peterparsons
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| posted on 9/9/08 at 10:49 AM |
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smiths tach reading 6000 rpm at tick over !
Hi all
Electrics are not my strong point - any ideas welcome.
I've wired up my tacho as per the diagram, when I start the engine (pinto) the tacho reads approx 6000-7000 rpm on tick over.
The gauge is from a cortina - smiths RVI 2413/co - 4cyl neg earth
reads zero with ignition on and engine not running
no elec ignition - using points
[Edited on 9/9/08 by peterparsons]
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Mr Whippy
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| posted on 9/9/08 at 10:52 AM |
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hmm is there a switch for selecting the number of cyclinders?
Fame is when your old car is plastered all over the internet
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MikeRJ
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| posted on 9/9/08 at 10:54 AM |
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The RVI tacho's are generally not compatible with electronic ignition (other than very basic "transistor assisted" types). Does
your Pinto have points?
Is is correctly reading 0 RPM with just the igntion on but engine not running?
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MikeRJ
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| posted on 9/9/08 at 10:56 AM |
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quote:
Originally posted by Mr Whippy
hmm is there a switch for selecting the number of cyclinders?
Not on something of this vintage! The Smiths RVI tachos were never sold as 'universal' aftermarket parts AFAIK, and they've been
out of production for many years.
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Mr Whippy
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| posted on 9/9/08 at 11:00 AM |
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hmm its a pinto anyway, never broke one yet from thrashing it
Fame is when your old car is plastered all over the internet
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peterparsons
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| posted on 9/9/08 at 11:02 AM |
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no, not switchable - 4 cylinder neg earth
yes reads zero with ign on and engine not running
no elec ign - using points
[Edited on 9/9/08 by peterparsons]
[Edited on 9/9/08 by peterparsons]
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Mr Whippy
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| posted on 9/9/08 at 11:46 AM |
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loose connection then maybe, is the needle steady or flickering about? if it is then I'd suspect that might me the cause, otherwise not sure, is
it one of those wrap round a lead type or just connected to the + wire for the points?
Fame is when your old car is plastered all over the internet
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Peteff
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| posted on 9/9/08 at 12:09 PM |
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Does the tickover sound fast, like a F1 car maybe  Does it read from the coil + ?
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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02GF74
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| posted on 9/9/08 at 01:12 PM |
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what diagram?
can you post photo of rear of speedo?
the RV1 smiths came in different flavours -t he very early ones use the loop of wire connected to coil as a primary for the internal transformer;
later ones take a wire from the + of the coil.
If you are running points, then are you sure the condenser is fitted and working?
It does sound like you are getting too many pulses, about 10 x.
Do you know if the rev counter is working?
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Mr Whippy
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| posted on 9/9/08 at 02:13 PM |
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so how much do you want for this apparently super tuned pinto?
Fame is when your old car is plastered all over the internet
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Macbeast
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| posted on 9/9/08 at 04:14 PM |
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Does it read higher (even higher) when you rev ? If so it's sort of working. I'll have to check with one on my bench but I have a feeling
there is a calibration pot but don't touch it yet (unless you already have ). It sounds as if there is an earth off, either in the external
connections or internally.
There should be 4 connections - sense loop in, sense loop out, Ign +ve and earth -ve. Don't assume that connecting the instrument case to earth
will do it - you need a solid connection to the -ve terminal.
[Edited on 9/9/08 by Macbeast]
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peterparsons
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| posted on 9/9/08 at 10:14 PM |
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NO CHANGE TO THE GAUGE IF i REV THE ENGINE !
JUST READS CONSTANT
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