series2 Posted October 2, 2000 Share Posted October 2, 2000 I have a Smiths revcounter in a 1967 Series 2 which reads at least double the engine revs, 8000 rpm for a 1300Xflow is unlikely. I manged to buy an old but brand new boxed Smiths revcounter of the right period but this also overreads by a similar amount. Any ideas for what could cause this. Link to comment Share on other sites More sharing options...
Dave H Posted October 3, 2000 Share Posted October 3, 2000 Mike, I had a similar problem with my Xflow (1987 car - engine lots older). The problem was explained to me as the Rev counter picking up multiple signals from the coil. It was some years ago and all I remember was a number of different configurations of coil/resistor were tried before the whole thing was dumped and an electronic ignition unit installed. (Which solved starting problems as well). I would advise you take it to a good auto electrician who should be able to diagnose your problem. Link to comment Share on other sites More sharing options...
R2D2 Posted October 4, 2000 Share Posted October 4, 2000 The earthing on early cars is poor and all of the instruments use common earths. I would start by using a clean earth directly from the battery and then using a screened cable from the coil. There is a plug in the back of the instrument which hides an adjustment potentiometer and lets the instrument be adjusted but you would need a reference from a master instrument such aa a Crypton or Sun system if you change the calibration in this way. Link to comment Share on other sites More sharing options...
CHRIS CLARK Posted October 4, 2000 Share Posted October 4, 2000 The electronic ignition didn't cure all the starting problems eh Dave? Love to Shazza! Link to comment Share on other sites More sharing options...
James Arnold Posted October 11, 2000 Share Posted October 11, 2000 I had a very similar problem with a 1970 TVR Tuscan V6. The Rev counter showed too many rpm. After spending money on a new Elliot rev counter, I discovered the reason was due to the car having been converted from a ballast resistor ignition system. The rev counter was calibrated to work with a low tension circuit voltage of less than 12volts. When the resistor was removed, the rev counter over-read (and points had a short and sparky life). I have no idea whether a series 2 had ballast resistor ignition when new, but its a ford engine from the same era as my TVR. I believe that ageing rev counters are usually horribly inaccurate, I seem to remember that there are specialists who will put modern movement into the old case. J Link to comment Share on other sites More sharing options...
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