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Smith's Tach settings
Just curious as I may have messed up my Smith's Tach settings as I was messing about under the dash.
My Smith's tach has a 8-6-4 cyl rotary switch on the back. If the switch was disturbed and moved to the 4 cyl setting, would my V8 appear to be running at twice its RPM: Example: the V8 is running at 1000 RPM but the tach says 2000 RPM. Can anyone help? Cheers Greg |
Not sure but have you switched it back to 8 cylinder? Does it work?
Larry |
I'll reset the switch this morning and run the car to confirm.
I researched the info on the net and confirmed my suspitions. A 4 cyl fires twice per revolution and an 8 cyl fires 4 times per rev. So a 4 cyl tach on an 8 cyl engine would read twice the actual engine rpms. Cheers Greg |
Here's a pic of the back of my tach. Rotary dial for three settings: 8-4-6 cyl .
But there are four detents as you rotate the dial - see white markings in pic: http://www.clubcobra.com/photopost/d...mbs/img100.jpg Can anyone tell me which is the correct position for 8cyl? I guess I could do trial and error. Cheers Greg |
I've sent an e-mail to Nosinger hoping they can get me an answer before I start a trial and error process.
Anybody have the answer? Greg |
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