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Factory Tach problem |
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JimW 
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Joined: 09-December-2003 Location: USA Status: Offline Points: 604 |
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 Topic: Factory Tach problemPosted: 11-January-2008 at 10:34AM |
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tried hooking it up as prescribed (in line with the power wire to the coil) and at a 1000 rpm idle it sits at 3000 rpm... It swings around almost normally when revving (right to 6000 when revving to 3000 rpm).
Any thoughts? (especially how to fix)
Crane HI6 ignition with PS92 coil and MSD billet dizzy...
TIA,
Jim
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1976 S&H Gran Torino
460/C6/4.33 13.05@105.6 545/C6/3.56 11.52@117.8 460/T56/4.00 cruiser www.torinocobra.com www.starskytorino.com https://www.hotrod.com/features/0702phr-1971-ford-gran-torino/ |
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Flipvs
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Joined: 19-December-2007 Location: The Netherlands Status: Offline Points: 33 |
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Posted: 13-January-2008 at 7:37AM |
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Jim,
I don't know the Crane ignition, but like more electronic ignitions it could be that the Crane fires more than one time on a single pulse. In this case there's not much you can easily do . There is a way though, and that is to use an optical or magnetic sensor on the crancshaft pulley, and generate (with an electronic booster) a current pulse of about 1 Amp. trough the factory tach. That should do the job. Maybe you could first test the tach (to be sure it's working) with a small transformer, outputcurrent 1 Amp. , voltage not very important, a single rectifier diode. At 60 Hz it would result in a tacho reading of 3600/8=450 rpm. If you need a schematic diagram of the test setup, I'm glad to help you. Flip. ps Are you sure the tach is originally for an eight cyl. engine? Edited by Flipvs - 13-January-2008 at 10:54AM |
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Gran Torino'73 Wagon, 351c, Goldglow, sportsmirrors, sportscluster, cold airc., Bi-fuel: Petrol+Propane(LPG), Pertronix ignitor1, 2 Oxygen Sensors and a daily driver !
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Psquare75
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Member of the Stroker Club Joined: 26-November-2005 Location: United States Status: Offline Points: 4591 |
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Posted: 13-January-2008 at 11:42AM |
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I'm scratching my head.. sell the crane and go MSD :) Actually, what year is your cluster? 74 or older?
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Paul
77 XR7 460/C6/3.00:1 *SOLD* 78 XR7 523/C6/3.5:1 79 F100 460/TKO500/3.25:1 'I also have some left over potatoes-I understand you can generate electricity from them'- Foote500 |
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JimW
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Joined: 09-December-2003 Location: USA Status: Offline Points: 604 |
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Posted: 13-January-2008 at 4:38PM |
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The tach actually came out of a 1974 Torino (351C), would that be the problem? IIRC they had points and a resistor in the wire..
FWIW, I will never put another MSD on the car, three is enough..
I have access to two 1976 tachs, worth trying them?
Jim
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1976 S&H Gran Torino
460/C6/4.33 13.05@105.6 545/C6/3.56 11.52@117.8 460/T56/4.00 cruiser www.torinocobra.com www.starskytorino.com https://www.hotrod.com/features/0702phr-1971-ford-gran-torino/ |
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Flipvs
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Joined: 19-December-2007 Location: The Netherlands Status: Offline Points: 33 |
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Posted: 14-January-2008 at 12:34AM |
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If it comes out a '74 351, that's ok. Or your tach isn't working properly, or the ignition is causing the problem. Trying the other tach is always an option. At least you will be sure about the status of the one you're using at the moment. ps Have you any idea of the current flow through the coil ? It could be that it's much too high for the tach. In that case there would be a simple solution, of shunting the tach with a resistor. Maybe you can measure the current flow, I can compare it with my tach-current. Maybe that could give the solution to the problem. Flip. |
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Gran Torino'73 Wagon, 351c, Goldglow, sportsmirrors, sportscluster, cold airc., Bi-fuel: Petrol+Propane(LPG), Pertronix ignitor1, 2 Oxygen Sensors and a daily driver !
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JimW
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Joined: 09-December-2003 Location: USA Status: Offline Points: 604 |
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Posted: 14-January-2008 at 1:53PM |
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Current as in amps?
Jim
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1976 S&H Gran Torino
460/C6/4.33 13.05@105.6 545/C6/3.56 11.52@117.8 460/T56/4.00 cruiser www.torinocobra.com www.starskytorino.com https://www.hotrod.com/features/0702phr-1971-ford-gran-torino/ |
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Flipvs
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Posted: 15-January-2008 at 9:45AM |
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Yes, electric current. Measure it in one of the coil-leads. (about 3 to 7 amps I guess) Flip |
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Gran Torino'73 Wagon, 351c, Goldglow, sportsmirrors, sportscluster, cold airc., Bi-fuel: Petrol+Propane(LPG), Pertronix ignitor1, 2 Oxygen Sensors and a daily driver !
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JimW
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Joined: 09-December-2003 Location: USA Status: Offline Points: 604 |
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Posted: 15-January-2008 at 11:21AM |
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Ok, I will give that a shot and report the results..
Thanks!
Jim
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1976 S&H Gran Torino
460/C6/4.33 13.05@105.6 545/C6/3.56 11.52@117.8 460/T56/4.00 cruiser www.torinocobra.com www.starskytorino.com https://www.hotrod.com/features/0702phr-1971-ford-gran-torino/ |
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