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Old November 25th, 2011, 01:31 PM
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1988 90
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Originally Posted by Antichrist View Post
Bossman, You're confusing the relay circuit with the motor circuit.
You're not going to have a 29amp starter, which is what 360 watts @ 12v is.
The Pontiac PG260 starter has a 1.4kw motor which is a bit over 116amps @ 12v. That's not going to be fused at 40amps.

Volt drop is typically measured per foot and every foot is going to induce voltage drop. It's a measurable increase as the distance increases and/or as the cable size decreases. At 116amps the overall volt drop is .12v for #2 @ 5'. It's .23v at 10'.

I think I ate too much turkey last night.

I stand admittantly corrected.
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Old November 25th, 2011, 07:23 PM
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1998 Defender 110 CSW 300Tdi
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My god, now this is what I call a technical discussion!

For my 300Tdi I have always just tried to put in the biggest CCA battery that I can buy. For New England winters I am sure your 850 CCA will be fine. Having said that I like the sound of that Sears marine battery ...

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Old November 25th, 2011, 09:37 PM
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Bill Adams
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CCAs are a pretty misleading method of judging battery performance/capability. The better numbers to look for are reserve capacity ( in minutes) at the 20 amp rate.
950 CCAs are not much good if you only get 60 seconds of them.
Bill Adams

1966 109 5 door wagon 300Tdi "spermaceti fueled"
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Old November 26th, 2011, 08:36 AM
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Tom Rowe
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In case anyone is interested, this morning someone sent me a test report on their 300Tdi starter which certified it was within spec.
Max current draw was 731amps.
Median current draw was 457amps.
Tom Rowe
Atlanta, GA

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