7 replies to this topic

[Coxie]

I need to get a tacho fitted to the mini but I'm a bit unsure of what will work with my set up.
I'm running lumenition optronic ignition so it's a lower voltage.
What will work with this set up?

[Guess-Works.com]

any modern tacho which runs of a pulse on the -ve terminal of the coil.

[Coxie]

any modern tacho which runs of a pulse on the -ve terminal of the coil.

So this smiths rvc impulse tacho should be all good then?  image.jpg   53.38K   3 downloads

[dklawson]

 

So this smiths rvc impulse tacho should be all good then?

 

 

Yes.   However, the RVC tachs are not considered or called impulse tachs.  The RVC tachs are voltage pulse sensing units.  It is the older RVI tachs which sense current pulses that are called "impulse" and generally they do not work with electronic ignitions.

 

If the RVC tach you have is operational it should have no problem with your Lumenition ignition.  Connect the tach's sense terminal to the coil (-) terminal (distributor wire connection) and make the normal power and earth connections and it should work.  

[Coxie]

So this smiths rvc impulse tacho should be all good then?

 
Yes.   However, the RVC tachs are not considered or called impulse tachs.  The RVC tachs are voltage pulse sensing units.  It is the older RVI tachs which sense current pulses that are called "impulse" and generally they do not work with electronic ignitions.
 
If the RVC tach you have is operational it should have no problem with your Lumenition ignition.  Connect the tach's sense terminal to the coil (-) terminal (distributor wire connection) and make the normal power and earth connections and it should work.

This is the box of the one I was looking at and where I got the impulse part from.  image.jpg   21.76K   7 downloads

[dklawson]

I see.  While I cannot argue with the label on the box, if you were to start asking for help with your impulse tachometer it would be confusing to those who try and respond.  

 

On a similar note, some A- and B-series engines from the late 1970s were outfitted with an emissions component called a "gulp valve".  There are many boxes of Smiths PCV valves which are mislabeled as gulp valves.  While both the PCV valve and gulp valve are emissions components, they are very different and the mislabeling by Smiths created confusion.

[Coxie]

Thanks for your help DK
As it turns out I dropped my coil yesterday and it started leaking oil. Spoke to lumenition and gave them my module part number then found out that my lumenition kit is actually the performance constant energy coil 12v model.
Silly old me has been running it ballast resisted for the past 6 months.
Surprised it worked actually.

[dklawson]

Thanks for your help DK
As it turns out I dropped my coil yesterday and it started leaking oil. Spoke to lumenition and gave them my module part number then found out that my lumenition kit is actually the performance constant energy coil 12v model.
Silly old me has been running it ballast resisted for the past 6 months.
Surprised it worked actually.

 

Sorry.  At least you found out and can bypass the resistor now.   12V coil, 12V supply (without resistor), Lumenition module, and you'll have a very reliable ignition system.