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Author Topic: tach help 8v71  (Read 995 times)
4106-123
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« on: September 12, 2007, 05:09:13 PM »

im trying to install a tach on my 4106 is a isspro tach i need to know the pulses per revolution on the alternator. i have the signal wire conected to thr relay terminal on the 50dn the guy at isspro said it had to be a ac tap is the relay terminal a ac tap? thanks in advance
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Jerry Liebler
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« Reply #1 on: September 12, 2007, 06:06:57 PM »

The 'r' terminal is the signal you need to get to the tach.  The generator is a 6 pole device and the ratio on your engine is 2.29-1  So you should select 13.74 pulses/rev or whatever is closest to that.
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Jerry 4107 1120
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RTS/Daytona
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Pete RTS/Daytona ->'89 TMC 35' 102" 6V92TA 4:10


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« Reply #2 on: September 12, 2007, 06:14:20 PM »

Note 1 ->For Detroit Diesel Delco gear driven 50DN
            270 Amp 24 volt alternators "R" Terminal hookup
            The "R" terminal output is 12 volt -
            Most 6V92TA's are: (2.93 gears & 6 pulses per Revolution=17.58 pulses/rev)
            Older 6V92's can be(2.75 gears & 6 pulses per revolution=16.5  pulses/rev)
            Older 8V71's can be(2.29 gears & 6 pulses per revolution=13.74 pulses/rev)         
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« Reply #3 on: September 13, 2007, 12:10:19 AM »

I used a pulse generator that was installed on the tach drive off the blower.  Good Luck, TomC
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Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
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