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Old 29 May 2015, 09:36   #11
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I've not had any problems like that with the tachs. Just be careful of how many times you wrap the wire around the HT lead, once should do, maybe twice. If you put too many it will break (not sure why, thats the reply I got from tinytach!)
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Old 31 May 2015, 01:24   #12
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I've got one of Chipko's "cheep ones" on my 6hp merc and it works perfectly. It's fitted under the cowl because I only really wanted it for "hours". The wire was cut short, wrapped round the HT lead 4 or 5 times and taped to it. Strangely it had to be set to "firing twice per revolution" to get the correct reading (1300-6000rpm) on a single cylinder 4 stroke. Didn't make sense to me but........if it ain't broke, don't fix it.
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Old 01 June 2015, 06:51   #13
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that could be down to the number of wraps around the HT lead as well
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Old 02 June 2015, 13:22   #14
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Quote:
Originally Posted by Roflhat View Post
that could be down to the number of wraps around the HT lead as well
Wouldn't have though so. The number of turns will only vary the amplitude of the induced pulse and the digital tach won't use a "diode charge pump" type input because it has to be able to cope with different HT voltages from Kettering to electronic.... about 28KV to 40KV+. To be honest I didn't really give it much more thought, the 1300 idle speed was bang on and the rev limiter cut in at 6100 so that was good enough for me. I know some ignition systems fire redundantly at the end of the exhaust stroke just for simplicity but I'm only really looking to record hours so it had as much time spent on it as I was going to give it.
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Old 03 June 2015, 04:37   #15
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sounds like you know much more about than I do! haha
Think somebody on the thundercat forum mentioned the number of wraps could have an effect
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