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<p>Bob.</p>
<p> Another item you didn't consider are the contacts in the battery disconnect switch. I know with mine I have to sometimes fiddle around with it to make good enough contact to run the starter well. Don't know if the current available replacements are satisfactory.</p>
<p>Regards,</p>
<p> Gordy </p>
<p>Longbridge BN4, with left side door lock</p>
<p>On 2018-05-15 10:30, Bob Spidell wrote:</p>
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<p>There's several variables to consider:</p>
<p>- Later 6-cyl cars have the battery in the boot. That's a long cable run to the starter solenoid; the cables and terminals need to be in good nick. </p>
<p>- Ditto the starter. The field coils in starters build up resistance over time and, eventually, the starter won't crank as well, putting even more load on the battery. After a couple cranks, the field coils get warm and the resistance builds up and, of course, the battery's reserve gets depleted.</p>
<p>- The higher the compression in your engine, the harder it is to turn over.</p>
<p>- Thicker oil, like 20W-50 can bog an engine down a bit.</p>
<p>The more CCA you have, the more margin to start an engine, esp. on a cold day (that's why CCA is the nominal stat for batteries). My Healeys are harder to start after they've been sitting for more than a few days. The 500CCA number I gave was a SWAG; I haven't seen any full-size auto battery with less than that anyway. We got a battery for my dad's '65 Mustang 289 with 550CCA from Autozone; Costco didn't sell the size we needed. It cranks the V8 OK.</p>
<p>FWIW, when I rebuilt my BJ8's engine the (previously) satisfactory wet cell battery I had wouldn't even turn the engine over (later compression checks showed 180PSI +/- in all 6). I had the starter rebuilt and installed an 800CCA AGM battery. The starter actually startled me the first time I cranked it; it's nearly as fast as the geared starter in my Mustang.</p>
<p>TLDR; The more the better.</p>
<p>Bob</p>
<div class="moz-cite-prefix">On 5/14/2018 10:12 PM, John Spaur wrote:</div>
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<p class="MsoNormal">So... wise ones (and I mean that sincerely)<!-- o ignored --></p>
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<p class="MsoNormal">My current battery is an Intimidator rated at 775. Bob S. mentioned in a post about a minimum of 500.<!-- o ignored --></p>
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<p class="MsoNormal">How many CCA's should a battery have for a Healey engine?<!-- o ignored --></p>
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<p class="MsoNormal">TIA<!-- o ignored --></p>
<p class="MsoNormal">John Spaur<!-- o ignored --></p>
<p class="MsoNormal">San Jose<!-- o ignored --></p>
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