Rev counter

[Ianrhall]

Is it possible to use my cortina rev counter with my rv8?
Thanks
Ian

[DaveEFI]

Is it a mechanical or electronic type?

[Ianrhall]

Electronic

Ian

[stevieturbo]

What age is the cortina, and what ignition system do you have ?

I had no issues using my MK2 Granada rev counter with the RV8.

Obviously it will offer a different reading, but that can be worked with to a degree by a few methods.

But in general, the coil negative/trigger should just work the rev counter without issue

For making it read correctly...

There may be an adjustable pot inside the rev counter itself that can be used to adjust it.
You may need to wire in an external pot to the actual swing meter coil which will give you adjustment

or you can buy a pulse adjuster type device and use that instead.

[Ianrhall]

It's a mk1 cortina. As far as I can make out the gauge will read double the true reading, just!!!need to add a resistor to correct the reading

Ian

[stevieturbo]

It's a mk1 cortina. As far as I can make out the gauge will read double the true reading, just!!!need to add a resistor to correct the reading

Ian

The resistor will be internal though. Not external.

But as said, there may already be an adjustable pot inside the clocks. I think it was my earlier clocks that had this, the later ones didnt.

[DaveEFI]

If all else fails, it's possible to change the electronics inside the unit to a more modern circuit. Useful if it needs to be driven off an ECU rather than coil. Plenty of info via Google. Did just this with my SD1.

[stevieturbo]

Shouldnt need to change anything inside it.

Ive driven my Granada rev counter off the original RV8 ignition amp, crane Hi6, The RV8 dizzy via a Ford ignition amp, and then finally from my DTA ecu.

And now just fire my Hayabusa clocks off my ecu.

Went through several setups over the years from carb/dizzy days, to more recent years.

[DEVONMAN]

Mk 1 Cortina was +ve earth aand I think the rev counter had an external loop at the rear taking an inductive pulse on the feed to the live side of the coil.

If the rev counter is for a positive earth car then you will need to swop the internal Positive and negative leads to the circuit board.

[DaveEFI]

Shouldnt need to change anything inside it.

Ive driven my Granada rev counter off the original RV8 ignition amp, crane Hi6, The RV8 dizzy via a Ford ignition amp, and then finally from my DTA ecu.

And now just fire my Hayabusa clocks off my ecu.

Went through several setups over the years from carb/dizzy days, to more recent years.

It will depend on the original design of the thing. They are not all the same.