Tacho surge?
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Thread: Tacho surge?

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    Off the Xmas card list kapri's Avatar
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    Tacho surge?

    What would make a tacho surge ? I've fited an electronic dizzy, ticks over fine, no misfires etc but the tacho will remain steady and then either when depressing the throttle or juss by itself the needle will surge upwards before dropping back ? Downwards I could understand as a loss of power / lose connection but upwards ?

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    Official RnS Addict Magman's Avatar
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    Are you taking the tacho pic up from the coil negative?

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    Off the Xmas card list kapri's Avatar
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    Yes, as per the contacts dizzy .I've just swapped back to the points and the surge is gone ?

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    Official RnS Addict Magman's Avatar
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    It sounds like the rev counter is picking up a back feed from the electronic ignition somehow.

    I've seen hall effect electronic ignition send odd signals before but not enough to power a rev counter like yours has???

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    Dragging not Bragging vince-305's Avatar
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    My monster tach goes right off the clock when i turn my ign off but only since i wired the elec fan to an ign live

    The engine runs on for a couple of seconds too
    Bit'z 'N' Piece's
    Ford consul mk2 chevy powered highrider

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    Off the Xmas card list kapri's Avatar
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    Found it !! It's Bosch unit with 4 downward hanging tangs and when I was checking the bearings noticed that 1 was at a (very) slightly different angle. I adjusted the air gap on the straight ones and confirmed that was the problem. Straightened it up and refitted ..purrfick
    Last edited by kapri; 17-11-2009 at 07:35.

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    Exceeded sell by date Plumpcars's Avatar
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    Interesting. During the problems with my ignition my tacho would shoot up Kev.
    Finally switched over to MSD yesterday(I know Johnny will not approve!) and all is well with the world.

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    Off the Xmas card list kapri's Avatar
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    Might be worth close inspection now it's out Steve ?

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