 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
Car Forum / Porsche / Porsche Cars / January 2004HELP: Best battery for 944??
Hi, I just bought a 1984 Porsche 944 back in November. The owner told me that battery needed replacement. So, on the first week of ownership, I purchased a new Interstate Megatron MT-47. This is the recommended interstate battery for the car. This battery has 590 cold cranking amps (CCA). However, the problem is that the vehicle supposedly requires 600 CCA. Today was 3 degrees Fahrenheit outside. When I went to start the car, the battery struggled, but finally started the car. Now, I drive the car every other day at least, so I know it stays charged. Does anyone know of a battery that has more than 600 CCA? In fact, which battery fits this car and hast he most CCA possible? Please help. Thanks in advance. Sincerely, Jon Jon, 590 out of 600? I don't think the battery is your problem. Assuming the alternator and voltage regulator are working properly I would look at all your hi-current connections, such as: your battery terminals, and the starter connections, and the heavy cable that goes from the battery to the starter. Make sure they are all clean and low resistance. Mike > Hi, > [quoted text clipped - 13 lines] > > Jon Mike, Guess what? I tested my alternator yesterday with my passport 8500 radar detector. It has a Voltmeter mode so I can monitor the voltage when I am driving. It says 12.8V at best. When I run the heat full blast, it is 12.3V!!! This is not good news. Perhaps I need a new alternator. However, the starting is only hard when the engine is stone cold. After it has been run and has the littles bit of engine heat, it will start just like my toyota! I don't think the alternator is the problem because the battery is brand new. But the alternator could become a future problem. I'll have to get that fixed. -Jon > Jon, > [quoted text clipped - 25 lines] > > > > Jon If you're only getting 12.8V at best, it's the alternator. Actually I'd guess the regulator which will save you a few bucks. I'd confirm with a real voltmeter or take to an auto part store for a free check. > Mike, > [quoted text clipped - 58 lines] >>> >>>Jon > Mike, > [quoted text clipped - 49 lines] >> > >> > Jon Mine's a little below-par, apparently, too. Seems to be normal for an old alternator.  SignatureRegards, Dave dave_ryman@hotmailNOSPAM.com http://welcome.to/daves.website http://travel.to/formula.one Your car is twenty years old. I'd suspect it ain't just the battery. Check out the electrical connection like the ground at the battery and the ground strap to the engine. > Hi, > [quoted text clipped - 13 lines] > > Jon >This battery has 590 cold cranking amps (CCA). However, the >problem is that the vehicle supposedly requires 600 CCA. There is no effective difference between 590 and 600 when you're talking about a battery rating. Normal production tolerances for capacity can cover 10% of nominal, and you'd never know the difference. Besides that, the rating is valid only at 70F (IIRC) and any given battery will derate over temperature at some factor unique to that particular battery. IOW, a battery rated at 500CCA might possibly have more actual CCA at 0F than another battery rated at 600CCA at 70F (when also at 0F). Depends on how the battery is made, the quality of materials, and condition of the battery. Maybe you need an oil change to that whizzy 0W-40 Mobil 1? Hi, Right now I am using 15W50 Mobile 1. I fear that the car might leak terribly if I use 0W. :) -Jon > >This battery has 590 cold cranking amps (CCA). However, the > >problem is that the vehicle supposedly requires 600 CCA. [quoted text clipped - 10 lines] > > Maybe you need an oil change to that whizzy 0W-40 Mobil 1? CCA specifically refers to cold cranking amps and the spec is 0°F [-17.7°C]. http://www.exideworld.com/faq/faq_auto.html Check your electrical connections to the battery and to the starter. > >This battery has 590 cold cranking amps (CCA). However, the > >problem is that the vehicle supposedly requires 600 CCA. [quoted text clipped - 10 lines] > > Maybe you need an oil change to that whizzy 0W-40 Mobil 1? > CCA specifically refers to cold cranking amps and the spec is 0?F > [-17.7?C]. [quoted text clipped - 17 lines] >> >> Maybe you need an oil change to that whizzy 0W-40 Mobil 1? This seems to confirm my recent experience. I've had a lot of trouble getting my 944 to start. Worsened by the cold, but particularly after the car has not been run for a few days with the alarm enabled. My battery was a 450A affair. I've just replaced it with a 620A battery. Seems to make all the difference. The car has not been left unrun since, so this is not conclusive, but why my mechanic fitted a sub-rate battery, I've no idea. SignatureRegards, Dave dave_ryman@hotmailNOSPAM.com http://welcome.to/daves.website http://travel.to/formula.one >CCA specifically refers to cold cranking amps and the spec is 0°F [-17.7°C]. Yeah... Brain fart. I was thinking about cold cranking, then went on about amp-hour and reserve rating. If cold weather operation is important to a battery buyer, he's much better off buying by CCA rating and ignoring A-H/reserve ratings. |
Reply to this Message |
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2008 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.