.

Thanks

RichardM912 · 08-24-2010, 02:06 AM

Re your oil cooler, I think you have become attached to the wrong thread.

On your cooler, there is presumably a "fin" at the top with a hole near the top of the fin and a captive nut behind the hole. This hole will line up with one in the cooling air shroud. You should have a bolt (screw), a steel washer, a rubber bung with a hole through it and a short length of steel tube.

The steel tube fits inside the bung. Put the washer on the bolt and the steel tube in the bung. Working through the fan hole, position the bung correctly and feed the bolt in from outside the shroud, through the steel tube in the bung and screw it into the captive nut. The steel tube is just to stop you over-compressing the bung.