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The Terminator
Terminator Talk
Start 'N Charge alternators 03-04 only please!
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<blockquote data-quote="Tractionless1" data-source="post: 11295735" data-attributes="member: 59392"><p>I have one of the orginal half dozen Jamie reported had rotor problems. While I never experienced the problem myself, Jamie sent me a new rotor which I had installed locally. I did this at my request as it was during the time Jamie was down with his shop fire. Still no problems with mine which is running a 4" pulley with 8lb. lower, I'll be keeping the same pulley when I switch to 6lb. per the calculation below...........</p><p></p><p><em>The math is quite easy. If I have a 3.2 alternator pulley and a 7.5 crank pulley then you </em></p><p><em>divide 7.5 by 2.5 and you get about 2.1. Multiply 2.1 by your engine idle speed, say 800 </em></p><p><em>rpms, and you get 1680. My alternator turns at 1,680 rpms when the car is idleing at 800. So now take your 4# lower which is an 8.5 pulley and divide that by your 3.2 alternator pulley and you get 2.65. So 800 multiplied by 2.6 is 2,080 rpms for your alternator at an 800 rpm engine idle. </em></p><p>As a prequel to the above it is said the alternator starts producting voltage around 1200rpm (alt. shaft speed not idle rpm).</p></blockquote><p></p>
[QUOTE="Tractionless1, post: 11295735, member: 59392"] I have one of the orginal half dozen Jamie reported had rotor problems. While I never experienced the problem myself, Jamie sent me a new rotor which I had installed locally. I did this at my request as it was during the time Jamie was down with his shop fire. Still no problems with mine which is running a 4" pulley with 8lb. lower, I'll be keeping the same pulley when I switch to 6lb. per the calculation below........... [I]The math is quite easy. If I have a 3.2 alternator pulley and a 7.5 crank pulley then you divide 7.5 by 2.5 and you get about 2.1. Multiply 2.1 by your engine idle speed, say 800 rpms, and you get 1680. My alternator turns at 1,680 rpms when the car is idleing at 800. So now take your 4# lower which is an 8.5 pulley and divide that by your 3.2 alternator pulley and you get 2.65. So 800 multiplied by 2.6 is 2,080 rpms for your alternator at an 800 rpm engine idle. [/I] As a prequel to the above it is said the alternator starts producting voltage around 1200rpm (alt. shaft speed not idle rpm). [/QUOTE]
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Start 'N Charge alternators 03-04 only please!
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