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RBD240
08-30-2009, 04:30 PM
Looking at Optima batterys for my 240sx swapped with a rb20det, was wondering if anyone knows what the CCA are supposed to be for that engine. the lowest the have in yellow top is 450cca.

Thanks
projectRDM
08-31-2009, 07:50 AM
Why do you want a lower rated battery? And why do you think swapping an engine matters to the size of the battery?

CCA = cold cranking amps. For any application you want a higher rated battery for more capacity and increased handling of electrical loads. If the battery will fit around IC piping or whatever you've done under the hood, go for at least 650CCA. You can get away with less, but why?
g6civcx
08-31-2009, 09:50 AM
Get the biggest yellow top that fits.
sr240noob
08-31-2009, 10:22 AM
autozone has 800cca and 100ca for 149.99 on optimas. i just bought one. amazing battery. I worked on the car for 3 hrs while listening to radio and the car fired perfictly after. no need to charge!
g6civcx
08-31-2009, 10:26 AM
autozone has 800cca and 100ca

Does this sound crazy to anyone? CCA is usually lower than regular CA.