Vented Battery?
10-29-2002, 09:54 PM
#1
Three Wheelin'
Thread Starter
Vented Battery?
Is my '81 SC equipped with a battery vent tube? I bought a DieHard today, and it comes with a tube attachment to vent the battery outside the trunk. My 993 has such a tube in the car, but the SC doesn't appear to have one. It had a Porsche battery before, but it only lasted 3 years and a new one costs $180, vs $100 for the "6-year" DieHard. The Porsche battery was not vented outside the trunk. Can I use the DieHard without venting it outside the trunk? Is the vent tube in there and I just can't find it? A quick look at the owner's manual showed no mention of the vent. <img src="confused.gif" border="0">
10-30-2002, 07:49 AM
#2
Rennlist Member
Your '81 does not have a vent tube. I just left the hose off, when I changed the battery in my '83. I would like to hear whether anyone has "updated" to the outside vent, and how they did it.
10-30-2002, 10:24 AM
#4
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Speed..it's routine for battery gas to damage compartment carpeting/at least..a bad alt. regulator may create an over-voltage condition which cooks battery electrolite, thus mucho gas..and this over-voltage condition will not alert you on the dash "G" light..a volt gauge could save you big headaches. especially damage to electrics..not a pro on this........Ron
10-30-2002, 12:19 PM
#5
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This off-gassing into the 'luggage' area also accelerates the corrosion between contacts in the fuse block -- which then shows up as intermittent, fuel pump, power windows, etc.
10-30-2002, 11:43 PM
#6
Three Wheelin'
Thread Starter
Thanks for the input. Does anyone know of a better (cheaper) source for a Porsche OEM battery than a dealer? Does anyone know of a replacement battery that does not need to be vented externally?
10-31-2002, 12:05 AM
#7
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Speedracer, the only one I know of is Optima battery which is a sealed unit. Venting is no problem.
Ususally, the non-sealed battery has a small orifice coming out the side of it or somewhere close to the top. Just take out one of the small floor plugs in the jack storage and front A/C fan area and route it down and around the front A/C condenser (if A/C equipped) and let is hang about 1 1/2" below the suspension. Works like a charm.
Spider911
88 Carrera
Ususally, the non-sealed battery has a small orifice coming out the side of it or somewhere close to the top. Just take out one of the small floor plugs in the jack storage and front A/C fan area and route it down and around the front A/C condenser (if A/C equipped) and let is hang about 1 1/2" below the suspension. Works like a charm.
Spider911
88 Carrera
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10-31-2002, 09:24 AM
#8
Rennlist Member
I just use the Interstate. Since Porsche began to source US batteries, I don't see a difference. Also, the Interstate is available in the smaller size. You'll see several threaded holes for the battery hold down, corresponding to three sizes of battery. The one that Interstate supplies for 911s is the middle size, which was standard in Europe. It's a popular size battery for Mercedes and BMW, so it's widely available. I paid $60 for mine this summer. The smaller size is perfectly adequate, especially if you don't have A/C, or don't run your A/C in traffic a lot.
The Interstate does have a vent, and now I'm going to route it to the outside.
The Interstate does have a vent, and now I'm going to route it to the outside.
10-31-2002, 12:15 PM
#9
Do use a vent if a normal battery. Floor plug is an ideal place , as mentioned. Acid/ corrosion / electrical problems otherwise..as stated. Optima is good, no vent.
Don't go with "huge" ( size 49) OEM battery. Slightly smaller size 48/91 ( Interstate) works well, can use one of three bottom threaded connections for hold-down for smaller batteries. Buy/ use the $2 vent tube.
--Wil Ferch
Don't go with "huge" ( size 49) OEM battery. Slightly smaller size 48/91 ( Interstate) works well, can use one of three bottom threaded connections for hold-down for smaller batteries. Buy/ use the $2 vent tube.
--Wil Ferch
10-31-2002, 08:38 PM
#10
Rennlist Member
Speedraser, I forgot to say that Interstate batteries come in several sizes. The one I had in my 88 Carrera was really long, so I replaced it with a shorter one (Interstate MB66). As previously stated, somewhere around $60-$70. The reason I went to the smaller one was it was so difficult to get the battery in and out of the car with the long one. It also was so tight it cracked the blower motor housing in the front in the trunk area. Had to replace it also.
Spider911
88 Carrera
Spider911
88 Carrera
10-31-2002, 08:51 PM
#11
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Hello
Sure your SC has/had a venttube when it left the factory.
It is going trough the wall on the driverside a clear plastic tube like used for the washersystem.
Grüsse
Sure your SC has/had a venttube when it left the factory.
It is going trough the wall on the driverside a clear plastic tube like used for the washersystem.
Grüsse
10-31-2002, 11:58 PM
#12
Three Wheelin'
Thread Starter
Roland,
I looked at all of those tubes -- they all seem to be permanently attached to something at each end already. The owners manual makes no mention of a vent. . .
I looked at all of those tubes -- they all seem to be permanently attached to something at each end already. The owners manual makes no mention of a vent. . .
11-01-2002, 06:18 PM
#13
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mercedes got in trouble with battery expolsions (two) in the c-class. owners replaced the stock vented battery with a wally mart replacement.the concentrated gas went boom. you can get a sonnenschein gel or gma from lauderdale/mg battery. (my dealer won't give you the time of day much less sell you a battery.)
11-02-2002, 12:08 AM
#14
Three Wheelin'
Thread Starter
Well, I decided to spend the money and buy another expensive original Porsche battery that will only last 3 years, but doesn't require a vent. No vapors in the trunk, and the judges will like it whenever I make it to the next show.
Thanks all for your input.
<img src="graemlins/beerchug.gif" border="0" alt="[cheers]" />
Thanks all for your input.
<img src="graemlins/beerchug.gif" border="0" alt="[cheers]" />
11-02-2002, 12:22 PM
#15
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Todd,
Are you sure the Porsche battery doesn't require a vent? I have been using the Porsche batteries for years and they have always come with a vent. At least they should. Look on the ends of the battery. There should be a hole in the middle, along the top, and a ninety degree elbow for attaching the vent hose. As far as I know, Porsche has not switched to any ventless batteries. As a matter of fact, the new Turbo in the showroom had the vent tube attached to the battery.
Are you sure the Porsche battery doesn't require a vent? I have been using the Porsche batteries for years and they have always come with a vent. At least they should. Look on the ends of the battery. There should be a hole in the middle, along the top, and a ninety degree elbow for attaching the vent hose. As far as I know, Porsche has not switched to any ventless batteries. As a matter of fact, the new Turbo in the showroom had the vent tube attached to the battery.