Mk2 Cortina Rev Counter

[Guest Ken Brough]

i am currently installing mk2 cortina gt clocks, however when i connect up the rev counter it reads approximatley double the actual revs. I have connected the live from the coil through the rev counter then back to the coil. Ignition live to the rear spade and then earthed the pole. Any idea's.

[Longboarder]

Usualy take any handy ignition live and earth from behind the dash to power it and a lead from the coil neg to the rev counter to provide the signal for it to read.

 

Nigel

[Guest Ken Brough]

Thanks Nigel I will give that a try.

[Guest Gpayne]

ken when you get it sorted will you bring the details to the meeting on thursday next and any other details on wiring the other clocks cheers mate graham

[Guest edders]

the problem is that the cortina clocks use something called wasted spark signalling which means it needs half as many signals being sent to the clocks as there is there is a way to remedy this because i encountere the same problem fitting a set of fiesta rs1800 revcounter clocks to a standard fiesta it gave twice as many revs as was needed

[Longboarder]

I would have thought wasted sparks and cortina don't go together. In those days any wasted sparks and you ground to a halt!

 

Nigel

[chris27]

Hi kenny

 

give JDO instruments a call. He was very helpfull with mine

 

http://www.jdo1.com/index.html

[Guest Gpayne]

kenny i think ive got mine working alright .what you have done sounds right but the flow from the coil must go in the right direction try swaping the wires around on the coil if this doesnt help go to the web site chris has put up click on rev counters and in the phrase "a wiring diagram is sent " click on diagram and as if by magic one will appear check weather your clock is negative or positive and read the conections of the first diagram.

cheers graham

[Guest Ken Brough]

Thanks Graham, i will give them a try at the weekend. Might have a rev counter for Monday.

[Longboarder]

If it's wired up correctly it should be OK. It may not be able to cope with the higher power of the sierra ignition and be picking up stray signals. I had a problem with a VDO rev counter which required a diode to sort.

Had a similar problem with my VDO rev counter picking up false signals and lying to me. VDO said fit a 1n4001 diode in line (in series) between the coil neg and the rev counter. Its a piddly little thing from Maplins and costs pennies but it works. Can't remember which way round it goes but if you solder it in and it doesn't work just unsolder and turn it round

Just another possibility. May help.

 

Nigel

[Longboarder]

Here is a link to a similar problem on locostbuilders.

Link with possible solutions.

 

Nigel